[Event "Sofia MGU op 212th"]
[Site "Sofia"]
[Date "2018.04.29"]
[Round "4"]
[White "Dimova, Mariya"]
[Black "Kostov, Nikolai"]
[Result "0-1"]
[ECO "C50"]
[WhiteElo "1434"]
[BlackElo "1631"]
[PlyCount "68"]
[EventDate "2018.04.28"]
[EventType "swiss"]
[EventRounds "6"]
[EventCountry "BUL"]
[SourceTitle "CBM 184 Extra"]
[Source "ChessBase"]
[SourceDate "2018.06.28"]
[SourceVersion "1"]
[SourceVersionDate "2018.06.28"]
[SourceQuality "1"]

1. e4 e5 2. Nf3 Nc6 3. c3 d6 4. Bc4 Be6 5. Bd3 h6 6. Bc2 d5 7. d4 exd4 8. Nxd4 Nxd4 9. Qxd4 dxe4 10. Qxe4 Qd5 11. Qxd5 Bxd5 12. 0-0 0-0-0 13. Be3 Bc4 14. Re1 Kb8 15. Nd2 Be6 16. b4 Nf6 17. a4 Nd5 18. c4 Nxe3 19. Rxe3 Rxd2 20. Bb3 Bxb4 21. h3 Bc5 22. Rf3 Rhd8 23. a5 a6 24. Ba4 R8d3 25. Rxd3 Rxd3 26. Rb1 Rd2 27. Bc6 b6 28. axb6 cxb6 29. Kh1 Kc7 30. Bf3 Rxf2 31. Rd1 Bxh3 32. Rd5 Be6 33. Re5 Rf1+ 34. Kh2 Bd6 0-1

[Event "Sofia MGU op 212th"]
[Site "Sofia"]
[Date "2018.04.29"]
[Round "5"]
[White "Kostov, Nikolay St"]
[Black "Kostov, Nikolai"]
[Result "0-1"]
[ECO "C02"]
[WhiteElo "1325"]
[BlackElo "1631"]
[PlyCount "68"]
[EventDate "2018.04.28"]
[EventType "swiss"]
[EventRounds "6"]
[EventCountry "BUL"]
[SourceTitle "CBM 184 Extra"]
[Source "ChessBase"]
[SourceDate "2018.06.28"]
[SourceVersion "1"]
[SourceVersionDate "2018.06.28"]
[SourceQuality "1"]

1. e4 e6 2. d4 d5 3. e5 c5 4. c4 cxd4 5. Qxd4 Nc6 6. Qd2 Bb4 7. Nc3 d4 8. Nge2 dxc3 9. Nxc3 Nxe5 10. Qxd8+ Kxd8 11. Bf4 Bxc3+ 12. bxc3 Ng6 13. 0-0-0+ Bd7 14. Bd6 Nf6 15. f3 h5 16. h4 Rc8 17. c5 a6 18. Kb2 Ne8 19. g4 Nxd6 20. gxh5 Rxh5 21. cxd6 Rhc5 22. c4 Ne5 23. h5 Ba4 24. Rb1 Nxf3 25. Ka3 Bc6 26. Rg1 Nxg1 27. Bd3 Nf3 28. Rf1 Ra5+ 29. Kb2 Rxh5 30. Be2 Rh2 31. Rd1 Rxe2+ 32. Kc1 Be4 33. Rh1 Rxc4+ 34. Kd1 Rd2# 0-1

[Event "Sofia MGU op 212th"]
[Site "Sofia"]
[Date "2018.04.28"]
[Round "1"]
[White "Kostov, Nikolai"]
[Black "Banov, Encho Denev"]
[Result "1-0"]
[ECO "E20"]
[WhiteElo "1631"]
[BlackElo "1332"]
[PlyCount "39"]
[EventDate "2018.04.28"]
[EventType "swiss"]
[EventRounds "6"]
[EventCountry "BUL"]
[SourceTitle "CBM 184 Extra"]
[Source "ChessBase"]
[SourceDate "2018.06.28"]
[SourceVersion "1"]
[SourceVersionDate "2018.06.28"]
[SourceQuality "1"]

1. d4 e6 2. c4 Nf6 3. Nf3 Be7 4. Nc3 0-0 5. e3 d6 6. Bd3 Nbd7 7. Qc2 g6 8. h4 Nh5 9. g4 Ng7 10. h5 Nf6 11. hxg6 fxg6 12. Nh2 d5 13. Bd2 c6 14. 0-0-0 c5 15. f4 a6 16. g5 Nfh5 17. cxd5 Nf5 18. Nf3 exd5 19. Nxd5 Qxd5 20. Bc4 1-0

[Event "Sofia MGU rapid 7th"]
[Site "Sofia"]
[Date "2018.03.25"]
[Round "1"]
[White "Babatov, Martin"]
[Black "Kostov, Nikolai"]
[Result "1-0"]
[ECO "D02"]
[WhiteElo "1619"]
[BlackElo "1631"]
[PlyCount "101"]
[EventDate "2018.03.25"]
[EventType "swiss (rapid)"]
[EventRounds "8"]
[EventCountry "BUL"]
[SourceTitle "CBM 183 Extra"]
[Source "ChessBase"]
[SourceDate "2018.04.19"]
[SourceVersion "1"]
[SourceVersionDate "2018.04.19"]
[SourceQuality "1"]

1. d4 d5 2. Bf4 Nc6 3. e3 Nf6 4. Nf3 Bg4 5. Be2 e6 6. h3 Bf5 7. a3 Bd6 8. Bxd6 Qxd6 9. Nbd2 0-0 10. 0-0 Ne4 11. Nxe4 Bxe4 12. c4 Na5 13. c5 Qc6 14. b4 Nc4 15. Bxc4 dxc4 16. Ne5 Qd5 17. f3 Bd3 18. Nxd3 cxd3 19. Qxd3 e5 20. Rfd1 Rad8 21. Rac1 Rd7 22. Qc4 Qxc4 23. Rxc4 Rfd8 24. c6 bxc6 25. Rxc6 exd4 26. Rxd4 Rxd4 27. exd4 Kf8 28. Rxc7 Rxd4 29. Rxa7 g6 30. b5 Ke8 31. b6 Rd7 32. Rxd7 Kxd7 33. a4 Kc6 34. a5 Kb7 35. Kf2 Ka6 36. Ke3 f6 37. g4 h6 38. h4 Kb7 39. f4 Kc6 40. g5 hxg5 41. hxg5 f5 42. Kd4 Kd6 43. b7 Kc7 44. a6 Kb8 45. Ke5 Ka7 46. Kf6 Kxa6 47. b8Q Ka5 48. Ke5 Ka6 49. Kd5 Ka5 50. Kc5 Ka4 51. Qb4# 1-0

[Event "Sofia MGU rapid 7th"]
[Site "Sofia"]
[Date "2018.03.25"]
[Round "2"]
[White "Kostov, Nikolai"]
[Black "Ferdov, Stavri"]
[Result "0-1"]
[ECO "B10"]
[WhiteElo "1631"]
[BlackElo "1740"]
[PlyCount "100"]
[EventDate "2018.03.25"]
[EventType "swiss (rapid)"]
[EventRounds "8"]
[EventCountry "BUL"]
[SourceTitle "CBM 183 Extra"]
[Source "ChessBase"]
[SourceDate "2018.04.19"]
[SourceVersion "1"]
[SourceVersionDate "2018.04.19"]
[SourceQuality "1"]

1. e4 c6 2. Bc4 d5 3. exd5 cxd5 4. Bb3 Nc6 5. Nf3 Nf6 6. 0-0 Bg4 7. h3 Bh5 8. d4 e6 9. Bg5 Be7 10. Re1 Bxf3 11. Qxf3 Nxd4 12. Ba4+ b5 13. Qd3 0-0 14. Qxd4 bxa4 15. Qxa4 Qb6 16. b3 Ne4 17. Rxe4 Bxg5 18. Re2 Bf6 19. c3 Rac8 20. Nd2 Bxc3 21. Rb1 Rc7 22. Nf3 Rfc8 23. Qf4 Bf6 24. g4 Qb5 25. Re3 Rc1+ 26. Rxc1 Rxc1+ 27. Re1 Rxe1+ 28. Nxe1 h6 29. Qc7 a5 30. Qc8+ Kh7 31. Qc2+ g6 32. Kg2 Bg7 33. h4 Qb4 34. h5 Qxg4+ 35. Kf1 Qxh5 36. Qc5 Qh1+ 37. Ke2 Qe4+ 38. Kd1 Qb1+ 39. Ke2 Qxa2+ 40. Qc2 Qxc2+ 41. Nxc2 h5 42. Nd4 Bxd4 43. b4 axb4 44. f4 b3 45. f5 b2 46. Kd2 b1Q 47. Ke2 gxf5 48. Kf3 e5 49. Ke2 h4 50. Kf3 Qe4# 0-1

[Event "Sofia MGU rapid 7th"]
[Site "Sofia"]
[Date "2018.03.25"]
[Round "5"]
[White "Tenev, Bogdan"]
[Black "Kostov, Nikolai"]
[Result "1-0"]
[ECO "D03"]
[WhiteElo "1429"]
[BlackElo "1631"]
[PlyCount "139"]
[EventDate "2018.03.25"]
[EventType "swiss (rapid)"]
[EventRounds "8"]
[EventCountry "BUL"]
[SourceTitle "CBM 183 Extra"]
[Source "ChessBase"]
[SourceDate "2018.04.19"]
[SourceVersion "1"]
[SourceVersionDate "2018.04.19"]
[SourceQuality "1"]

1. d4 d5 2. Nc3 Nf6 3. Bg5 e6 4. Nf3 h6 5. Bxf6 Qxf6 6. g3 Bb4 7. Qd3 0-0 8. a3 Ba5 9. Bg2 Nc6 10. 0-0 Bb6 11. e3 Re8 12. Rfe1 Ne7 13. Rad1 c6 14. e4 Ng6 15. exd5 cxd5 16. Nxd5 Qd8 17. Nxb6 Qxb6 18. b4 Bd7 19. c4 a5 20. b5 Qd6 21. Ne5 Nxe5 22. dxe5 Qxd3 23. Rxd3 Rad8 24. Bxb7 Bc8 25. Rxd8 Rxd8 26. Bxc8 Rxc8 27. b6 Kf8 28. Rc1 Ke7 29. c5 Kd7 30. b7 Rb8 31. c6+ Kc7 32. f4 Rd8 33. Rb1 Rb8 34. Rc1 Rd8 35. Kf2 f6 36. Ke2 fxe5 37. fxe5 Rd5 38. Rb1 Rxe5+ 39. Kf3 Rf5+ 40. Ke4 Rf8 41. Ke5 Re8 42. b8Q+ Rxb8 43. Rxb8 Kxb8 44. Kxe6 Kc7 45. Kd5 a4 46. g4 g6 47. h4 Kc8 48. Kd6 h5 49. g5 Kd8 50. Ke6 Kc7 51. Kf6 Kxc6 52. Kxg6 Kc5 53. Kxh5 Kc4 54. g6 Kb3 55. g7 Kxa3 56. g8Q Kb4 57. Qa2 a3 58. Kg5 Ka4 59. Kf4 Kb4 60. Ke4 Ka4 61. Kd4 Kb4 62. h5 Ka4 63. Kc4 Ka5 64. Qxa3+ Kb6 65. Qc5+ Kb7 66. Qd6 Ka8 67. Qd7 Kb8 68. Kb5 Ka8 69. Kb6 Kb8 70. Qb7# 1-0

[Event "Sofia Gerenski Memorial 11th"]
[Site "Sofia"]
[Date "2018.03.23"]
[Round "4"]
[White "Kostov, Nikolai"]
[Black "Arnaudov, Petar"]
[Result "0-1"]
[ECO "A45"]
[WhiteElo "1631"]
[BlackElo "2008"]
[PlyCount "44"]
[EventDate "2018.03.21"]
[EventType "swiss"]
[EventRounds "7"]
[EventCountry "BUL"]
[SourceTitle "CBM 183 Extra"]
[Source "ChessBase"]
[SourceDate "2018.04.19"]
[SourceVersion "1"]
[SourceVersionDate "2018.04.19"]
[SourceQuality "1"]

1. d4 Nf6 2. Nd2 c5 3. dxc5 Qa5 4. Ngf3 Nc6 5. c3 Qxc5 6. Nb3 Qb6 7. h3 e5 8. Be3 Qc7 9. g3 a5 10. Bg2 a4 11. Nc1 d5 12. 0-0 Be7 13. Bg5 Be6 14. Be3 h6 15. Re1 g5 16. h4 Ng4 17. Bd2 e4 18. Nd4 Nxd4 19. cxd4 e3 20. Bxe3 Nxe3 21. fxe3 Qxg3 22. Qd2 Bh3 0-1

[Event "Sofia Gerenski Memorial 11th"]
[Site "Sofia"]
[Date "2018.03.22"]
[Round "2"]
[White "Kostov, Nikolai"]
[Black "Dragiev, Drago"]
[Result "0-1"]
[ECO "D94"]
[WhiteElo "1631"]
[BlackElo "1955"]
[PlyCount "76"]
[EventDate "2018.03.21"]
[EventType "swiss"]
[EventRounds "7"]
[EventCountry "BUL"]
[SourceTitle "CBM 183 Extra"]
[Source "ChessBase"]
[SourceDate "2018.04.19"]
[SourceVersion "1"]
[SourceVersionDate "2018.04.19"]
[SourceQuality "1"]

1. d4 Nf6 2. c4 g6 3. Nc3 Bg7 4. Nf3 d5 5. e3 0-0 6. cxd5 Nxd5 7. e4 Nxc3 8. bxc3 c5 9. Be3 Nc6 10. h3 Qa5 11. Qd2 Be6 12. Rc1 Rad8 13. d5 Ne5 14. Nxe5 Bxe5 15. Be2 f5 16. Bh6 Rf7 17. c4 Qxd2+ 18. Bxd2 Bc8 19. f4 Bd4 20. e5 g5 21. e6 Rff8 22. fxg5 b5 23. Bf3 bxc4 24. Bc3 Be3 25. Bd2 Bxd2+ 26. Kxd2 Bxe6 27. Kc3 Bxd5 28. Rcd1 e6 29. Rhe1 Kf7 30. Bxd5 Rxd5 31. Kxc4 Rfd8 32. Rxd5 Rxd5 33. Re2 Ke7 34. Rb2 Kd6 35. Rb7 Rd2 36. Rxa7 Rxg2 37. Rxh7 Rxg5 38. a4 Rg8 0-1

[Event "Sofia Gerenski Memorial 11th"]
[Site "Sofia"]
[Date "2018.03.22"]
[Round "3"]
[White "Vasilev, Rosen"]
[Black "Kostov, Nikolai"]
[Result "0-1"]
[ECO "C44"]
[WhiteElo "1789"]
[BlackElo "1631"]
[PlyCount "58"]
[EventDate "2018.03.21"]
[EventType "swiss"]
[EventRounds "7"]
[EventCountry "BUL"]
[SourceTitle "CBM 183 Extra"]
[Source "ChessBase"]
[SourceDate "2018.04.19"]
[SourceVersion "1"]
[SourceVersionDate "2018.04.19"]
[SourceQuality "1"]

1. e4 e5 2. Nf3 Nc6 3. c3 d5 4. Bb5 Bg4 5. h3 Bxf3 6. Qxf3 a6 7. exd5 axb5 8. dxc6 b6 9. d4 exd4 10. 0-0 Qf6 11. Qg4 Qxc6 12. Re1+ Ne7 13. cxd4 h5 14. Qg3 0-0-0 15. Nc3 Nf5 16. Qd3 Nxd4 17. Bf4 Ne6 18. Qf5 Rd7 19. Nxb5 Qc5 20. Qe4 Qd5 21. Na7+ Kb7 22. Qa4 Nxf4 23. Qxf4 Kxa7 24. Qa4+ Kb7 25. Rad1 Qc6 26. Qb3 Re7 27. Rc1 Rxe1+ 28. Rxe1 Bc5 29. a4 Re8 0-1

[Event "Sofia Gerenski Memorial 11th"]
[Site "Sofia"]
[Date "2018.03.21"]
[Round "1"]
[White "Artunov, Kirkor"]
[Black "Kostov, Nikolai"]
[Result "0-1"]
[ECO "C58"]
[WhiteElo "1973"]
[BlackElo "1631"]
[PlyCount "80"]
[EventDate "2018.03.21"]
[EventType "swiss"]
[EventRounds "7"]
[EventCountry "BUL"]
[SourceTitle "CBM 183 Extra"]
[Source "ChessBase"]
[SourceDate "2018.04.19"]
[SourceVersion "1"]
[SourceVersionDate "2018.04.19"]
[SourceQuality "1"]

1. e4 e5 2. Nf3 Nc6 3. Bc4 Nf6 4. Ng5 d5 5. exd5 Na5 6. Bb5+ Bd7 7. Qe2 Bd6 8. d4 0-0 9. Bxd7 Qxd7 10. Qd2 Nxd5 11. Qxa5 Bb4+ 12. Qxb4 Nxb4 13. Na3 h6 14. Nf3 exd4 15. 0-0 Rfe8 16. Rd1 Qe6 17. Bd2 Nc6 18. Bf4 a6 19. Bxc7 Rac8 20. Bb6 Nb4 21. Ba5 Nc6 22. Bb6 Ne5 23. Nxe5 Qxb6 24. Nd3 Qc7 25. Rd2 b5 26. Rad1 Qb6 27. b4 Qd6 28. h3 Qd5 29. Nb1 Qxa2 30. c3 Qd5 31. Nc5 Rxc5 32. bxc5 Qxc5 33. cxd4 Qd6 34. d5 b4 35. Rd3 a5 36. Nd2 a4 37. Nb1 a3 38. Nd2 Ra8 39. Nb3 a2 40. Ra1 Ra3 0-1

[Event "Sofia MGU blitz 24th"]
[Site "Sofia"]
[Date "2018.03.17"]
[Round "9"]
[White "Babatov, Martin"]
[Black "Kostov, Nikolai"]
[Result "1-0"]
[ECO "D00"]
[WhiteElo "1578"]
[BlackElo "1631"]
[PlyCount "31"]
[EventDate "2018.03.17"]
[EventType "tourn (blitz)"]
[EventRounds "14"]
[EventCountry "BUL"]
[SourceTitle "CBM 183 Extra"]
[Source "ChessBase"]
[SourceDate "2018.04.19"]
[SourceVersion "1"]
[SourceVersionDate "2018.04.19"]
[SourceQuality "1"]

1. d4 d5 2. Bf4 Nc6 3. e3 Bf5 4. Bd3 e6 5. Bxf5 exf5 6. Nf3 Qe7 7. 0-0 0-0-0 8. Nbd2 Nf6 9. c4 dxc4 10. Nxc4 Qb4 11. Qc2 Ne4 12. Nce5 Nxe5 13. Nxe5 Qe7 14. Rac1 c6 15. Nxc6 bxc6 16. Qxc6+ 1-0

[Event "Sofia MGU blitz 24th"]
[Site "Sofia"]
[Date "2018.03.17"]
[Round "6"]
[White "Iliev, Dimitar"]
[Black "Kostov, Nikolai"]
[Result "1-0"]
[ECO "C45"]
[WhiteElo "2145"]
[BlackElo "1631"]
[PlyCount "71"]
[EventDate "2018.03.17"]
[EventType "tourn (blitz)"]
[EventRounds "14"]
[EventCountry "BUL"]
[SourceTitle "CBM 183 Extra"]
[Source "ChessBase"]
[SourceDate "2018.04.19"]
[SourceVersion "1"]
[SourceVersionDate "2018.04.19"]
[SourceQuality "1"]

1. e4 e5 2. Nf3 Nc6 3. Nc3 Nf6 4. d4 exd4 5. Nxd4 Nxd4 6. Qxd4 d6 7. Bc4 Be7 8. 0-0 0-0 9. f4 c6 10. h3 d5 11. exd5 cxd5 12. Nxd5 Nxd5 13. Bxd5 b6 14. Kh1 Bf5 15. Qe5 g6 16. Bxa8 Qxa8 17. Qxe7 Bxh3 18. Qg5 f6 19. Qg3 Bf5 20. Bd2 Bxc2 21. Bc3 f5 22. Rae1 Be4 23. Rf2 Qd8 24. Rd2 Qe7 25. a3 Rc8 26. Qf2 Rc4 27. Rd4 Qc5 28. Rd8+ Kf7 29. Qxc5 Rxc5 30. Rh8 h5 31. Rh7+ Kg8 32. Rg7+ Kf8 33. Rxa7 Rc6 34. Rd1 Ke8 35. Rdd7 Rc8 36. Rh7 1-0

[Event "Sofia MGU blitz 24th"]
[Site "Sofia"]
[Date "2018.03.17"]
[Round "2"]
[White "Kostov, Nikolai"]
[Black "Babatov, Martin"]
[Result "0-1"]
[ECO "B11"]
[WhiteElo "1631"]
[BlackElo "1578"]
[PlyCount "76"]
[EventDate "2018.03.17"]
[EventType "tourn (blitz)"]
[EventRounds "14"]
[EventCountry "BUL"]
[SourceTitle "CBM 183 Extra"]
[Source "ChessBase"]
[SourceDate "2018.04.19"]
[SourceVersion "1"]
[SourceVersionDate "2018.04.19"]
[SourceQuality "1"]

1. e4 c6 2. Nf3 d5 3. exd5 cxd5 4. Nc3 Bg4 5. h3 Bxf3 6. Qxf3 e6 7. Bb5+ Nc6 8. Bxc6+ bxc6 9. 0-0 Nf6 10. d3 Be7 11. Be3 0-0 12. Na4 Qa5 13. b3 Rfc8 14. Qf4 Qb4 15. Qxb4 Bxb4 16. c4 Nd7 17. Rac1 Ba5 18. cxd5 cxd5 19. Rxc8+ Rxc8 20. Bxa7 Rc2 21. Nc5 Nxc5 22. Bxc5 Rxc5 23. a4 Rc3 24. Rd1 Rxb3 25. Kh2 h6 26. f4 Ra3 27. g4 Rxa4 28. f5 Bc7+ 29. Kg2 exf5 30. gxf5 Rf4 31. Rf1 Rxf1 32. Kxf1 Kf8 33. Kf2 Ke7 34. Kf3 Kf6 35. Kg4 h5+ 36. Kxh5 Kxf5 37. h4 Bf4 38. d4 g6# 0-1

[Event "Sofia MGU blitz 24th"]
[Site "Sofia"]
[Date "2018.03.17"]
[Round "10"]
[White "Kostov, Nikolai"]
[Black "Dimova, Mariya"]
[Result "0-1"]
[ECO "B07"]
[WhiteElo "1631"]
[BlackElo "1434"]
[PlyCount "38"]
[EventDate "2018.03.17"]
[EventType "tourn (blitz)"]
[EventRounds "14"]
[EventCountry "BUL"]
[SourceTitle "CBM 183 Extra"]
[Source "ChessBase"]
[SourceDate "2018.04.19"]
[SourceVersion "1"]
[SourceVersionDate "2018.04.19"]
[SourceQuality "1"]

1. e4 d6 2. Nf3 e6 3. Bc4 Nc6 4. d3 Bd7 5. 0-0 Be7 6. Re1 Nf6 7. e5 dxe5 8. Nxe5 0-0 9. Nxd7 Qxd7 10. Nc3 Bc5 11. Be3 Nd4 12. Bxd4 Qxd4 13. Qf3 a6 14. Re2 Rad8 15. Qxb7 Ng4 16. Ne4 Bb6 17. c3 Qe5 18. Qxa6 Qxh2+ 19. Kf1 Qh1# 0-1

[Event "Sofia MGU blitz 24th"]
[Site "Sofia"]
[Date "2018.03.17"]
[Round "13"]
[White "Kostov, Nikolai"]
[Black "Iliev, Dimitar"]
[Result "0-1"]
[ECO "B18"]
[WhiteElo "1631"]
[BlackElo "2145"]
[PlyCount "141"]
[EventDate "2018.03.17"]
[EventType "tourn (blitz)"]
[EventRounds "14"]
[EventCountry "BUL"]
[SourceTitle "CBM 183 Extra"]
[Source "ChessBase"]
[SourceDate "2018.04.19"]
[SourceVersion "1"]
[SourceVersionDate "2018.04.19"]
[SourceQuality "1"]

1. e4 c6 2. d4 d5 3. Nc3 dxe4 4. Nxe4 Bf5 5. Ng3 Bg6 6. Nf3 Nd7 7. Nh4 e6 8. Nxg6 hxg6 9. c3 Ngf6 10. Bd3 Qc7 11. 0-0 Be7 12. Qf3 0-0 13. Bf4 Bd6 14. Bxd6 Qxd6 15. Rfe1 Nd5 16. Ne4 Qf4 17. Qxf4 Nxf4 18. Bf1 Nf6 19. Nc5 b6 20. Nb3 Rac8 21. g3 N4d5 22. Bg2 Ne7 23. a4 Nd7 24. Nd2 c5 25. Nb3 cxd4 26. Nxd4 Nc5 27. Bf1 Nf5 28. Nxf5 gxf5 29. Ra3 Rfd8 30. a5 Nd3 31. Bxd3 Rxd3 32. axb6 axb6 33. Rb3 Rc6 34. Ra1 Rcd6 35. Ra6 Rd1+ 36. Kg2 R6d2 37. Raxb6 Re1 38. Rb8+ Kh7 39. R8b4 g5 40. Rd4 Rc2 41. Rd3 Ree2 42. Rf3 Kg6 43. Rb6 Rxb2 44. Rxb2 Rxb2 45. Rd3 Rc2 46. Kf1 Kf6 47. Ke1 Ke7 48. h4 gxh4 49. gxh4 Kf6 50. Rg3 e5 51. h5 Rc1+ 52. Kd2 Rh1 53. c4 Rxh5 54. c5 Ke6 55. Rd3 Rh8 56. Rd6+ Ke7 57. Rd5 Kf6 58. Rd6+ Kg5 59. Rd5 Kf4 60. c6 Rc8 61. Rc5 f6 62. c7 e4 63. Ke2 Kg5 64. Ke3 Kg4 65. Rc1 Kg5 66. Rg1+ Kh6 67. Rc1 Kg6 68. Kf4 Kf7 69. Kxf5 Ke7 70. Kxe4 Kd7 71. Kf5 0-1

[Event "Sofia MGU blitz 24th"]
[Site "Sofia"]
[Date "2018.03.17"]
[Round "7"]
[White "Kostov, Nikolai"]
[Black "Metev, Martin"]
[Result "0-1"]
[ECO "A00"]
[WhiteElo "1631"]
[BlackElo "1987"]
[PlyCount "80"]
[EventDate "2018.03.17"]
[EventType "tourn (blitz)"]
[EventRounds "14"]
[EventCountry "BUL"]
[SourceTitle "CBM 183 Extra"]
[Source "ChessBase"]
[SourceDate "2018.04.19"]
[SourceVersion "1"]
[SourceVersionDate "2018.04.19"]
[SourceQuality "1"]

1. e4 e6 2. Nf3 d5 3. Nc3 dxe4 4. Nxe4 Nd7 5. Bc4 Ngf6 6. d3 Be7 7. Be3 0-0 8. 0-0 b6 9. Nfd2 Bb7 10. Qf3 Nxe4 11. dxe4 Ne5 12. Qf4 Bd6 13. Qg5 Qxg5 14. Bxg5 Nxc4 15. Nxc4 Bxe4 16. Nxd6 cxd6 17. c3 f6 18. Be3 Bg6 19. Rfd1 Rfd8 20. Rd3 Bxd3 21. Rd1 Bf5 22. Bd4 e5 23. Be3 d5 24. h3 Kf7 25. Kh2 Rac8 26. g4 d4 27. cxd4 exd4 28. Rxd4 Rxd4 29. Bxd4 Be6 30. b3 Rc2 31. a3 Bxb3 32. Kg3 Rd2 33. Bc3 Rd3+ 34. f3 Rxc3 35. h4 Bd5 36. g5 Rxf3+ 37. Kg4 f5+ 38. Kh5 Rf4 39. a4 g6+ 40. Kh6 Rxh4# 0-1

[Event "Sofia MGU blitz 24th"]
[Site "Sofia"]
[Date "2018.03.17"]
[Round "8"]
[White "Kostov, Nikolai"]
[Black "Mladenov, Andrey"]
[Result "1-0"]
[ECO "B07"]
[WhiteElo "1631"]
[BlackElo "1595"]
[PlyCount "39"]
[EventDate "2018.03.17"]
[EventType "tourn (blitz)"]
[EventRounds "14"]
[EventCountry "BUL"]
[SourceTitle "CBM 183 Extra"]
[Source "ChessBase"]
[SourceDate "2018.04.19"]
[SourceVersion "1"]
[SourceVersionDate "2018.04.19"]
[SourceQuality "1"]

1. e4 d6 2. Nf3 g6 3. Bc4 Bg7 4. d3 Nf6 5. Nc3 0-0 6. 0-0 c6 7. Bg5 Nbd7 8. Re1 Qc7 9. Bxf6 Nxf6 10. e5 dxe5 11. Nxe5 Nd7 12. Bxf7+ Rxf7 13. Nxf7 Kxf7 14. Qf3+ Kg8 15. Rxe7 Bf6 16. Re6 Kg7 17. Rae1 Ne5 18. Qxf6+ Kh6 19. Qf8+ Kh5 20. R1xe5+ 1-0

[Event "Sofia MGU blitz 24th"]
[Site "Sofia"]
[Date "2018.03.17"]
[Round "5"]
[White "Kostov, Nikolai"]
[Black "Yordanov, Valentin"]
[Result "1-0"]
[ECO "C01"]
[WhiteElo "1631"]
[PlyCount "55"]
[EventDate "2018.03.17"]
[EventType "tourn (blitz)"]
[EventRounds "14"]
[EventCountry "BUL"]
[SourceTitle "CBM 183 Extra"]
[Source "ChessBase"]
[SourceDate "2018.04.19"]
[SourceVersion "1"]
[SourceVersionDate "2018.04.19"]
[SourceQuality "1"]

1. e4 e6 2. Nf3 d5 3. exd5 exd5 4. d4 c5 5. Be3 Qb6 6. dxc5 Bxc5 7. Nc3 Bxe3 8. fxe3 Qxb2 9. Nxd5 Na6 10. Bxa6 bxa6 11. Nc7+ Ke7 12. Nxa8 Qb4+ 13. Qd2 Qc5 14. 0-0 Nf6 15. Ng5 Qxg5 16. Qb4+ Kd8 17. Rad1+ Bd7 18. Qb8+ Ke7 19. Qxh8 Ne8 20. Qxh7 Qxe3+ 21. Kh1 Be6 22. Qh4+ Nf6 23. Qb4+ Ke8 24. Qb8+ Bc8 25. Qxc8+ Ke7 26. Qc7+ Ke6 27. Rd6+ Ke5 28. Qe7# 1-0

[Event "Sofia MGU blitz 24th"]
[Site "Sofia"]
[Date "2018.03.17"]
[Round "14"]
[White "Metev, Martin"]
[Black "Kostov, Nikolai"]
[Result "1-0"]
[ECO "C70"]
[WhiteElo "1987"]
[BlackElo "1631"]
[PlyCount "24"]
[EventDate "2018.03.17"]
[EventType "tourn (blitz)"]
[EventRounds "14"]
[EventCountry "BUL"]
[SourceTitle "CBM 183 Extra"]
[Source "ChessBase"]
[SourceDate "2018.04.19"]
[SourceVersion "1"]
[SourceVersionDate "2018.04.19"]
[SourceQuality "1"]

1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 Bd6 5. 0-0 Nf6 6. Re1 0-0 7. c3 b5 8. Bc2 Bb7 9. d4 Ne7 10. dxe5 Bxe4 11. exd6 Bxc2 12. dxe7 Bxd1 1-0

[Event "Sofia MGU blitz 24th"]
[Site "Sofia"]
[Date "2018.03.17"]
[Round "1"]
[White "Mladenov, Andrey"]
[Black "Kostov, Nikolai"]
[Result "1-0"]
[ECO "C45"]
[WhiteElo "1595"]
[BlackElo "1631"]
[PlyCount "25"]
[EventDate "2018.03.17"]
[EventType "tourn (blitz)"]
[EventRounds "14"]
[EventCountry "BUL"]
[SourceTitle "CBM 183 Extra"]
[Source "ChessBase"]
[SourceDate "2018.04.19"]
[SourceVersion "1"]
[SourceVersionDate "2018.04.19"]
[SourceQuality "1"]

1. e4 e5 2. Nf3 Nc6 3. d4 d6 4. Bc4 exd4 5. Nxd4 Nf6 6. Nc3 Nxd4 7. Qxd4 Be6 8. Nd5 Bxd5 9. exd5 Qe7+ 10. Be3 0-0-0 11. Qxa7 Qe4 12. Bb5 Qxc2 13. Qa8# 1-0

[Event "Sofia MGU blitz 24th"]
[Site "Sofia"]
[Date "2018.03.17"]
[Round "12"]
[White "Yordanov, Valentin"]
[Black "Kostov, Nikolai"]
[Result "1-0"]
[ECO "A07"]
[BlackElo "1631"]
[PlyCount "53"]
[EventDate "2018.03.17"]
[EventType "tourn (blitz)"]
[EventRounds "14"]
[EventCountry "BUL"]
[SourceTitle "CBM 183 Extra"]
[Source "ChessBase"]
[SourceDate "2018.04.19"]
[SourceVersion "1"]
[SourceVersionDate "2018.04.19"]
[SourceQuality "1"]

1. Nf3 d5 2. g3 Nc6 3. d3 Bf5 4. Bg2 e6 5. 0-0 Nf6 6. Re1 Bd6 7. Nbd2 0-0 8. e4 dxe4 9. dxe4 Bg6 10. e5 Ng4 11. exd6 Qxd6 12. Nf1 Qc5 13. Be3 Qb4 14. Rb1 Rad8 15. Qe2 Nxe3 16. Nxe3 Qc5 17. Qc4 Qh5 18. Nh4 Rd2 19. Nxg6 Qxg6 20. Rbd1 Rfd8 21. Rxd2 Rxd2 22. Rd1 Rxd1+ 23. Nxd1 Qg5 24. Bxc6 bxc6 25. Qxc6 h6 26. Ne3 Kh7 27. Qe4+ 1-0

[Event "Sofia MGU op 209th"]
[Site "Sofia"]
[Date "2018.03.11"]
[Round "6"]
[White "Gadzhev, Denislav"]
[Black "Kostov, Nikolai"]
[Result "1-0"]
[ECO "C53"]
[WhiteElo "1535"]
[BlackElo "1631"]
[PlyCount "67"]
[EventDate "2018.03.10"]
[EventType "swiss"]
[EventRounds "6"]
[EventCountry "BUL"]
[SourceTitle "CBM 183 Extra"]
[Source "ChessBase"]
[SourceDate "2018.04.19"]
[SourceVersion "1"]
[SourceVersionDate "2018.04.19"]
[SourceQuality "1"]

1. e4 e5 2. Nf3 Nc6 3. Bc4 Bc5 4. c3 Bb6 5. d4 exd4 6. cxd4 d6 7. h3 h6 8. Nc3 Nge7 9. 0-0 0-0 10. Be3 Ng6 11. Qd2 Kh7 12. Nh2 f5 13. exf5 Bxf5 14. g4 Bd7 15. f4 Qh4 16. Rf3 Qe7 17. Qd3 Qf6 18. Nd5 Qd8 19. Bb3 Be8 20. Raf1 Kh8 21. Bc2 Nce7 22. Nxe7 Qxe7 23. f5 Rf6 24. fxg6 Bxg6 25. Qd2 Bxc2 26. Qxc2 Raf8 27. Qg2 c5 28. dxc5 dxc5 29. g5 Rxf3 30. Rxf3 Rd8 31. gxh6 g5 32. Bxg5 c4+ 33. Kh1 Rd1+ 34. Nf1 1-0

[Event "Sofia MGU op 209th"]
[Site "Sofia"]
[Date "2018.03.11"]
[Round "5"]
[White "Gelemerov, Yane"]
[Black "Kostov, Nikolai"]
[Result "0-1"]
[ECO "C27"]
[WhiteElo "1918"]
[BlackElo "1631"]
[PlyCount "144"]
[EventDate "2018.03.10"]
[EventType "swiss"]
[EventRounds "6"]
[EventCountry "BUL"]
[SourceTitle "CBM 183 Extra"]
[Source "ChessBase"]
[SourceDate "2018.04.19"]
[SourceVersion "1"]
[SourceVersionDate "2018.04.19"]
[SourceQuality "1"]

1. e4 e5 2. Bc4 Nf6 3. Nc3 Bc5 4. d3 h6 5. f4 d6 6. Nf3 Bg4 7. Na4 Bb6 8. Nxb6 axb6 9. 0-0 0-0 10. h3 Bxf3 11. Qxf3 Nbd7 12. Bb3 c6 13. c3 Qe7 14. a3 d5 15. exd5 cxd5 16. Bxd5 Qc5+ 17. d4 Qxd5 18. fxe5 Qxf3 19. gxf3 Nd5 20. f4 f5 21. Bd2 b5 22. Kf2 Rfe8 23. Rg1 Nf8 24. Rae1 Ne6 25. Kf3 Kh7 26. Rg2 Nb6 27. Reg1 Re7 28. Be1 Nd5 29. Bd2 Nb6 30. Bc1 Nd5 31. h4 h5 32. Rd1 Rc7 33. Rf2 Rac8 34. Be3 Ra8 35. Rc1 Rac8 36. Rfc2 Rc6 37. a4 bxa4 38. c4 Nb6 39. c5 Nd5 40. Ra1 b5 41. Ra3 Ndxf4 42. b3 axb3 43. Rxb3 Rb8 44. Rcb2 Nd5 45. Rxb5 Rxb5 46. Rxb5 g5 47. hxg5 f4 48. Rb7+ Kg6 49. Bxf4 Ndxf4 50. Rb6 Rc8 51. d5 Kf5 52. dxe6 Nxe6 53. Rb7 Nxg5+ 54. Kg3 Rxc5 55. Kh4 Rc1 56. Rg7 Rh1+ 57. Kg3 Ne6 58. Rf7+ Kxe5 59. Kg2 Rh3 60. Re7 Rb3 61. Rf7 Nf4+ 62. Kf2 h4 63. Re7+ Kf5 64. Rf7+ Kg5 65. Rg7+ Ng6 66. Kg2 Kf6 67. Ra7 Nf4+ 68. Kf2 h3 69. Rh7 Kg5 70. Rh8 Nh5 71. Ra8 Rb1 72. Ra5+ Kg4 0-1

[Event "Sofia MGU op 209th"]
[Site "Sofia"]
[Date "2018.03.11"]
[Round "4"]
[White "Kostov, Nikolai"]
[Black "Babatov, Martin"]
[Result "1-0"]
[ECO "D94"]
[WhiteElo "1631"]
[BlackElo "1746"]
[PlyCount "67"]
[EventDate "2018.03.10"]
[EventType "swiss"]
[EventRounds "6"]
[EventCountry "BUL"]
[SourceTitle "CBM 183 Extra"]
[Source "ChessBase"]
[SourceDate "2018.04.19"]
[SourceVersion "1"]
[SourceVersionDate "2018.04.19"]
[SourceQuality "1"]

1. d4 c6 2. c4 Nf6 3. Nc3 d5 4. e3 g6 5. cxd5 cxd5 6. Nf3 Bg7 7. Ne5 0-0 8. Be2 Nbd7 9. f4 Nb6 10. 0-0 Bf5 11. Na4 Nxa4 12. Qxa4 a6 13. Qb4 Rb8 14. Bd2 Qd6 15. g4 Be4 16. g5 Ne8 17. Qxd6 Nxd6 18. Nd7 Rbd8 19. Nxf8 Bxf8 20. Ba5 Rd7 21. Rac1 Nf5 22. Kf2 e6 23. Rc8 Ne7 24. Rc7 Rxc7 25. Bxc7 Nc6 26. a3 h6 27. Rc1 hxg5 28. fxg5 Be7 29. Bf4 a5 30. Bb5 Na7 31. Ba4 Bd8 32. Bb8 Nc6 33. Bxc6 bxc6 34. h4 1-0

[Event "Sofia MGU op 209th"]
[Site "Sofia"]
[Date "2018.03.10"]
[Round "1"]
[White "Iliev, Dimitar"]
[Black "Kostov, Nikolai"]
[Result "0-1"]
[ECO "C44"]
[WhiteElo "2145"]
[BlackElo "1631"]
[PlyCount "86"]
[EventDate "2018.03.10"]
[EventType "swiss"]
[EventRounds "6"]
[EventCountry "BUL"]
[SourceTitle "CBM 183 Extra"]
[Source "ChessBase"]
[SourceDate "2018.04.19"]
[SourceVersion "1"]
[SourceVersionDate "2018.04.19"]
[SourceQuality "1"]

1. e4 e5 2. Nf3 Nc6 3. b3 g6 4. Bb2 d6 5. d4 Bg7 6. dxe5 Bg4 7. Bc4 Nh6 8. Bb5 0-0 9. Bxc6 bxc6 10. Nbd2 d5 11. h3 Bxf3 12. Nxf3 Re8 13. Qe2 f6 14. 0-0-0 fxe5 15. Rhe1 Nf7 16. Qa6 Qd7 17. Qa5 d4 18. Rd3 Bf8 19. Red1 Qe7 20. c3 c5 21. Ba3 Ng5 22. Nd2 Ne6 23. Rg3 Nf4 24. Qb5 Rab8 25. Qf1 Qf6 26. Rf3 Qe6 27. Kb1 a5 28. cxd4 cxd4 29. Bxf8 Rxf8 30. Rc1 a4 31. Rxc7 axb3 32. Rxb3 Rxb3+ 33. axb3 Rb8 34. Kb2 d3 35. g3 Ne2 36. Qa1 Qb6 37. Qa7 Qxa7 38. Rxa7 Rf8 39. Rd7 Rxf2 40. Rxd3 Nd4 41. Kc3 Kf7 42. Kc4 Ke6 43. Kc5 Rxd2 0-1

[Event "Sofia MGU op 209th"]
[Site "Sofia"]
[Date "2018.03.10"]
[Round "2"]
[White "Kostov, Nikolai"]
[Black "Metev, Martin"]
[Result "0-1"]
[ECO "D30"]
[WhiteElo "1631"]
[BlackElo "1892"]
[PlyCount "42"]
[EventDate "2018.03.10"]
[EventType "swiss"]
[EventRounds "6"]
[EventCountry "BUL"]
[SourceTitle "CBM 183 Extra"]
[Source "ChessBase"]
[SourceDate "2018.04.19"]
[SourceVersion "1"]
[SourceVersionDate "2018.04.19"]
[SourceQuality "1"]

1. d4 e6 2. c4 d5 3. Nf3 c6 4. e3 Nf6 5. Bd3 dxc4 6. Bxc4 b5 7. Bd3 a6 8. Qc2 Bb7 9. e4 Nbd7 10. e5 Nd5 11. a3 h6 12. 0-0 c5 13. dxc5 Nxc5 14. b4 Nxd3 15. Qxd3 Nb6 16. Rd1 Qxd3 17. Rxd3 Nc4 18. Bf4 g5 19. Bg3 Bg7 20. Nbd2 g4 21. Nxc4 bxc4 0-1

[Event "Sofia MGU op 209th"]
[Site "Sofia"]
[Date "2018.03.10"]
[Round "3"]
[White "Stoyanov, Yordan"]
[Black "Kostov, Nikolai"]
[Result "0-1"]
[ECO "C45"]
[WhiteElo "1457"]
[BlackElo "1631"]
[PlyCount "48"]
[EventDate "2018.03.10"]
[EventType "swiss"]
[EventRounds "6"]
[EventCountry "BUL"]
[SourceTitle "CBM 183 Extra"]
[Source "ChessBase"]
[SourceDate "2018.04.19"]
[SourceVersion "1"]
[SourceVersionDate "2018.04.19"]
[SourceQuality "1"]

1. e4 e5 2. Nf3 Nc6 3. d4 exd4 4. Nxd4 Bc5 5. Nb3 Bb6 6. a4 Qf6 7. Qd2 a5 8. Nc3 Nge7 9. Bd3 0-0 10. 0-0 Ne5 11. Be2 c6 12. Nd4 Bxd4 13. Qxd4 Nf3+ 14. Bxf3 Qxd4 15. Be3 Qb4 16. Rab1 Re8 17. Rfd1 Ng6 18. Rd4 Qe7 19. Rbd1 Rb8 20. h3 Nh4 21. Be2 Qf6 22. Bc4 Qg6 23. Bf1 Nf3+ 24. Kh1 Nxd4 0-1

[Event "Sofia MGU op 207th"]
[Site "Sofia"]
[Date "2018.02.24"]
[Round "1"]
[White "Kostov, Nikolai"]
[Black "Iliev, Dimitar"]
[Result "0-1"]
[ECO "A46"]
[WhiteElo "1631"]
[BlackElo "2145"]
[PlyCount "128"]
[EventDate "2018.02.24"]
[EventType "swiss"]
[EventRounds "6"]
[EventCountry "BUL"]
[SourceTitle "CBM 183 Extra"]
[Source "ChessBase"]
[SourceDate "2018.04.19"]
[SourceVersion "1"]
[SourceVersionDate "2018.04.19"]
[SourceQuality "1"]

1. d4 Nf6 2. Nf3 d6 3. g3 c6 4. c4 Qc7 5. Nc3 e5 6. e4 Bg4 7. Bg2 Be7 8. Be3 0-0 9. 0-0 Nbd7 10. Qd2 a6 11. Rac1 Rfe8 12. h3 Bxf3 13. Bxf3 Bf8 14. Rfe1 g6 15. d5 c5 16. a3 Reb8 17. Qd3 b6 18. b4 Bg7 19. b5 a5 20. a4 Kh8 21. Qd2 Rg8 22. h4 Raf8 23. Bh6 Bxh6 24. Qxh6 Rg7 25. Qg5 h5 26. Kg2 Qd8 27. Rh1 Ng8 28. Qxd8 Rxd8 29. Kf1 Kh7 30. Ke2 Kh6 31. Rcg1 f5 32. Bg2 Rf7 33. f3 Rdf8 34. Rf1 Ngf6 35. Bh3 f4 36. g4 hxg4 37. fxg4 Kg7 38. h5 Nh7 39. hxg6 Kxg6 40. Bg2 Ndf6 41. Bf3 Ng5 42. Rh4 Rh7 43. Rfh1 Rff7 44. Kf2 Rxh4 45. Rxh4 Rh7 46. Rxh7 Ngxh7 47. Kg2 Kg5 48. Kh3 Nf8 49. Nd1 Ng6 50. Nf2 Ne7 51. Bd1 Neg8 52. Be2 f3 53. Bxf3 Kf4 54. Kg2 Ne7 55. Nh3+ Ke3 56. g5 Nxe4 57. Bxe4 Kxe4 58. Kg3 Kd3 59. Nf2+ Kxc4 60. Ne4 Kxd5 61. Kf3 Ke6 62. Kg4 d5 63. Nxc5+ bxc5 64. b6 Kd6 0-1

[Event "Sofia MGU op 207th"]
[Site "Sofia"]
[Date "2018.02.24"]
[Round "2"]
[White "Tsekov, Vasil"]
[Black "Kostov, Nikolai"]
[Result "1-0"]
[ECO "B57"]
[BlackElo "1631"]
[PlyCount "63"]
[EventDate "2018.02.24"]
[EventType "swiss"]
[EventRounds "6"]
[EventCountry "BUL"]
[SourceTitle "CBM 183 Extra"]
[Source "ChessBase"]
[SourceDate "2018.04.19"]
[SourceVersion "1"]
[SourceVersionDate "2018.04.19"]
[SourceQuality "1"]

1. Nf3 c5 2. e4 Nc6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 d6 6. Bc4 g6 7. Nxc6 bxc6 8. e5 Ng4 9. exd6 Qxd6 10. Qxd6 exd6 11. 0-0 Be6 12. Re1 Kd7 13. Bf1 Bg7 14. h3 Nf6 15. Bd2 Rab8 16. Rab1 Nd5 17. Nxd5 Bxd5 18. c4 Be6 19. b4 Rhc8 20. Be3 Bc3 21. Red1 Rxb4 22. Rxb4 Bxb4 23. c5 d5 24. Rb1 Bc3 25. Bf4 Ba5 26. Ba6 Re8 27. Rb7+ Kd8 28. Bg5+ Kc8 29. Re7+ Kd8 30. Rxa7+ f6 31. Bxf6+ Re7 32. Rxe7 1-0

[Event "Sofia MGU op 206th"]
[Site "Sofia"]
[Date "2018.02.18"]
[Round "4"]
[White "Kostov, Nikolai"]
[Black "Mladenov, Andrey"]
[Result "0-1"]
[ECO "D04"]
[WhiteElo "1631"]
[BlackElo "1552"]
[PlyCount "102"]
[EventDate "2018.02.17"]
[EventType "tourn"]
[EventRounds "5"]
[EventCountry "BUL"]
[SourceTitle "CBM 182 Extra"]
[Source "ChessBase"]
[SourceDate "2018.02.23"]
[SourceVersion "1"]
[SourceVersionDate "2018.02.23"]
[SourceQuality "1"]

1. d4 d5 2. e3 Nf6 3. Bd3 g6 4. Nf3 Bg7 5. Ne5 0-0 6. c4 c6 7. f4 Nbd7 8. 0-0 Ne8 9. cxd5 cxd5 10. Nc3 Nc7 11. Qf3 Nxe5 12. fxe5 f6 13. exf6 Rxf6 14. Qg3 Rxf1+ 15. Bxf1 Bf5 16. Qf4 Qd7 17. Be2 Rf8 18. Bf3 Be4 19. Qg3 Bxf3 20. gxf3 b5 21. Ne2 Ne6 22. f4 Qc7 23. Nc3 Qc4 24. Qg2 Rf5 25. Qe2 Qxe2 26. Nxe2 g5 27. Ng3 Rf7 28. f5 Nc7 29. Bd2 h5 30. Nxh5 Rxf5 31. Nxg7 Kxg7 32. Rc1 Ne6 33. Rc8 Rf8 34. Rc6 Kf6 35. e4 Kf7 36. Ra6 Nxd4 37. Be3 Nf3+ 38. Kg2 dxe4 39. Rxa7 Rc8 40. b4 Rc2+ 41. Kg3 Kf6 42. Bf2 e5 43. Ra8 Nxh2 44. Kxh2 Rxf2+ 45. Kg3 Rf4 46. a4 e3 47. Rf8+ Ke6 48. Re8+ Kd5 49. Rd8+ Kc4 50. Rd1 bxa4 51. b5 Kxb5 0-1

[Event "Sofia MGU op 206th"]
[Site "Sofia"]
[Date "2018.02.18"]
[Round "5"]
[White "Vachev, Lenko"]
[Black "Kostov, Nikolai"]
[Result "1-0"]
[ECO "D30"]
[WhiteElo "1488"]
[BlackElo "1631"]
[PlyCount "29"]
[EventDate "2018.02.17"]
[EventType "tourn"]
[EventRounds "5"]
[EventCountry "BUL"]
[SourceTitle "CBM 182 Extra"]
[Source "ChessBase"]
[SourceDate "2018.02.23"]
[SourceVersion "1"]
[SourceVersionDate "2018.02.23"]
[SourceQuality "1"]

1. d4 e6 2. Nf3 c5 3. e3 d5 4. c4 cxd4 5. Nxd4 Nc6 6. cxd5 Qxd5 7. Nc3 Bb4 8. Bd2 Bxc3 9. Bxc3 Nf6 10. Qf3 Nxd4 11. Bxd4 Qxf3 12. gxf3 Bd7 13. 0-0-0 0-0 14. Bxf6 gxf6 15. Rxd7 1-0

[Event "Sofia MGU op 206th"]
[Site "Sofia"]
[Date "2018.02.17"]
[Round "1"]
[White "Kostov, Nikolai"]
[Black "Tenev, Bogdan"]
[Result "1-0"]
[ECO "D00"]
[WhiteElo "1631"]
[BlackElo "1452"]
[PlyCount "127"]
[EventDate "2018.02.17"]
[EventType "tourn"]
[EventRounds "5"]
[EventCountry "BUL"]
[SourceTitle "CBM 182 Extra"]
[Source "ChessBase"]
[SourceDate "2018.02.23"]
[SourceVersion "1"]
[SourceVersionDate "2018.02.23"]
[SourceQuality "1"]

1. d4 d5 2. e3 Nc6 3. f4 Nf6 4. Bd3 g6 5. c3 Bg7 6. Nf3 0-0 7. 0-0 Bg4 8. Qc2 Bxf3 9. Rxf3 Qd7 10. Nd2 Rae8 11. Rh3 a6 12. Nf3 h6 13. Bd2 Nh7 14. Ne5 Nxe5 15. fxe5 Ng5 16. Rg3 Ne4 17. Bxe4 dxe4 18. Qxe4 c6 19. e6 Qxe6 20. Qxe6 fxe6 21. Rxg6 Rf6 22. Rg3 Ref8 23. e4 Kh7 24. Be3 R6f7 25. e5 c5 26. Rh3 cxd4 27. cxd4 Rc8 28. Rc1 Rff8 29. Rf3 Rxc1+ 30. Bxc1 Rc8 31. Be3 h5 32. h3 Kg6 33. g4 hxg4 34. hxg4 Bh6 35. Bxh6 Kxh6 36. Rf7 Rc7 37. Kg2 Kg6 38. Rf2 Kg5 39. Kg3 Rc1 40. Rf7 Rg1+ 41. Kf2 Rxg4 42. Ke3 Rg3+ 43. Ke4 Rg4+ 44. Kd3 b5 45. Rxe7 Rg3+ 46. Kc2 Kf5 47. Ra7 Rg4 48. Kc3 Rg3+ 49. Kb4 Rg2 50. Rxa6 Rxb2+ 51. Kc5 b4 52. Ra8 b3 53. axb3 Rxb3 54. Rf8+ Ke4 55. Rf6 Rc3+ 56. Kd6 Rd3 57. Kxe6 Rxd4 58. Rf1 Ra4 59. Re1+ Kf4 60. Kf6 Ra8 61. e6 Rf8+ 62. Kg7 Ra8 63. e7 Ra7 64. Kf8 1-0

[Event "Sofia MGU op 206th"]
[Site "Sofia"]
[Date "2018.02.17"]
[Round "3"]
[White "Kostov, Nikolai"]
[Black "Tsekov, Vasil"]
[Result "1-0"]
[ECO "E71"]
[WhiteElo "1631"]
[PlyCount "45"]
[EventDate "2018.02.17"]
[EventType "tourn"]
[EventRounds "5"]
[EventCountry "BUL"]
[SourceTitle "CBM 182 Extra"]
[Source "ChessBase"]
[SourceDate "2018.02.23"]
[SourceVersion "1"]
[SourceVersionDate "2018.02.23"]
[SourceQuality "1"]

1. d4 Nf6 2. c4 g6 3. Nc3 Bg7 4. e4 0-0 5. Be3 d6 6. h3 a6 7. Nf3 Nc6 8. Be2 Rb8 9. Qd2 e5 10. d5 Ne7 11. Bh6 Ne8 12. g4 Kh8 13. Bxg7+ Kxg7 14. 0-0-0 c5 15. Rdg1 Nc7 16. h4 h6 17. h5 Ng8 18. g5 b5 19. gxh6+ Nxh6 20. hxg6 Ng4 21. Rxg4 Bxg4 22. Qh6+ Kf6 23. g7+ 1-0

[Event "Sofia MGU op 205th"]
[Site "Sofia"]
[Date "2018.02.04"]
[Round "6"]
[White "Kostov, Nikolai"]
[Black "Kolev, Nikola"]
[Result "1/2-1/2"]
[ECO "A84"]
[WhiteElo "1631"]
[BlackElo "1931"]
[PlyCount "80"]
[EventDate "2018.02.03"]
[EventType "swiss"]
[EventRounds "6"]
[EventCountry "BUL"]
[SourceTitle "CBM 182 Extra"]
[Source "ChessBase"]
[SourceDate "2018.02.23"]
[SourceVersion "1"]
[SourceVersionDate "2018.02.23"]
[SourceQuality "1"]

1. d4 f5 2. e3 Nf6 3. Bd3 e6 4. c4 b6 5. f3 Bb7 6. Nh3 Nc6 7. Nc3 Be7 8. 0-0 0-0 9. a3 a5 10. Qc2 g6 11. b3 h6 12. Bb2 g5 13. f4 g4 14. Nf2 Qe8 15. Rae1 Qh5 16. Ne2 d5 17. cxd5 Nxd5 18. Ng3 Qf7 19. Bc4 Bd6 20. Nd3 Qg7 21. Ne5 Nxe5 22. fxe5 Be7 23. e4 fxe4 24. Nxe4 Kh8 25. Rxf8+ Rxf8 26. Bxd5 Bxd5 27. Ng3 Bh4 28. Rf1 Bxg3 29. Rxf8+ Qxf8 30. hxg3 Qf7 31. b4 axb4 32. axb4 b5 33. Qe2 Qf5 34. Bc1 Bc4 35. Qf2 Qxf2+ 36. Kxf2 Kg7 37. Ke3 Kg6 38. Kf2 h5 39. Ke3 Kf5 40. Bd2 Bd5 1/2-1/2

[Event "Sofia MGU op 205th"]
[Site "Sofia"]
[Date "2018.02.04"]
[Round "5"]
[White "Krastev, Krasimir Naidenov"]
[Black "Kostov, Nikolai"]
[Result "1/2-1/2"]
[ECO "B40"]
[WhiteElo "1688"]
[BlackElo "1631"]
[PlyCount "47"]
[EventDate "2018.02.03"]
[EventType "swiss"]
[EventRounds "6"]
[EventCountry "BUL"]
[SourceTitle "CBM 182 Extra"]
[Source "ChessBase"]
[SourceDate "2018.02.23"]
[SourceVersion "1"]
[SourceVersionDate "2018.02.23"]
[SourceQuality "1"]

1. d4 e6 2. e4 c5 3. Nf3 d5 4. Bb5+ Bd7 5. Bxd7+ Qxd7 6. exd5 Qxd5 7. Nc3 Qc4 8. Qe2 Qxe2+ 9. Kxe2 Na6 10. Bf4 f6 11. Bg3 cxd4 12. Nxd4 e5 13. Ne6 Kf7 14. Nxf8 Rxf8 15. Rad1 Ne7 16. Rd7 Nc5 17. Rc7 Rc8 18. Rxc8 Rxc8 19. Nb5 Rc6 20. Rd1 a6 21. Nc3 Ne6 22. f3 Nd4+ 23. Kd2 b5 24. Bf2 1/2-1/2

[Event "Sofia MGU op 205th"]
[Site "Sofia"]
[Date "2018.02.03"]
[Round "1"]
[White "Gelemerov, Yane"]
[Black "Kostov, Nikolai"]
[Result "1-0"]
[ECO "B23"]
[WhiteElo "1918"]
[BlackElo "1631"]
[PlyCount "43"]
[EventDate "2018.02.03"]
[EventType "swiss"]
[EventRounds "6"]
[EventCountry "BUL"]
[SourceTitle "CBM 182 Extra"]
[Source "ChessBase"]
[SourceDate "2018.02.23"]
[SourceVersion "1"]
[SourceVersionDate "2018.02.23"]
[SourceQuality "1"]

1. e4 c5 2. Nc3 Nc6 3. f4 e6 4. Nf3 d5 5. Bb5 a6 6. Bxc6+ bxc6 7. d3 Nf6 8. Qe2 Be7 9. 0-0 a5 10. Ne5 Qc7 11. b3 Ba6 12. Bd2 Bd6 13. Nxf7 Qxf7 14. e5 Be7 15. exf6 Bxf6 16. Rae1 Bc8 17. Na4 Ra6 18. Be3 d4 19. Bc1 Qe7 20. Ba3 Qc7 21. Nxc5 Ra7 22. Nxe6 1-0

[Event "Sofia MGU op 205th"]
[Site "Sofia"]
[Date "2018.02.03"]
[Round "3"]
[White "Metev, Martin"]
[Black "Kostov, Nikolai"]
[Result "1-0"]
[ECO "C45"]
[WhiteElo "1892"]
[BlackElo "1631"]
[PlyCount "109"]
[EventDate "2018.02.03"]
[EventType "swiss"]
[EventRounds "6"]
[EventCountry "BUL"]
[SourceTitle "CBM 182 Extra"]
[Source "ChessBase"]
[SourceDate "2018.02.23"]
[SourceVersion "1"]
[SourceVersionDate "2018.02.23"]
[SourceQuality "1"]

1. e4 e5 2. Nf3 Nc6 3. Nc3 Nf6 4. d4 exd4 5. Nxd4 Bc5 6. Nxc6 dxc6 7. Qxd8+ Kxd8 8. Bg5 Be7 9. Bc4 Ke8 10. 0-0 Nd7 11. Bxe7 Kxe7 12. f4 Re8 13. Rad1 Kf8 14. e5 Nb6 15. Bd3 Bg4 16. Rd2 Rad8 17. Rff2 g6 18. Ne4 Nd7 19. h3 Bf5 20. g4 Bxe4 21. Bxe4 Nc5 22. Bg2 Rxd2 23. Rxd2 Ke7 24. Kf2 Nd7 25. a4 h6 26. a5 a6 27. Rd3 Rd8 28. Ke3 g5 29. Rb3 Nc5 30. Rc3 gxf4+ 31. Kxf4 Ne6+ 32. Kg3 Rd4 33. Rf3 b5 34. axb6 cxb6 35. Rf6 c5 36. Rxh6 Rd2 37. Be4 Re2 38. Bf5 Rxe5 39. Bxe6 fxe6 40. Rh7+ Kf6 41. h4 Re2 42. g5+ Kg6 43. Rh6+ Kg7 44. h5 c4 45. c3 Re5 46. Kf4 Rf5+ 47. Kg4 Re5 48. Rg6+ Kf7 49. Rf6+ Ke7 50. h6 Re1 51. h7 Rg1+ 52. Kf4 Rf1+ 53. Ke5 Re1+ 54. Kd4 Rh1 55. Rh6 1-0

[Event "Sofia MGU op 204th"]
[Site "Sofia"]
[Date "2018.01.28"]
[Round "4"]
[White "Kostov, Nikolai"]
[Black "Simeonov, Daniel"]
[Result "1-0"]
[ECO "D10"]
[WhiteElo "1631"]
[BlackElo "1576"]
[PlyCount "97"]
[EventDate "2018.01.27"]
[EventType "tourn"]
[EventRounds "5"]
[EventCountry "BUL"]
[SourceTitle "CBM 182 Extra"]
[Source "ChessBase"]
[SourceDate "2018.02.23"]
[SourceVersion "1"]
[SourceVersionDate "2018.02.23"]
[SourceQuality "1"]

1. d4 d5 2. c4 c6 3. Nc3 Nf6 4. e3 Bg4 5. f3 Bh5 6. Bd3 Bg6 7. cxd5 Bxd3 8. Qxd3 cxd5 9. f4 Nc6 10. Nf3 e6 11. 0-0 Be7 12. Ne5 a6 13. Bd2 Rc8 14. a3 b5 15. b4 Nd7 16. Rf3 Nb6 17. Rg3 Bf6 18. Rf1 g6 19. Bc1 Ne7 20. Rgf3 Qc7 21. Bb2 Nc4 22. Nxc4 Qxc4 23. Qxc4 Rxc4 24. g4 Nc8 25. f5 gxf5 26. gxf5 Rg8+ 27. Kh1 Bh8 28. fxe6 fxe6 29. Rf7 Nd6 30. Ra7 Rc6 31. Ra8+ Nc8 32. Rc1 Rf8 33. Kg2 Kd7 34. Ne2 Rd6 35. Nf4 Bf6 36. Nd3 Re8 37. Nc5+ Kc7 38. Rxa6 Rxa6 39. Nxa6+ Kd6 40. a4 Nb6 41. a5 Nc4 42. Bc3 Nxe3+ 43. Kf3 Rf8 44. Ke2 Bg5 45. Bd2 Nf5 46. Bxg5 Nxd4+ 47. Kd3 Nc6 48. Rc5 Nxb4+ 49. Nxb4 1-0

[Event "Sofia MGU op 204th"]
[Site "Sofia"]
[Date "2018.01.28"]
[Round "5"]
[White "Tsekov, Vasil"]
[Black "Kostov, Nikolai"]
[Result "1-0"]
[ECO "C67"]
[BlackElo "1631"]
[PlyCount "107"]
[EventDate "2018.01.27"]
[EventType "tourn"]
[EventRounds "5"]
[EventCountry "BUL"]
[SourceTitle "CBM 182 Extra"]
[Source "ChessBase"]
[SourceDate "2018.02.23"]
[SourceVersion "1"]
[SourceVersionDate "2018.02.23"]
[SourceQuality "1"]

1. e4 e5 2. Nf3 Nc6 3. Bb5 Nf6 4. 0-0 Nxe4 5. d4 Nd6 6. Bxc6 dxc6 7. dxe5 Nf5 8. Qxd8+ Kxd8 9. Nc3 h6 10. h3 Be6 11. g4 Ne7 12. Nd4 Ng6 13. Re1 Bc5 14. Nxe6+ fxe6 15. Ne4 Bb6 16. Be3 Nxe5 17. Kg2 Nd7 18. Rad1 Kc8 19. c4 Bxe3 20. Rxe3 b6 21. f4 Re8 22. Kg3 Nf6 23. g5 Nxe4+ 24. Rxe4 hxg5 25. f5 Kb7 26. fxe6 Re7 27. Rd7 Rae8 28. Rxe7 Rxe7 29. Kg4 c5 30. Kf5 Kc6 31. Ke5 a6 32. Rg4 Re8 33. Rxg5 Rh8 34. Rxg7 Rxh3 35. Rd7 Re3+ 36. Kf6 Rf3+ 37. Ke7 Rh3 38. Rd5 Re3 39. Kf6 Rf3+ 40. Rf5 Re3 41. Kf7 b5 42. b3 Kd6 43. Rd5+ Kc6 44. e7 Rf3+ 45. Ke6 Re3+ 46. Re5 Rxe5+ 47. Kxe5 Kd7 48. Kf6 Ke8 49. Ke6 b4 50. Kf6 a5 51. Ke6 a4 52. bxa4 c6 53. Kf6 b3 54. axb3 1-0

[Event "Sofia MGU op 204th"]
[Site "Sofia"]
[Date "2018.01.27"]
[Round "2"]
[White "Ivanov, Daniel"]
[Black "Kostov, Nikolai"]
[Result "1/2-1/2"]
[ECO "B22"]
[WhiteElo "1758"]
[BlackElo "1631"]
[PlyCount "63"]
[EventDate "2018.01.27"]
[EventType "tourn"]
[EventRounds "5"]
[EventCountry "BUL"]
[SourceTitle "CBM 182 Extra"]
[Source "ChessBase"]
[SourceDate "2018.02.23"]
[SourceVersion "1"]
[SourceVersionDate "2018.02.23"]
[SourceQuality "1"]

1. e4 e6 2. d4 c5 3. c3 cxd4 4. cxd4 Nf6 5. Bd3 d5 6. e5 Nfd7 7. Bb5 Qb6 8. Nc3 Bb4 9. Ba4 Nc6 10. Nf3 0-0 11. Qd3 f6 12. Bc2 f5 13. a3 Be7 14. g4 g6 15. gxf5 Rxf5 16. Rg1 Nf8 17. Bh6 Bd7 18. Rb1 Rc8 19. Qe3 Rxf3 20. Qxf3 Nxd4 21. Qd3 Nxc2+ 22. Qxc2 d4 23. Bxf8 Bxf8 24. Qd3 Be8 25. Ne4 Qa5+ 26. Qd2 Qxe5 27. f3 Bc6 28. Rc1 Rd8 29. Rg5 Qg7 30. Rg4 e5 31. Qd3 Qh6 32. Rc2 1/2-1/2

[Event "Sofia MGU op 204th"]
[Site "Sofia"]
[Date "2018.01.27"]
[Round "3"]
[White "Kostov, Nikolai"]
[Black "Iliev, Dimitar"]
[Result "0-1"]
[ECO "C44"]
[WhiteElo "1631"]
[BlackElo "2145"]
[PlyCount "32"]
[EventDate "2018.01.27"]
[EventType "tourn"]
[EventRounds "5"]
[EventCountry "BUL"]
[SourceTitle "CBM 182 Extra"]
[Source "ChessBase"]
[SourceDate "2018.02.23"]
[SourceVersion "1"]
[SourceVersionDate "2018.02.23"]
[SourceQuality "1"]

1. e4 e5 2. d4 exd4 3. Bc4 Nc6 4. c3 dxc3 5. Nf3 cxb2 6. Bxb2 Bb4+ 7. Nbd2 Nf6 8. 0-0 0-0 9. e5 Ng4 10. Ne4 d6 11. exd6 Bxd6 12. Qc2 Nce5 13. Qc3 Nxf3+ 14. gxf3 Be5 15. Qc2 Nxh2 16. Bxe5 Nxf3+ 0-1

[Event "Sofia MGU op 204th"]
[Site "Sofia"]
[Date "2018.01.27"]
[Round "1"]
[White "Kostov, Nikolai"]
[Black "Krastev, Krasimir Naidenov"]
[Result "1-0"]
[ECO "D00"]
[WhiteElo "1631"]
[BlackElo "1688"]
[PlyCount "79"]
[EventDate "2018.01.27"]
[EventType "tourn"]
[EventRounds "5"]
[EventCountry "BUL"]
[SourceTitle "CBM 182 Extra"]
[Source "ChessBase"]
[SourceDate "2018.02.23"]
[SourceVersion "1"]
[SourceVersionDate "2018.02.23"]
[SourceQuality "1"]

1. d4 Nf6 2. e3 d5 3. Bd3 Bg4 4. f3 Bh5 5. c4 e6 6. Ne2 Bb4+ 7. Bd2 Bxd2+ 8. Nxd2 0-0 9. Qc2 dxc4 10. Nxc4 Nd5 11. Bxh7+ Kh8 12. Be4 b5 13. Bxd5 exd5 14. Ne5 Nd7 15. Nxd7 Qxd7 16. Nf4 Bg6 17. Nxg6+ fxg6 18. Qxg6 Qe7 19. Qh5+ Kg8 20. Qxd5+ Rf7 21. Qxa8+ Rf8 22. Qd5+ Kh8 23. Kf2 Qb4 24. Rhe1 Qxb2+ 25. Kg1 Rf6 26. Qd8+ Kh7 27. Qxc7 Rg6 28. g4 Rf6 29. Qg3 Re6 30. Qf2 Qa3 31. Rac1 a5 32. d5 Rd6 33. Rc6 Rxc6 34. dxc6 Qc3 35. Rd1 Qxc6 36. Qh4+ Kg8 37. Rd8+ Kf7 38. Qh5+ Ke7 39. Qg5+ Kf7 40. Qd5+ 1-0

[Event "Sofia MGU op 202nd"]
[Site "Sofia"]
[Date "2018.01.14"]
[Round "5"]
[White "Kostov, Nikolai"]
[Black "Dimkovski, Stojancho"]
[Result "1/2-1/2"]
[ECO "A22"]
[WhiteElo "1631"]
[BlackElo "1731"]
[PlyCount "159"]
[EventDate "2018.01.13"]
[EventType "swiss"]
[EventRounds "6"]
[EventCountry "BUL"]
[SourceTitle "CBM 182 Extra"]
[Source "ChessBase"]
[SourceDate "2018.02.23"]
[SourceVersion "1"]
[SourceVersionDate "2018.02.23"]
[SourceQuality "1"]

1. c4 e5 2. Nc3 Nf6 3. g3 Bb4 4. a3 Bxc3 5. dxc3 h6 6. Bg2 0-0 7. e4 d6 8. Ne2 a5 9. b3 Be6 10. f4 exf4 11. Nxf4 Bg4 12. Qc2 Re8 13. 0-0 Nc6 14. h3 Be6 15. Nd5 Bxd5 16. exd5 Ne5 17. Bf4 a4 18. Bxe5 Rxe5 19. b4 Qe7 20. Rf2 Re3 21. Kh2 Qe5 22. Rf3 Nh5 23. Qf2 Re2 24. Qd4 Qxd4 25. cxd4 Rae8 26. g4 Nf6 27. Raf1 Rd2 28. R1f2 Rxd4 29. Bf1 Rde4 30. Bd3 R4e7 31. Bc2 Ra8 32. Rf4 Nd7 33. Kg3 Nb6 34. Rd4 Nd7 35. Rf3 Re5 36. Rc3 Nb6 37. Re4 Rae8 38. Rxe5 Rxe5 39. c5 Nxd5 40. cxd6 Nxc3 41. dxc7 Re8 42. Bf5 Nd5 43. c8Q Rxc8 44. Bxc8 Nxb4 45. Bxb7 Nc2 46. Bc6 Nxa3 47. Bxa4 Nc4 48. Bc6 g6 49. Bb7 Kg7 50. Bd5 Nd6 51. Bc6 Kf6 52. Kf4 g5+ 53. Kg3 Nc4 54. Bb7 Ne5 55. Bd5 Ng6 56. Bb7 Ke5 57. Bc6 f6 58. Bb7 Kd4 59. Bc6 Ke3 60. Bd7 Nf4 61. Bc8 Ne2+ 62. Kg2 Kf4 63. Ba6 Nd4 64. Bb7 Ne6 65. Bc8 Nc5 66. Bf5 Nb3 67. Bg6 Nd4 68. Kf2 Nc6 69. Be8 Ne5 70. Kg2 Nxg4 71. hxg4 Kxg4 72. Bd7+ f5 73. Bc8 h5 74. Bd7 h4 75. Bc8 Kf4 76. Kh3 Ke4 77. Bd7 f4 78. Kg4 h3 79. Kxh3 f3 80. Kg4 1/2-1/2

[Event "Sofia MGU op 202nd"]
[Site "Sofia"]
[Date "2018.01.14"]
[Round "6"]
[White "Kostov, Nikolai"]
[Black "Georgiev, Nikolay Zh"]
[Result "1/2-1/2"]
[ECO "D00"]
[WhiteElo "1631"]
[BlackElo "1588"]
[PlyCount "143"]
[EventDate "2018.01.13"]
[EventType "swiss"]
[EventRounds "6"]
[EventCountry "BUL"]
[SourceTitle "CBM 182 Extra"]
[Source "ChessBase"]
[SourceDate "2018.02.23"]
[SourceVersion "1"]
[SourceVersionDate "2018.02.23"]
[SourceQuality "1"]

1. d4 d5 2. e3 Nf6 3. Bd3 Bg4 4. f3 Bh5 5. Nh3 Nc6 6. c3 Bg6 7. 0-0 e5 8. Bb5 Qd6 9. b3 exd4 10. exd4 0-0-0 11. Bf4 Qd7 12. b4 Nh5 13. Bd2 Bd6 14. Qa4 a6 15. Bxc6 Qxc6 16. Qxc6 bxc6 17. g4 Nf6 18. a4 Rhe8 19. Bf4 Bd3 20. Rc1 Bxf4 21. Nxf4 Bxb1 22. Raxb1 Re3 23. Kf2 Rde8 24. g5 Nd7 25. Re1 Rxe1 26. Rxe1 Rxe1 27. Kxe1 g6 28. Nd3 Kd8 29. Kf2 Ke7 30. Kg3 Ke6 31. a5 Kf5 32. h4 f6 33. gxf6 Kxf6 34. Kf4 h6 35. Kg4 Ke6 36. f4 Kf6 37. h5 Kg7 38. hxg6 Kxg6 39. f5+ Kf6 40. Kf4 h5 41. Ne5 Nb8 42. Nf3 Nd7 43. Nd2 Nf8 44. c4 Nd7 45. cxd5 cxd5 46. b5 Nb8 47. bxa6 Nxa6 48. Nb3 h4 49. Kg4 h3 50. Kxh3 Kxf5 51. Nc5 Nb4 52. Kg3 Kf6 53. a6 Nc6 54. Kf4 Na7 55. Nd7+ Ke6 56. Nc5+ Kd6 57. Kf5 Nb5 58. Kf6 Kc6 59. Ke5 Na7 60. Ke6 Nb5 61. Ke7 Na7 62. Kd8 Kb6 63. Kd7 Nb5 64. Ne6 c6 65. Nc5 Nxd4 66. a7 Kxa7 67. Kc7 Ka8 68. Kb6 Kb8 69. Na6+ Kc8 70. Kc5 Kd7 71. Kxd4 Kd6 72. Nc5 1/2-1/2

[Event "Sofia MGU op 202nd"]
[Site "Sofia"]
[Date "2018.01.14"]
[Round "4"]
[White "Mladenov, Andrey"]
[Black "Kostov, Nikolai"]
[Result "0-1"]
[ECO "C50"]
[WhiteElo "1552"]
[BlackElo "1631"]
[PlyCount "78"]
[EventDate "2018.01.13"]
[EventType "swiss"]
[EventRounds "6"]
[EventCountry "BUL"]
[SourceTitle "CBM 182 Extra"]
[Source "ChessBase"]
[SourceDate "2018.02.23"]
[SourceVersion "1"]
[SourceVersionDate "2018.02.23"]
[SourceQuality "1"]

1. e4 e5 2. Nf3 Nc6 3. d4 exd4 4. Bc4 Be7 5. c3 Nf6 6. e5 Ng4 7. cxd4 d5 8. exd6 Qxd6 9. 0-0 Bf5 10. h3 h5 11. Nc3 0-0-0 12. Nb5 Qg6 13. Nh2 a6 14. hxg4 hxg4 15. Na7+ Nxa7 16. Bf4 Bd6 17. Qd2 Qh5 18. Bxd6 Rxd6 19. Qf4 Rxd4 20. Qg3 Rxc4 21. Rfc1 Rxc1+ 22. Rxc1 Nc6 23. Rc5 Qh7 24. b4 Be6 25. a4 Qb1+ 26. Nf1 Qxb4 27. Qe3 Qd4 28. Qc1 g3 29. Nxg3 Rd8 30. Qg5 Qxa4 31. Qxg7 Qd1+ 32. Nf1 Qd4 33. Qg5 a5 34. Rc1 a4 35. Qb5 Qb4 36. Qe2 a3 37. Ne3 Qd2 38. Qf1 a2 39. Ra1 Nd4 0-1

[Event "Sofia MGU op 202nd"]
[Site "Sofia"]
[Date "2018.01.13"]
[Round "3"]
[White "Atanasov, Vasil"]
[Black "Kostov, Nikolai"]
[Result "1/2-1/2"]
[ECO "A43"]
[BlackElo "1631"]
[PlyCount "40"]
[EventDate "2018.01.13"]
[EventType "swiss"]
[EventRounds "6"]
[EventCountry "BUL"]
[SourceTitle "CBM 182 Extra"]
[Source "ChessBase"]
[SourceDate "2018.02.23"]
[SourceVersion "1"]
[SourceVersionDate "2018.02.23"]
[SourceQuality "1"]

1. d4 e6 2. e4 c5 3. d5 exd5 4. exd5 d6 5. c4 Be7 6. Nc3 Nf6 7. Bd3 0-0 8. Nge2 Re8 9. Qc2 g6 10. Bd2 a6 11. 0-0 Nbd7 12. f4 Bf8 13. h3 Bg7 14. Rae1 b6 15. Ng3 Rxe1 16. Rxe1 Bb7 17. f5 Ne5 18. fxg6 hxg6 19. Bf4 Nxd3 20. Qxd3 Qd7 1/2-1/2

[Event "Sofia MGU op 202nd"]
[Site "Sofia"]
[Date "2018.01.13"]
[Round "2"]
[White "Kostov, Nikolai"]
[Black "Metev, Martin"]
[Result "1/2-1/2"]
[ECO "D05"]
[WhiteElo "1631"]
[BlackElo "1892"]
[PlyCount "54"]
[EventDate "2018.01.13"]
[EventType "swiss"]
[EventRounds "6"]
[EventCountry "BUL"]
[SourceTitle "CBM 182 Extra"]
[Source "ChessBase"]
[SourceDate "2018.02.23"]
[SourceVersion "1"]
[SourceVersionDate "2018.02.23"]
[SourceQuality "1"]

1. d4 e6 2. e3 d5 3. Bd3 Nf6 4. f4 Be7 5. Nf3 0-0 6. 0-0 b6 7. Ne5 Bb7 8. Nd2 Nbd7 9. c4 c5 10. cxd5 exd5 11. Qc2 c4 12. Bf5 g6 13. Bh3 Qc7 14. Ndf3 Nxe5 15. Nxe5 Ne4 16. Bd2 Bc8 17. Bxc8 Raxc8 18. Be1 f5 19. Rd1 b5 20. a3 a5 21. b4 axb4 22. Bxb4 Bxb4 23. axb4 Ra8 24. Ra1 Qb7 25. g4 Rxa1 26. Rxa1 Ra8 27. Ra2 Kh8 1/2-1/2

[Event "Sofia MGU op 202nd"]
[Site "Sofia"]
[Date "2018.01.13"]
[Round "1"]
[White "Kostov, Nikolai"]
[Black "Novevski, Bojan"]
[Result "1-0"]
[ECO "D00"]
[WhiteElo "1631"]
[BlackElo "1357"]
[PlyCount "101"]
[EventDate "2018.01.13"]
[EventType "swiss"]
[EventRounds "6"]
[EventCountry "BUL"]
[SourceTitle "CBM 182 Extra"]
[Source "ChessBase"]
[SourceDate "2018.02.23"]
[SourceVersion "1"]
[SourceVersionDate "2018.02.23"]
[SourceQuality "1"]

1. d4 d5 2. e3 Nf6 3. Bd3 Nc6 4. f4 Bg4 5. Nf3 Nb4 6. 0-0 Nxd3 7. Qxd3 h6 8. Ne5 Qd6 9. Qb5+ c6 10. Qxb7 Rb8 11. Qxc6+ Qxc6 12. Nxc6 Rb6 13. Ne5 g5 14. c4 Be2 15. c5 Ra6 16. Rf2 Bb5 17. Rc2 Bc6 18. b4 e6 19. Nxc6 Rxc6 20. b5 Rc7 21. a4 gxf4 22. a5 Nd7 23. c6 Nb8 24. a6 Bd6 25. Ba3 Bxa3 26. Rxa3 fxe3 27. Rxe3 Ke7 28. Rb2 Kd6 29. Ra3 Rcc8 30. Rf3 Rc7 31. Rf4 f5 32. Nd2 Rg7 33. Nf3 Rg4 34. Rxg4 fxg4 35. Ne5 Rf8 36. g3 h5 37. Kg2 Kc7 38. h3 gxh3+ 39. Kxh3 Rg8 40. Nd3 Kb6 41. Nf4 Re8 42. Kh4 Nxc6 43. bxc6+ Kxc6 44. Nd3 Rg8 45. Ne5+ Kd6 46. Rb7 Rd8 47. Nf7+ Kc6 48. Nxd8+ Kd6 49. Nf7+ Kc6 50. Ne5+ Kd6 51. Rd7# 1-0

[Event "Sofia MGU op 201st"]
[Site "Sofia"]
[Date "2018.01.07"]
[Round "5"]
[White "Kostov, Nikolai"]
[Black "Metev, Martin"]
[Result "0-1"]
[ECO "D48"]
[WhiteElo "1631"]
[BlackElo "1892"]
[PlyCount "86"]
[EventDate "2018.01.06"]
[EventType "swiss"]
[EventRounds "6"]
[EventCountry "BUL"]
[SourceTitle "CBM 182 Extra"]
[Source "ChessBase"]
[SourceDate "2018.02.23"]
[SourceVersion "1"]
[SourceVersionDate "2018.02.23"]
[SourceQuality "1"]

1. d4 e6 2. Nf3 d5 3. c4 c6 4. e3 Nf6 5. Nc3 Nbd7 6. Bd3 dxc4 7. Bxc4 b5 8. Bd3 a6 9. 0-0 c5 10. dxc5 Nxc5 11. Bc2 Bb7 12. b4 Qxd1 13. Rxd1 Ncd7 14. a3 Nb6 15. Bb3 Be7 16. Bb2 0-0 17. Ne5 Rfd8 18. Rxd8+ Rxd8 19. Rd1 Rxd1+ 20. Bxd1 Bd6 21. Ne2 Bxe5 22. Bxe5 Nc4 23. Bxf6 gxf6 24. Bc2 Nxa3 25. Bd3 Bd5 26. Nd4 f5 27. f3 Bc4 28. Nc2 Bxd3 29. Nxa3 e5 30. g3 Kf8 31. Kf2 Ke7 32. Ke1 e4 33. Kd2 Kd6 34. f4 Kc6 35. Kc3 Kb6 36. Nc2 Bxc2 37. Kxc2 a5 38. Kb3 axb4 39. Kxb4 Kc6 40. h3 h5 41. h4 Kb6 42. Kb3 Kc5 43. Kc3 b4+ 0-1

[Event "Sofia MGU op 201st"]
[Site "Sofia"]
[Date "2018.01.07"]
[Round "4"]
[White "Kostov, Nikolai"]
[Black "Punchev, Ivan"]
[Result "1-0"]
[ECO "B40"]
[WhiteElo "1631"]
[BlackElo "1688"]
[PlyCount "84"]
[EventDate "2018.01.06"]
[EventType "swiss"]
[EventRounds "6"]
[EventCountry "BUL"]
[SourceTitle "CBM 182 Extra"]
[Source "ChessBase"]
[SourceDate "2018.02.23"]
[SourceVersion "1"]
[SourceVersionDate "2018.02.23"]
[SourceQuality "1"]

1. e4 c5 2. Nf3 e6 3. d4 cxd4 4. Qxd4 Nc6 5. Qd2 Nf6 6. Bd3 Bc5 7. 0-0 Qc7 8. c3 d5 9. exd5 exd5 10. b4 Bb6 11. a4 a6 12. Ba3 Bg4 13. Re1+ Be6 14. b5 Na5 15. Qb2 Ng4 16. Re2 0-0-0 17. bxa6 Nc4 18. axb7+ Kb8 19. Bxc4 dxc4 20. Nbd2 Rd3 21. h3 h5 22. a5 Ba7 23. Qb5 Rhd8 24. hxg4 hxg4 25. Ne5 Bd7 26. Qxc4 Qxc4 27. Ndxc4 Bb5 28. Nxd3 Bxc4 29. Re7 Bxd3 30. Rd1 g3 31. Rxf7 gxf2+ 32. Rxf2 Kxb7 33. Rdd2 Bxf2+ 34. Kxf2 Kc7 35. Ke3 Kb7 36. Kf2 Rd5 37. Ke3 Bc4 38. Bb4 Ka6 39. Rxd5 Bxd5 40. Kd3 Kb5 41. g3 Bc4+ 42. Kd4 Bd5 1-0

[Event "Sofia MGU op 201st"]
[Site "Sofia"]
[Date "2018.01.07"]
[Round "6"]
[White "Simeonov, Daniel"]
[Black "Kostov, Nikolai"]
[Result "0-1"]
[ECO "C44"]
[WhiteElo "1576"]
[BlackElo "1631"]
[PlyCount "56"]
[EventDate "2018.01.06"]
[EventType "swiss"]
[EventRounds "6"]
[EventCountry "BUL"]
[SourceTitle "CBM 182 Extra"]
[Source "ChessBase"]
[SourceDate "2018.02.23"]
[SourceVersion "1"]
[SourceVersionDate "2018.02.23"]
[SourceQuality "1"]

1. e4 e5 2. Nf3 Nc6 3. c3 d5 4. exd5 Qxd5 5. Be2 e4 6. Ng1 Bf5 7. Qb3 Qxb3 8. axb3 Ne5 9. Ra5 Bd6 10. f3 exf3 11. Nxf3 Nd3+ 12. Bxd3 Bxd3 13. Ra1 0-0-0 14. Kf2 Bc5+ 15. Kg3 Nf6 16. Re1 Ne4+ 17. Kh3 Rd6 18. Na3 Rh6+ 19. Kg4 Rg6+ 20. Kf4 Nf6 21. Ne5 Nh5+ 22. Kf3 Rf6+ 23. Kg4 Bg6 24. Nxg6 hxg6 25. d4 Bd6 26. Bg5 Rf2 27. g3 f5+ 28. Kh3 Nf4# 0-1

[Event "Sofia MGU op 201st"]
[Site "Sofia"]
[Date "2018.01.06"]
[Round "3"]
[White "Georgiev, Nikolay Zh"]
[Black "Kostov, Nikolai"]
[Result "1-0"]
[ECO "B00"]
[WhiteElo "1588"]
[BlackElo "1631"]
[PlyCount "57"]
[EventDate "2018.01.06"]
[EventType "swiss"]
[EventRounds "6"]
[EventCountry "BUL"]
[SourceTitle "CBM 182 Extra"]
[Source "ChessBase"]
[SourceDate "2018.02.23"]
[SourceVersion "1"]
[SourceVersionDate "2018.02.23"]
[SourceQuality "1"]

1. e4 e6 2. Nf3 b6 3. Nc3 Bb7 4. Bc4 c6 5. d3 d5 6. Bb3 Nf6 7. Qe2 Be7 8. 0-0 0-0 9. Bf4 d4 10. Nb1 c5 11. Nbd2 Nc6 12. Ne5 Nxe5 13. Bxe5 Bd6 14. Nc4 Bxe5 15. Nxe5 Qe7 16. f4 Nd7 17. Nxd7 Qxd7 18. f5 exf5 19. Rxf5 Rae8 20. Raf1 Re7 21. Qh5 Kh8 22. Rxf7 Rexf7 23. Rxf7 Rxf7 24. Qxf7 Qc8 25. e5 b5 26. e6 c4 27. e7 Qg8 28. e8Q h6 29. Qfxg8# 1-0

[Event "Sofia MGU op 201st"]
[Site "Sofia"]
[Date "2018.01.06"]
[Round "1"]
[White "Iliev, Dimitar"]
[Black "Kostov, Nikolai"]
[Result "1/2-1/2"]
[ECO "C25"]
[WhiteElo "2145"]
[BlackElo "1631"]
[PlyCount "34"]
[EventDate "2018.01.06"]
[EventType "swiss"]
[EventRounds "6"]
[EventCountry "BUL"]
[SourceTitle "CBM 182 Extra"]
[Source "ChessBase"]
[SourceDate "2018.02.23"]
[SourceVersion "1"]
[SourceVersionDate "2018.02.23"]
[SourceQuality "1"]

1. e4 e5 2. Nc3 d6 3. Bc4 c6 4. Nge2 Nf6 5. 0-0 b5 6. Bb3 b4 7. Na4 Nxe4 8. d4 Be7 9. f4 0-0 10. dxe5 dxe5 11. Qxd8 Rxd8 12. fxe5 Be6 13. Nf4 Bxb3 14. axb3 Nc5 15. Be3 Nbd7 16. Rad1 Nxa4 17. bxa4 Nxe5 1/2-1/2

[Event "Sofia MGU op 201st"]
[Site "Sofia"]
[Date "2018.01.06"]
[Round "2"]
[White "Kostov, Nikolai"]
[Black "Babatov, Martin"]
[Result "0-1"]
[ECO "D00"]
[WhiteElo "1631"]
[BlackElo "1746"]
[PlyCount "85"]
[EventDate "2018.01.06"]
[EventType "swiss"]
[EventRounds "6"]
[EventCountry "BUL"]
[SourceTitle "CBM 182 Extra"]
[Source "ChessBase"]
[SourceDate "2018.02.23"]
[SourceVersion "1"]
[SourceVersionDate "2018.02.23"]
[SourceQuality "1"]

1. d4 c6 2. e3 d5 3. Bd3 g6 4. f4 Bf5 5. Nf3 Bxd3 6. cxd3 e6 7. 0-0 Bg7 8. b4 a5 9. Bd2 axb4 10. Bxb4 Ne7 11. Qc2 Na6 12. Bc3 0-0 13. Nbd2 Nf5 14. Rfe1 Qe7 15. e4 Nh4 16. g3 Nxf3+ 17. Nxf3 Rfd8 18. a4 c5 19. Ba5 Rd7 20. e5 cxd4 21. Nxd4 Qc5 22. Qxc5 Nxc5 23. Bb6 Nxd3 24. Re3 Nb2 25. Rb3 Rxa4 26. Rba3 Rxa3 27. Rxa3 h6 28. Ra8+ Kh7 29. Nb5 Nc4 30. Bd4 g5 31. Kf2 Kg6 32. Rg8 gxf4 33. gxf4 Na5 34. Nd6 Kh7 35. Ra8 Nc6 36. Ke3 Nxd4 37. Kxd4 Rc7 38. Rb8 h5 39. f5 Rd7 40. fxe6 fxe6 41. Re8 Rxd6 42. Re7 Rd7 43. Re8 0-1

[Event "Sofia MGU op 200th"]
[Site "Sofia"]
[Date "2017.12.31"]
[Round "6"]
[White "Dereshki, Dario"]
[Black "Kostov, Nikolai"]
[Result "1-0"]
[ECO "A43"]
[WhiteElo "2074"]
[BlackElo "1631"]
[PlyCount "65"]
[EventDate "2017.12.30"]
[EventType "swiss"]
[EventRounds "6"]
[EventCountry "BUL"]
[SourceTitle "CBM 182 Extra"]
[Source "ChessBase"]
[SourceDate "2018.02.23"]
[SourceVersion "1"]
[SourceVersionDate "2018.02.23"]
[SourceQuality "1"]

1. d4 e6 2. c4 c5 3. d5 exd5 4. cxd5 d6 5. Nc3 Be7 6. g3 Na6 7. Bg2 Nc7 8. a4 Rb8 9. Nf3 a6 10. a5 b5 11. axb6 Rxb6 12. 0-0 Nf6 13. e4 0-0 14. Nd2 Re8 15. Nc4 Rb8 16. e5 Ng4 17. e6 f5 18. Qd3 g6 19. f3 Nf6 20. g4 fxg4 21. fxg4 Rf8 22. Bh6 Re8 23. g5 Nh5 24. Rf7 Nxe6 25. dxe6 Bxe6 26. Bd5 Bxg5 27. Bxe6 Rxe6 28. Qd5 Bxh6 29. Qxe6 Qg5+ 30. Kh1 Kh8 31. Re1 Ng7 32. Qxd6 Re8 33. Qf8+ 1-0

[Event "Sofia MGU op 200th"]
[Site "Sofia"]
[Date "2017.12.31"]
[Round "4"]
[White "Ginev, Nikola"]
[Black "Kostov, Nikolai"]
[Result "1/2-1/2"]
[ECO "A05"]
[WhiteElo "1743"]
[BlackElo "1631"]
[PlyCount "125"]
[EventDate "2017.12.30"]
[EventType "swiss"]
[EventRounds "6"]
[EventCountry "BUL"]
[SourceTitle "CBM 182 Extra"]
[Source "ChessBase"]
[SourceDate "2018.02.23"]
[SourceVersion "1"]
[SourceVersionDate "2018.02.23"]
[SourceQuality "1"]

1. Nf3 c5 2. g3 Nc6 3. Bg2 g6 4. 0-0 Bg7 5. d3 d6 6. e4 Nf6 7. Nbd2 0-0 8. Re1 Qc7 9. Nf1 Bg4 10. Ne3 Bxf3 11. Bxf3 e6 12. Bg2 Rab8 13. c3 b5 14. Ng4 Nxg4 15. Qxg4 b4 16. c4 Qa5 17. Rf1 Qc7 18. Bf3 Ne5 19. Qf4 Nxd3 20. Qd2 Nxc1 21. Raxc1 a5 22. h4 h5 23. Kg2 Kh7 24. Rcd1 Rbd8 25. Rh1 Qe7 26. Qc2 f5 27. exf5 Rxf5 28. g4 Rxf3 29. Kxf3 Rf8+ 30. Kg2 Qb7+ 31. Kg1 Bd4 32. Rh2 hxg4 33. h5 Kg8 34. Qxg6+ Qg7 35. Qxe6+ Kh8 36. h6 Qe5 37. Qxe5+ dxe5 38. Rd2 g3 39. Rg2 gxf2+ 40. Kf1 a4 41. Rd3 Rg8 42. Rxf2 Rg6 43. Rh2 e4 44. Rdd2 Kh7 45. Rdg2 Rf6+ 46. Ke2 Rf3 47. Rg4 Bxb2 48. Rxe4 Rf7 49. Re6 a3 50. Rh3 Bd4 51. Kd3 b3 52. Re2 Rb7 53. Rh1 b2 54. Rb1 Bf6 55. Rg2 Rd7+ 56. Kc2 Be5 57. Kb3 Ra7 58. Re2 Bf4 59. Re6 Bc1 60. Rc6 Ra5 61. Rb6 Ra7 62. Rb5 Be3 63. Rb6 1/2-1/2

[Event "Sofia MGU op 200th"]
[Site "Sofia"]
[Date "2017.12.31"]
[Round "5"]
[White "Kostov, Nikolai"]
[Black "Peycheva, Gergana"]
[Result "0-1"]
[ECO "E43"]
[WhiteElo "1631"]
[BlackElo "2107"]
[PlyCount "60"]
[EventDate "2017.12.30"]
[EventType "swiss"]
[EventRounds "6"]
[EventCountry "BUL"]
[SourceTitle "CBM 182 Extra"]
[Source "ChessBase"]
[SourceDate "2018.02.23"]
[SourceVersion "1"]
[SourceVersionDate "2018.02.23"]
[SourceQuality "1"]

1. d4 Nf6 2. c4 e6 3. Nf3 b6 4. Nc3 Bb7 5. e3 Bb4 6. Bd3 0-0 7. 0-0 Bxc3 8. bxc3 d6 9. Re1 Ne4 10. Qc2 f5 11. Nd2 Nxd2 12. Qxd2 Nd7 13. e4 f4 14. f3 e5 15. Qf2 Rf6 16. g4 fxg3 17. hxg3 Rg6 18. Kg2 Qe7 19. Rh1 Rf8 20. g4 Rxg4+ 21. fxg4 Rxf2+ 22. Kxf2 exd4 23. Bd2 Bxe4 24. Rh3 Qf6+ 25. Kg1 Bxd3 26. Rxd3 Ne5 27. Rf1 Qh4 28. Rxd4 Qg3+ 29. Kh1 Nxg4 30. Bf4 Nf2+ 0-1

[Event "Sofia MGU op 200th"]
[Site "Sofia"]
[Date "2017.12.30"]
[Round "2"]
[White "Ivanov, Plamen Iv"]
[Black "Kostov, Nikolai"]
[Result "1/2-1/2"]
[ECO "A43"]
[WhiteElo "1884"]
[BlackElo "1631"]
[PlyCount "76"]
[EventDate "2017.12.30"]
[EventType "swiss"]
[EventRounds "6"]
[EventCountry "BUL"]
[SourceTitle "CBM 182 Extra"]
[Source "ChessBase"]
[SourceDate "2018.02.23"]
[SourceVersion "1"]
[SourceVersionDate "2018.02.23"]
[SourceQuality "1"]

1. d4 e6 2. c4 c5 3. d5 exd5 4. cxd5 d6 5. e4 g6 6. Nf3 Bg7 7. Nc3 a6 8. a4 Bg4 9. Be2 Qe7 10. Qc2 Nd7 11. 0-0 h5 12. Bg5 Bf6 13. Bxf6 Ngxf6 14. Rfe1 Kf8 15. Rab1 Kg7 16. b4 Bxf3 17. Bxf3 cxb4 18. Rxb4 Nc5 19. Re3 Ng4 20. Bxg4 hxg4 21. f4 Rh5 22. g3 Rah8 23. Re2 Qc7 24. Qd2 f6 25. Qd4 Re8 26. Rc4 Qe7 27. Rb4 Qc7 28. Rc4 Qe7 29. Rb4 Qc7 30. Rc4 Qe7 31. e5 Qc7 32. Rb4 fxe5 33. fxe5 Rhxe5 34. Rxe5 Rxe5 35. Qxg4 Nd3 36. Rc4 Qb6+ 37. Kg2 Qf2+ 38. Kh3 Rh5+ 1/2-1/2

[Event "Sofia MGU op 200th"]
[Site "Sofia"]
[Date "2017.12.30"]
[Round "1"]
[White "Kostov, Nikolai"]
[Black "Iliev, Dimitar"]
[Result "1/2-1/2"]
[ECO "B12"]
[WhiteElo "1631"]
[BlackElo "2145"]
[PlyCount "77"]
[EventDate "2017.12.30"]
[EventType "swiss"]
[EventRounds "6"]
[EventCountry "BUL"]
[SourceTitle "CBM 182 Extra"]
[Source "ChessBase"]
[SourceDate "2018.02.23"]
[SourceVersion "1"]
[SourceVersionDate "2018.02.23"]
[SourceQuality "1"]

1. d4 d6 2. e4 c6 3. Nc3 Qc7 4. Bf4 e5 5. dxe5 dxe5 6. Bg3 Nf6 7. Bd3 Be7 8. h3 0-0 9. Nf3 Nbd7 10. 0-0 b5 11. a3 a5 12. Nh4 Nc5 13. Rc1 b4 14. axb4 axb4 15. Ne2 Ncxe4 16. Nf3 Nxg3 17. Nxg3 Nd5 18. Re1 Bf6 19. Ne4 Re8 20. Bc4 Be6 21. Bxd5 cxd5 22. Nxf6+ gxf6 23. Nh4 Kh8 24. Qh5 Rg8 25. Kh1 e4 26. Qh6 Qe5 27. f4 Qxb2 28. c3 f5 29. Qf6+ Rg7 30. Rg1 bxc3 31. Rxc3 Qf2 32. Nxf5 Bxf5 33. Qxf5 Qd4 34. Rcc1 Ra3 35. Rc8+ Rg8 36. Rxg8+ Kxg8 37. Qg5+ Kf8 38. Qd8+ Kg7 39. Qg5+ 1/2-1/2

[Event "Sofia MGU op 200th"]
[Site "Sofia"]
[Date "2017.12.30"]
[Round "3"]
[White "Kostov, Nikolai"]
[Black "Mladenov, Andrey"]
[Result "1-0"]
[ECO "D00"]
[WhiteElo "1631"]
[BlackElo "1552"]
[PlyCount "69"]
[EventDate "2017.12.30"]
[EventType "swiss"]
[EventRounds "6"]
[EventCountry "BUL"]
[SourceTitle "CBM 182 Extra"]
[Source "ChessBase"]
[SourceDate "2018.02.23"]
[SourceVersion "1"]
[SourceVersionDate "2018.02.23"]
[SourceQuality "1"]

1. d4 d5 2. e3 e6 3. f4 Nf6 4. Nf3 g6 5. Bd3 Bg7 6. 0-0 0-0 7. Nbd2 Nbd7 8. b3 c5 9. c3 b6 10. Ba3 Re8 11. Ne5 Qc7 12. Qf3 Bb7 13. Rac1 a5 14. Bb5 Ba6 15. Bxa6 Rxa6 16. Qe2 Rea8 17. g4 Ne8 18. g5 Nd6 19. Qg2 Nf5 20. Qh3 Nxe5 21. fxe5 a4 22. b4 c4 23. e4 dxe4 24. Nxe4 b5 25. Nf6+ Bxf6 26. gxf6 h5 27. Rce1 Rd8 28. Bc1 Rd5 29. a3 Kh7 30. Rf2 Ra8 31. Rg2 Rg8 32. Rg5 Nh6 33. Re4 Rdd8 34. Qe3 Nf5 35. Rxf5 1-0

[Event "Sofia MGU op 198th"]
[Site "Sofia"]
[Date "2017.12.03"]
[Round "5"]
[White "Georgiev, Nikolay"]
[Black "Kostov, Nikolai"]
[Result "1-0"]
[ECO "B20"]
[WhiteElo "1588"]
[BlackElo "1631"]
[PlyCount "91"]
[EventDate "2017.12.02"]
[EventType "swiss"]
[EventRounds "6"]
[EventCountry "BUL"]
[SourceTitle "CBM 181 Extra"]
[Source "ChessBase"]
[SourceDate "2017.12.12"]
[SourceVersion "1"]
[SourceVersionDate "2017.12.12"]
[SourceQuality "1"]

1. e4 c5 2. Nc3 e6 3. Bc4 Nc6 4. a3 a6 5. d3 Nf6 6. Ba2 b5 7. Nge2 g6 8. Bg5 h6 9. Bd2 Bg7 10. Qc1 Bb7 11. 0-0 Qc7 12. f3 0-0-0 13. Be3 d6 14. Qd2 g5 15. d4 cxd4 16. Nxd4 Nxd4 17. Bxd4 Nh5 18. Bxg7 Nxg7 19. Qd4 Qc5 20. Rad1 Kc7 21. Ne2 f5 22. Ng3 f4 23. Ne2 e5 24. Qf2 Qxf2+ 25. Kxf2 Nh5 26. Nc3 Nf6 27. Nd5+ Bxd5 28. Bxd5 g4 29. Rd3 Kd7 30. Bb7 Ke7 31. Bxa6 d5 32. exd5 e4 33. fxe4 Nxe4+ 34. Ke1 Rhf8 35. Bxb5 Rf5 36. c4 Nc5 37. Rd4 Kd6 38. b4 Re5+ 39. Kd1 Ne4 40. Kc2 Rf8 41. c5+ Kc7 42. d6+ Kd8 43. Re1 f3 44. gxf3 gxf3 45. Rdxe4 Rxe4 46. Rxe4 1-0

[Event "Sofia MGU op 198th"]
[Site "Sofia"]
[Date "2017.12.02"]
[Round "1"]
[White "Grozdanov, Elislav"]
[Black "Kostov, Nikolai"]
[Result "0-1"]
[ECO "E10"]
[BlackElo "1631"]
[PlyCount "60"]
[EventDate "2017.12.02"]
[EventType "swiss"]
[EventRounds "6"]
[EventCountry "BUL"]
[SourceTitle "CBM 181 Extra"]
[Source "ChessBase"]
[SourceDate "2017.12.12"]
[SourceVersion "1"]
[SourceVersionDate "2017.12.12"]
[SourceQuality "1"]

1. d4 Nf6 2. c4 c5 3. Nf3 e6 4. Bg5 Be7 5. Nc3 h6 6. Bh4 Nc6 7. e3 Qa5 8. Qc2 d5 9. Nd2 cxd4 10. Nb3 Qd8 11. exd4 dxc4 12. Bxc4 Nb4 13. Qd2 0-0 14. a3 Nbd5 15. 0-0 Nxc3 16. Bxf6 Bxf6 17. bxc3 b6 18. Bd3 Bb7 19. Bc2 a5 20. Qd3 g6 21. Nd2 Ba6 22. Qh3 Bxf1 23. Nxf1 Bg7 24. Ne3 Rc8 25. Ng4 h5 26. Nh6+ Bxh6 27. Bxg6 fxg6 28. Qxe6+ Kh7 29. Rb1 Qf6 30. Qd7+ Rf7 0-1

[Event "Sofia MGU op 198th"]
[Site "Sofia"]
[Date "2017.12.02"]
[Round "2"]
[White "Kostov, Nikolai"]
[Black "Metev, Martin"]
[Result "0-1"]
[ECO "D45"]
[WhiteElo "1631"]
[BlackElo "1892"]
[PlyCount "88"]
[EventDate "2017.12.02"]
[EventType "swiss"]
[EventRounds "6"]
[EventCountry "BUL"]
[SourceTitle "CBM 181 Extra"]
[Source "ChessBase"]
[SourceDate "2017.12.12"]
[SourceVersion "1"]
[SourceVersionDate "2017.12.12"]
[SourceQuality "1"]

1. d4 e6 2. c4 d5 3. Nf3 c6 4. e3 Nf6 5. Nc3 Nbd7 6. cxd5 exd5 7. Bd3 Be7 8. Qc2 0-0 9. Ne5 h6 10. Qe2 Nxe5 11. dxe5 Nd7 12. f4 b5 13. 0-0 Bb7 14. b3 a6 15. Bb2 c5 16. e6 fxe6 17. Qg4 Rf7 18. Qxe6 Nf8 19. Qg4 c4 20. Bc2 b4 21. Ne2 c3 22. Bc1 Bc5 23. Nd4 Bxd4 24. exd4 Qf6 25. Be3 Re8 26. Rae1 Rfe7 27. Bf2 Rxe1 28. Rxe1 Rxe1+ 29. Bxe1 Qxd4+ 30. Bf2 Qd2 31. Qd1 Qxf4 32. Bd4 Ne6 33. Bf2 d4 34. Qe2 Qc1+ 35. Bd1 Bd5 36. h3 Kf7 37. Qh5+ Ke7 38. Qxd5 Qxd1+ 39. Kh2 c2 40. Bg3 c1Q 41. Qd6+ Kf7 42. Be5 Qg1+ 43. Kg3 Qce3+ 44. Kh4 Qg5# 0-1

[Event "Sofia MGU op 198th"]
[Site "Sofia"]
[Date "2017.12.02"]
[Round "3"]
[White "Simeonov, Daniel"]
[Black "Kostov, Nikolai"]
[Result "1/2-1/2"]
[ECO "C65"]
[WhiteElo "1576"]
[BlackElo "1631"]
[PlyCount "82"]
[EventDate "2017.12.02"]
[EventType "swiss"]
[EventRounds "6"]
[EventCountry "BUL"]
[SourceTitle "CBM 181 Extra"]
[Source "ChessBase"]
[SourceDate "2017.12.12"]
[SourceVersion "1"]
[SourceVersionDate "2017.12.12"]
[SourceQuality "1"]

1. e4 e5 2. Nf3 Nc6 3. Bb5 Nf6 4. Qe2 d6 5. Nc3 Bg4 6. h3 Bxf3 7. Qxf3 Be7 8. Ne2 0-0 9. c3 a6 10. Ba4 b5 11. Bc2 d5 12. exd5 e4 13. Bxe4 Ne5 14. Qf5 Qd6 15. d4 Nxe4 16. Qxe4 Ng6 17. 0-0 Rad8 18. Nf4 Bf6 19. Nxg6 hxg6 20. Bf4 Qd7 21. Qf3 Rfe8 22. Rfe1 Rxe1+ 23. Rxe1 Be7 24. Qg3 Bd6 25. Bxd6 cxd6 26. Qe3 Qf5 27. a3 Qxd5 28. Qe7 Rf8 29. Qe4 Qb3 30. Re2 a5 31. f3 b4 32. axb4 axb4 33. Qc2 Qc4 34. Kf2 Rc8 35. Re3 Qxd4 36. Qd3 Qc5 37. cxb4 Qxb4 38. Re2 Qc5+ 39. Qe3 Qb4 40. g3 d5 41. Rd2 d4 1/2-1/2

[Event "Sofia MGU op 197th"]
[Site "Sofia"]
[Date "2017.11.26"]
[Round "5"]
[White "Kamenov, Valentin"]
[Black "Kostov, Nikolai"]
[Result "1-0"]
[ECO "C54"]
[WhiteElo "1773"]
[BlackElo "1631"]
[PlyCount "81"]
[EventDate "2017.11.25"]
[EventType "swiss"]
[EventRounds "6"]
[EventCountry "BUL"]
[SourceTitle "CBM 181 Extra"]
[Source "ChessBase"]
[SourceDate "2017.12.12"]
[SourceVersion "1"]
[SourceVersionDate "2017.12.12"]
[SourceQuality "1"]

1. e4 e5 2. Nf3 Nc6 3. Bc4 Bc5 4. c3 Nf6 5. d4 exd4 6. cxd4 Bb4+ 7. Nc3 Nxe4 8. Qb3 0-0 9. 0-0 Bxc3 10. bxc3 Na5 11. Qc2 Nxc4 12. Qxe4 d5 13. Qd3 f6 14. Re1 Bg4 15. Bf4 Qd7 16. Nd2 Bf5 17. Qg3 Nxd2 18. Bxd2 Rfe8 19. Be3 Bg6 20. Re2 Qc6 21. Rc1 Qc4 22. Rd2 b5 23. Rb2 a5 24. h3 Re7 25. Qf3 Be4 26. Qf4 Rae8 27. g4 Bg6 28. h4 h5 29. gxh5 Bxh5 30. Qf5 Bf7 31. h5 Re4 32. h6 Be6 33. Qh5 Rg4+ 34. Kh2 g6 35. h7+ Kh8 36. Qh6 Qc6 37. Bf4 Qd7 38. f3 Rxf4 39. Qxf4 Qxh7+ 40. Kg1 Bf5 41. Rh2 1-0

[Event "Sofia MGU op 197th"]
[Site "Sofia"]
[Date "2017.11.26"]
[Round "6"]
[White "Kostov, Nikolai"]
[Black "Georgiev, Nikolay"]
[Result "1-0"]
[ECO "D00"]
[WhiteElo "1631"]
[BlackElo "1588"]
[PlyCount "99"]
[EventDate "2017.11.25"]
[EventType "swiss"]
[EventRounds "6"]
[EventCountry "BUL"]
[SourceTitle "CBM 181 Extra"]
[Source "ChessBase"]
[SourceDate "2017.12.12"]
[SourceVersion "1"]
[SourceVersionDate "2017.12.12"]
[SourceQuality "1"]

1. d4 d5 2. e3 Nf6 3. Bd3 Bg4 4. f3 Bh5 5. Nh3 Nbd7 6. c4 e5 7. cxd5 Nxd5 8. 0-0 exd4 9. exd4 Be7 10. Nc3 N7b6 11. Be4 Bg6 12. Re1 Bxe4 13. fxe4 Nf6 14. e5 Nfd5 15. Qg4 g6 16. Rf1 f5 17. exf6 Nxf6 18. Qe6 Nfd5 19. Qf7+ Kd7 20. Nxd5 Rf8 21. Nxb6+ axb6 22. Qd5+ Bd6 23. Bg5 Rxf1+ 24. Rxf1 Qe8 25. Qf7+ Kc6 26. Qc4+ Kd7 27. Qf7+ Qxf7 28. Rxf7+ Kc6 29. Rxh7 Rxa2 30. Rh6 Rxb2 31. Rxg6 b5 32. Nf4 b4 33. d5+ Kb5 34. h4 b3 35. Nd3 Rb1+ 36. Kf2 Kc4 37. Ke2 Rg1 38. Bf6 Kxd5 39. h5 Bf8 40. Nb2 c5 41. Kd3 Rh1 42. Rg5+ Ke6 43. Bc3 b5 44. Ke4 Rh4+ 45. g4 Rh3 46. Nd3 Rxd3 47. Kxd3 c4+ 48. Kd4 b4 49. Kxc4 bxc3 50. Kxb3 1-0

[Event "Sofia MGU op 197th"]
[Site "Sofia"]
[Date "2017.11.26"]
[Round "4"]
[White "Mladenov, Andrey"]
[Black "Kostov, Nikolai"]
[Result "1/2-1/2"]
[ECO "A39"]
[WhiteElo "1552"]
[BlackElo "1631"]
[PlyCount "35"]
[EventDate "2017.11.25"]
[EventType "swiss"]
[EventRounds "6"]
[EventCountry "BUL"]
[SourceTitle "CBM 181 Extra"]
[Source "ChessBase"]
[SourceDate "2017.12.12"]
[SourceVersion "1"]
[SourceVersionDate "2017.12.12"]
[SourceQuality "1"]

1. Nf3 c5 2. g3 Nf6 3. Bg2 Nc6 4. d4 cxd4 5. Nxd4 Nxd4 6. Qxd4 g6 7. 0-0 Bg7 8. c4 0-0 9. Nc3 d6 10. Rd1 Nd7 11. Qe3 Nc5 12. Ne4 Nxe4 13. Qxe4 Qc7 14. Qc2 Be6 15. Bd5 Bh3 16. Qb3 Rab8 17. Be3 b6 18. Rac1 1/2-1/2

[Event "Sofia MGU op 197th"]
[Site "Sofia"]
[Date "2017.11.25"]
[Round "2"]
[White "Andreev, Dobrotich"]
[Black "Kostov, Nikolai"]
[Result "1-0"]
[ECO "C66"]
[WhiteElo "1829"]
[BlackElo "1631"]
[PlyCount "87"]
[EventDate "2017.11.25"]
[EventType "swiss"]
[EventRounds "6"]
[EventCountry "BUL"]
[SourceTitle "CBM 181 Extra"]
[Source "ChessBase"]
[SourceDate "2017.12.12"]
[SourceVersion "1"]
[SourceVersionDate "2017.12.12"]
[SourceQuality "1"]

1. e4 e5 2. Nf3 Nc6 3. Bb5 Nf6 4. 0-0 d6 5. d4 exd4 6. Nxd4 Bd7 7. Bg5 Be7 8. Nc3 Nxd4 9. Qxd4 0-0 10. Bxd7 Nxd7 11. Bxe7 Qxe7 12. Nd5 Qd8 13. f4 c6 14. Ne3 Qb6 15. Qxb6 axb6 16. Nf5 Nf6 17. Nxd6 Rfd8 18. e5 Nd5 19. a3 Ne3 20. Rf2 Rd7 21. h3 b5 22. Re1 Nd5 23. Ne4 Ra4 24. Nc5 Rd8 25. Nxa4 bxa4 26. Rd1 b5 27. Rfd2 Rc8 28. c3 g6 29. g3 Kg7 30. Rxd5 cxd5 31. Rxd5 Rb8 32. Kf2 Rb7 33. Rd8 Rb6 34. Ke3 h5 35. Ke4 Rb7 36. g4 hxg4 37. hxg4 Kh7 38. f5 gxf5+ 39. gxf5 Kg7 40. f6+ Kh7 41. Kf5 Kh6 42. Rd1 Kh7 43. Rg1 Rb8 44. Rg7+ 1-0

[Event "Sofia MGU op 197th"]
[Site "Sofia"]
[Date "2017.11.25"]
[Round "3"]
[White "Kostov, Nikolai"]
[Black "Damyanov, Boris"]
[Result "1-0"]
[ECO "D00"]
[WhiteElo "1631"]
[BlackElo "1488"]
[PlyCount "53"]
[EventDate "2017.11.25"]
[EventType "swiss"]
[EventRounds "6"]
[EventCountry "BUL"]
[SourceTitle "CBM 181 Extra"]
[Source "ChessBase"]
[SourceDate "2017.12.12"]
[SourceVersion "1"]
[SourceVersionDate "2017.12.12"]
[SourceQuality "1"]

1. d4 d5 2. e3 e6 3. Bd3 c5 4. c3 Nc6 5. f4 c4 6. Bc2 b5 7. Nf3 f6 8. e4 Be7 9. 0-0 Nh6 10. Qe2 Nf7 11. exd5 exd5 12. b3 0-0 13. a4 Ba6 14. axb5 Bxb5 15. b4 a5 16. bxa5 Rxa5 17. Rxa5 Qxa5 18. Nh4 Nfd8 19. Qh5 f5 20. Nxf5 g6 21. Nxe7+ Nxe7 22. Qe5 Ndc6 23. Qe6+ Kh8 24. f5 gxf5 25. Bh6 Rd8 26. Qf6+ Kg8 27. Qg7# 1-0

[Event "Sofia MGU op 197th"]
[Site "Sofia"]
[Date "2017.11.25"]
[Round "1"]
[White "Kostov, Nikolai"]
[Black "Dimova, Mariya"]
[Result "1-0"]
[ECO "C21"]
[WhiteElo "1631"]
[BlackElo "1434"]
[PlyCount "77"]
[EventDate "2017.11.25"]
[EventType "swiss"]
[EventRounds "6"]
[EventCountry "BUL"]
[SourceTitle "CBM 181 Extra"]
[Source "ChessBase"]
[SourceDate "2017.12.12"]
[SourceVersion "1"]
[SourceVersionDate "2017.12.12"]
[SourceQuality "1"]

1. e4 e5 2. d4 exd4 3. Bc4 Bc5 4. Bxf7+ Kxf7 5. Qh5+ g6 6. Qxc5 Nc6 7. Nf3 d6 8. Qc4+ Be6 9. Qe2 Qf6 10. Ng5+ Kg7 11. 0-0 Nh6 12. Qd2 Bc4 13. Re1 Raf8 14. b3 Ba6 15. h3 Ng4 16. hxg4 h6 17. Nf3 Ne5 18. Nxe5 dxe5 19. c4 c5 20. f3 Qh4 21. Qf2 Qf6 22. Rf1 b5 23. Na3 bxc4 24. Nxc4 g5 25. Qg3 Re8 26. Ba3 h5 27. gxh5 Rxh5 28. Bxc5 Bxc4 29. bxc4 Rc8 30. Qg4 Rhh8 31. Ba3 Rxc4 32. Rac1 Rh4 33. Qd7+ Kg6 34. Rxc4 Rh7 35. Qf5+ Qxf5 36. exf5+ Kxf5 37. g3 Rd7 38. Bb2 d3 39. Rc5 1-0

[Event "Sofia MGU op 196th"]
[Site "Sofia"]
[Date "2017.11.12"]
[Round "6"]
[White "Andreev, Dobrotich"]
[Black "Kostov, Nikolai"]
[Result "1/2-1/2"]
[ECO "C67"]
[WhiteElo "1829"]
[BlackElo "1631"]
[PlyCount "43"]
[EventDate "2017.11.11"]
[EventType "swiss"]
[EventRounds "6"]
[EventCountry "BUL"]
[SourceTitle "CBM 181 Extra"]
[Source "ChessBase"]
[SourceDate "2017.12.12"]
[SourceVersion "1"]
[SourceVersionDate "2017.12.12"]
[SourceQuality "1"]

1. e4 e5 2. Nf3 Nc6 3. Bb5 Nf6 4. 0-0 Nxe4 5. Re1 Nd6 6. Nxe5 Nxe5 7. Rxe5+ Be7 8. Bf1 0-0 9. d4 Bf6 10. Re1 Nf5 11. c3 d5 12. Bf4 Be6 13. Nd2 a5 14. Qc2 c5 15. Bd3 g6 16. dxc5 Rc8 17. Nf3 Rxc5 18. Qd2 h5 19. Bg5 d4 20. Bxf5 Rxf5 21. Bxf6 Qxf6 22. Nxd4 1/2-1/2

[Event "Sofia MGU op 196th"]
[Site "Sofia"]
[Date "2017.11.12"]
[Round "5"]
[White "Kostov, Nikolai"]
[Black "Gelemerov, Yane"]
[Result "1-0"]
[ECO "A55"]
[WhiteElo "1631"]
[BlackElo "1918"]
[PlyCount "75"]
[EventDate "2017.11.11"]
[EventType "swiss"]
[EventRounds "6"]
[EventCountry "BUL"]
[SourceTitle "CBM 181 Extra"]
[Source "ChessBase"]
[SourceDate "2017.12.12"]
[SourceVersion "1"]
[SourceVersionDate "2017.12.12"]
[SourceQuality "1"]

1. d4 Nf6 2. c4 d6 3. Nf3 Nbd7 4. Nc3 e5 5. e4 Be7 6. h3 0-0 7. Be3 c6 8. Be2 Qc7 9. 0-0 Re8 10. Rc1 exd4 11. Nxd4 Bf8 12. Qc2 Nc5 13. Bf3 a5 14. Bf4 Ne6 15. Nxe6 fxe6 16. c5 e5 17. cxd6 Bxd6 18. Bg3 Qe7 19. Na4 Be6 20. Nb6 Ra6 21. Nc4 Bf7 22. Nxd6 Qxd6 23. Rfd1 Qe6 24. Be2 b5 25. a4 Rb6 26. axb5 cxb5 27. f3 Nh5 28. Bf2 Rbb8 29. Qc6 Nf4 30. Bf1 a4 31. Rd6 Qb3 32. Ba7 Ra8 33. Bb6 b4 34. Rcd1 Qxb2 35. Qxa8 Rxa8 36. Rd8+ Rxd8 37. Rxd8+ Be8 38. Bc4+ 1-0

[Event "Sofia MGU op 196th"]
[Site "Sofia"]
[Date "2017.11.12"]
[Round "4"]
[White "Kostov, Nikolai"]
[Black "Simeonov, Daniel"]
[Result "1-0"]
[ECO "D10"]
[WhiteElo "1631"]
[BlackElo "1576"]
[PlyCount "69"]
[EventDate "2017.11.11"]
[EventType "swiss"]
[EventRounds "6"]
[EventCountry "BUL"]
[SourceTitle "CBM 181 Extra"]
[Source "ChessBase"]
[SourceDate "2017.12.12"]
[SourceVersion "1"]
[SourceVersionDate "2017.12.12"]
[SourceQuality "1"]

1. d4 d5 2. c4 c6 3. e3 Nf6 4. Nc3 b6 5. cxd5 cxd5 6. f4 Ba6 7. Bxa6 Nxa6 8. Qa4+ Qd7 9. Qxa6 g6 10. Qb5 Bg7 11. Nf3 Qxb5 12. Nxb5 0-0 13. Nc3 Rfd8 14. Ne5 Ne8 15. 0-0 Rac8 16. Bd2 f6 17. Nd3 e6 18. a4 Nd6 19. b3 a6 20. Rac1 Rd7 21. Nf2 Nb7 22. Na2 Rb8 23. Rc6 Nd8 24. Rc2 Bf8 25. Bb4 Bg7 26. Rfc1 Rbb7 27. Rc8 Kf7 28. e4 e5 29. fxe5 fxe5 30. exd5 exd4 31. Ne4 Be5 32. Rf1+ Kg7 33. Bf8+ Kg8 34. Bh6 Rxd5 35. Rf8# 1-0

[Event "Sofia MGU op 196th"]
[Site "Sofia"]
[Date "2017.11.11"]
[Round "3"]
[White "Ignatov, Bojidar"]
[Black "Kostov, Nikolai"]
[Result "1-0"]
[ECO "C11"]
[WhiteElo "1788"]
[BlackElo "1631"]
[PlyCount "63"]
[EventDate "2017.11.11"]
[EventType "swiss"]
[EventRounds "6"]
[EventCountry "BUL"]
[SourceTitle "CBM 181 Extra"]
[Source "ChessBase"]
[SourceDate "2017.12.12"]
[SourceVersion "1"]
[SourceVersionDate "2017.12.12"]
[SourceQuality "1"]

1. e4 e6 2. d4 d5 3. Nc3 Nf6 4. e5 Nfd7 5. f4 c5 6. Nf3 a6 7. Ne2 cxd4 8. Nexd4 Nc6 9. c3 Be7 10. Be3 0-0 11. Rc1 Nxd4 12. Bxd4 Nb8 13. Bd3 Nc6 14. h4 Nxd4 15. Nxd4 Bxh4+ 16. Kf1 g6 17. Qg4 Be7 18. Qh3 h5 19. g4 Kg7 20. gxh5 Rh8 21. Qg4 Rh6 22. Ke2 Qe8 23. hxg6 f5 24. exf6+ Bxf6 25. Rxh6 Kxh6 26. Rh1+ Kg7 27. Rh7+ Kg8 28. Qg2 Bxd4 29. cxd4 e5 30. Qxd5+ Be6 31. Qxe5 Bxa2 32. Rh8# 1-0

[Event "Sofia MGU op 196th"]
[Site "Sofia"]
[Date "2017.11.11"]
[Round "2"]
[White "Kostov, Nikolai"]
[Black "Georgiev, Nikolay"]
[Result "1-0"]
[ECO "D00"]
[WhiteElo "1631"]
[BlackElo "1588"]
[PlyCount "63"]
[EventDate "2017.11.11"]
[EventType "swiss"]
[EventRounds "6"]
[EventCountry "BUL"]
[SourceTitle "CBM 181 Extra"]
[Source "ChessBase"]
[SourceDate "2017.12.12"]
[SourceVersion "1"]
[SourceVersionDate "2017.12.12"]
[SourceQuality "1"]

1. d4 d5 2. e3 Nf6 3. Bd3 Bg4 4. f3 Bh5 5. Ne2 Nbd7 6. Nf4 Bg6 7. Nxg6 hxg6 8. c4 e5 9. c5 c6 10. Nc3 Nh5 11. Kd2 exd4 12. exd4 Qg5+ 13. Kc2 Qxg2+ 14. Qe2+ Qxe2+ 15. Nxe2 Be7 16. b4 a6 17. a4 Nhf6 18. Bd2 Nf8 19. b5 N6d7 20. bxc6 bxc6 21. Bf4 Ne6 22. Bg3 Bh4 23. Bd6 Be7 24. Bg3 Bf6 25. Rhe1 0-0 26. Bf2 Rfb8 27. Rab1 a5 28. Red1 Rxb1 29. Rxb1 Rb8 30. Rxb8+ Nxb8 31. f4 Na6 32. Bxa6 1-0

[Event "Sofia MGU op 196th"]
[Site "Sofia"]
[Date "2017.11.11"]
[Round "1"]
[White "Metev, Martin"]
[Black "Kostov, Nikolai"]
[Result "1-0"]
[ECO "C47"]
[WhiteElo "1892"]
[BlackElo "1631"]
[PlyCount "115"]
[EventDate "2017.11.11"]
[EventType "swiss"]
[EventRounds "6"]
[EventCountry "BUL"]
[SourceTitle "CBM 181 Extra"]
[Source "ChessBase"]
[SourceDate "2017.12.12"]
[SourceVersion "1"]
[SourceVersionDate "2017.12.12"]
[SourceQuality "1"]

1. e4 e5 2. Nf3 Nc6 3. Nc3 Nf6 4. d4 exd4 5. Nxd4 Bc5 6. Nxc6 bxc6 7. Bd3 d6 8. 0-0 h6 9. Na4 Bb6 10. Nxb6 axb6 11. Re1 0-0 12. b3 Ng4 13. h3 Ne5 14. Bf1 Qf6 15. Be3 Qg6 16. f4 Nd7 17. Bd3 Nc5 18. Bxc5 dxc5 19. Qf3 f5 20. e5 b5 21. a4 c4 22. Bf1 cxb3 23. cxb3 Bd7 24. axb5 Rxa1 25. Rxa1 cxb5 26. Qd5+ Be6 27. Qxb5 Qg3 28. Bc4 Qe3+ 29. Kh1 Bxc4 30. Qxc4+ Kh7 31. Rf1 c5 32. Kh2 h5 33. Rf3 Qe1 34. Qxc5 Rd8 35. Qe3 Qb1 36. Kg3 Rd1 37. e6 Re1 38. Qd3 Qxd3 39. Rxd3 Rxe6 40. b4 Rb6 41. Rb3 Rb5 42. Kf3 h4 43. Ke3 g5 44. fxg5 Kg6 45. Kf4 Kh5 46. Rb2 Kg6 47. Ke3 Kxg5 48. Kd4 Kf4 49. Kc4 Rb8 50. Rf2+ Ke4 51. b5 Rc8+ 52. Kb4 f4 53. b6 Rg8 54. Kb5 Ke3 55. Rc2 Rg5+ 56. Kb4 Rg6 57. Ka5 Rg5+ 58. Ka6 1-0

[Event "Sofia MGU op 195th"]
[Site "Sofia"]
[Date "2017.11.05"]
[Round "4"]
[White "Kostov, Nikolai"]
[Black "Andreev, Dobrotich"]
[Result "0-1"]
[ECO "D36"]
[WhiteElo "1631"]
[BlackElo "1829"]
[PlyCount "116"]
[EventDate "2017.11.04"]
[EventType "swiss"]
[EventRounds "6"]
[EventCountry "BUL"]
[SourceTitle "CBM 181 Extra"]
[Source "ChessBase"]
[SourceDate "2017.12.12"]
[SourceVersion "1"]
[SourceVersionDate "2017.12.12"]
[SourceQuality "1"]

1. Nf3 d5 2. d4 Nf6 3. c4 e6 4. a3 c6 5. cxd5 exd5 6. Bg5 Be7 7. e3 0-0 8. Nc3 Nbd7 9. Bd3 Re8 10. 0-0 Ne4 11. Bxe7 Qxe7 12. Qc2 Nf8 13. Bxe4 dxe4 14. Nd2 Bf5 15. b4 a6 16. Nc4 Qg5 17. Kh1 Re6 18. Qd2 Rh6 19. f4 Qh5 20. g3 Nd7 21. Ne5 Nf6 22. Qe2 Qh3 23. Kg1 Ng4 24. Nxg4 Bxg4 25. Qf2 f5 26. Na4 Qh5 27. Nb6 Rd8 28. Nc4 Be2 29. Rfc1 Bxc4 30. Rxc4 Qf7 31. Rc5 Rhd6 32. Rac1 g6 33. Qc2 Qe6 34. Qc4 Kf7 35. Qxe6+ Kxe6 36. a4 Kd7 37. b5 axb5 38. axb5 Ra8 39. bxc6+ Rxc6 40. Rxc6 bxc6 41. Rc2 Kd6 42. Kf2 Ra5 43. h4 Kd5 44. Rb2 c5 45. dxc5 Rxc5 46. Rd2+ Kc4 47. Rc2+ Kb4 48. Rd2 Kc3 49. Ra2 Rb5 50. h5 Rb2+ 51. Rxb2 Kxb2 52. g4 Kc2 53. hxg6 hxg6 54. gxf5 gxf5 55. Ke2 Kc3 56. Ke1 Kd3 57. Kf2 Kd2 58. Kf1 Kxe3 0-1

[Event "Sofia MGU op 195th"]
[Site "Sofia"]
[Date "2017.11.05"]
[Round "5"]
[White "Mladenov, Andrey"]
[Black "Kostov, Nikolai"]
[Result "1-0"]
[ECO "C14"]
[WhiteElo "1552"]
[BlackElo "1631"]
[PlyCount "89"]
[EventDate "2017.11.04"]
[EventType "swiss"]
[EventRounds "6"]
[EventCountry "BUL"]
[SourceTitle "CBM 181 Extra"]
[Source "ChessBase"]
[SourceDate "2017.12.12"]
[SourceVersion "1"]
[SourceVersionDate "2017.12.12"]
[SourceQuality "1"]

1. e4 e6 2. d4 d5 3. Nc3 Nf6 4. Bg5 Be7 5. e5 Nfd7 6. Bxe7 Qxe7 7. f4 c5 8. Nb5 Qd8 9. Nd6+ Kf8 10. Qh5 g6 11. Qh6+ Kg8 12. Nf3 f6 13. 0-0-0 c4 14. Nh4 Nf8 15. exf6 Qxf6 16. Nxc8 Nc6 17. Nd6 Qe7 18. Nb5 a6 19. Nc3 Nd8 20. Qg5 Qf7 21. Nf3 h6 22. Qg3 Kh7 23. Ne5 Qe8 24. h4 Nc6 25. h5 Nxe5 26. fxe5 gxh5 27. Qf3 Rg8 28. Qxh5 Qxh5 29. Rxh5 b5 30. Rd2 Ng6 31. Rh3 Raf8 32. Rf3 Rxf3 33. gxf3 Rf8 34. Rf2 Rf4 35. Ne2 Rh4 36. f4 Ne7 37. Ng3 Kg6 38. Kd2 Nf5 39. Nxf5 Kxf5 40. Ke3 Rh1 41. Rf3 Kg4 42. f5 exf5 43. e6 f4+ 44. Rxf4+ Kg5 45. e7 1-0

[Event "Sofia MGU op 195th"]
[Site "Sofia"]
[Date "2017.11.04"]
[Round "2"]
[White "Gelemerov, Yane"]
[Black "Kostov, Nikolai"]
[Result "1-0"]
[ECO "C28"]
[WhiteElo "1918"]
[BlackElo "1631"]
[PlyCount "75"]
[EventDate "2017.11.04"]
[EventType "swiss"]
[EventRounds "6"]
[EventCountry "BUL"]
[SourceTitle "CBM 181 Extra"]
[Source "ChessBase"]
[SourceDate "2017.12.12"]
[SourceVersion "1"]
[SourceVersionDate "2017.12.12"]
[SourceQuality "1"]

1. e4 e5 2. Bc4 Nf6 3. Nc3 Nc6 4. d3 h6 5. f4 Bb4 6. Nf3 d6 7. 0-0 Bc5+ 8. Kh1 Bg4 9. Bb5 a6 10. Bxc6+ bxc6 11. fxe5 dxe5 12. Qe1 Bxf3 13. Rxf3 0-0 14. Qg3 Qd6 15. Rf5 Nd7 16. Bd2 Qg6 17. Qh3 Rfd8 18. Raf1 f6 19. R1f3 Kf7 20. Rh5 Bf8 21. Be3 Ke8 22. Qe6+ Be7 23. Rhh3 c5 24. Nd5 Qf7 25. Nxc7+ Kf8 26. Qxf7+ Kxf7 27. Nxa8 Rxa8 28. Rf1 Rb8 29. b3 Nf8 30. Rhf3 Nd7 31. h4 Rb7 32. g4 Kg6 33. Kg2 Nb8 34. g5 Kh5 35. gxh6 gxh6 36. Rg3 Nc6 37. Kh3 Nd4 38. Bxd4 1-0

[Event "Sofia MGU op 195th"]
[Site "Sofia"]
[Date "2017.11.04"]
[Round "1"]
[White "Kostov, Nikolai"]
[Black "Dimova, Mariya"]
[Result "1-0"]
[ECO "D00"]
[WhiteElo "1631"]
[BlackElo "1434"]
[PlyCount "77"]
[EventDate "2017.11.04"]
[EventType "swiss"]
[EventRounds "6"]
[EventCountry "BUL"]
[SourceTitle "CBM 181 Extra"]
[Source "ChessBase"]
[SourceDate "2017.12.12"]
[SourceVersion "1"]
[SourceVersionDate "2017.12.12"]
[SourceQuality "1"]

1. d4 d5 2. e3 Nf6 3. Bd3 Nc6 4. f4 Bg4 5. Nf3 e5 6. fxe5 Ne4 7. 0-0 Be7 8. c4 0-0 9. cxd5 Ng5 10. dxc6 Nxf3+ 11. gxf3 Bh3 12. cxb7 Rb8 13. Nc3 Bh4 14. f4 g5 15. Qh5 f5 16. Qf3 g4 17. Qd5+ Qxd5 18. Nxd5 Rxb7 19. b3 c6 20. Nf6+ Bxf6 21. exf6 Rxf6 22. Rf2 h5 23. Bb2 h4 24. Bc4+ Kh7 25. d5 Rg6 26. dxc6 Re7 27. Be5 Rxc6 28. Rd1 g3 29. Rc2 Rg6 30. Rd8 gxh2+ 31. Kxh2 Rxe5 32. fxe5 Rg3 33. e6 Rxe3 34. e7 Bg4 35. e8Q Rh3+ 36. Kg1 Rg3+ 37. Rg2 Rxg2+ 38. Kxg2 h3+ 39. Kh2 1-0

[Event "Sofia MGU op 195th"]
[Site "Sofia"]
[Date "2017.11.04"]
[Round "3"]
[White "Kostov, Nikolai"]
[Black "Simeonov, Daniel"]
[Result "1-0"]
[ECO "A42"]
[WhiteElo "1631"]
[BlackElo "1576"]
[PlyCount "93"]
[EventDate "2017.11.04"]
[EventType "swiss"]
[EventRounds "6"]
[EventCountry "BUL"]
[SourceTitle "CBM 181 Extra"]
[Source "ChessBase"]
[SourceDate "2017.12.12"]
[SourceVersion "1"]
[SourceVersionDate "2017.12.12"]
[SourceQuality "1"]

1. d4 g6 2. c4 Bg7 3. Nc3 c6 4. e4 d6 5. Be3 e6 6. Qd2 b6 7. Nf3 Bb7 8. g4 Nd7 9. 0-0-0 Qc7 10. Kb1 0-0-0 11. h4 h6 12. Rc1 Kb8 13. Be2 Ne7 14. Bf4 e5 15. Bg3 Ka8 16. b4 f5 17. gxf5 gxf5 18. Rhg1 Bf6 19. d5 Nf8 20. dxc6 Bxc6 21. Nd5 Bxd5 22. cxd5 Qd7 23. Bd3 fxe4 24. Bxe4 Nfg6 25. Qd3 Nf4 26. Bxf4 exf4 27. Nd4 Qa4 28. Qb3 Qxb3+ 29. Nxb3 Kb7 30. h5 Rhg8 31. Nd2 Bd4 32. Rxg8 Rxg8 33. Nc4 Nc8 34. Bf5 Be5 35. f3 Ne7 36. Be6 Rg2 37. Nxe5 dxe5 38. d6 Nc6 39. Bd5 Rd2 40. Bxc6+ Kc8 41. d7+ Kd8 42. Rg1 Kc7 43. b5 e4 44. Bxe4 Rxd7 45. Rg6 Kd8 46. Rxh6 Rf7 47. Rh7 1-0

[Event "Sofia MGU op 193rd"]
[Site "Sofia"]
[Date "2017.10.22"]
[Round "6"]
[White "Babatov, Martin"]
[Black "Kostov, Nikolai"]
[Result "0-1"]
[ECO "A60"]
[WhiteElo "1755"]
[BlackElo "1646"]
[PlyCount "22"]
[EventDate "2017.10.21"]
[EventType "swiss"]
[EventRounds "6"]
[EventCountry "BUL"]
[SourceTitle "CBM 181 Extra"]
[Source "ChessBase"]
[SourceDate "2017.12.12"]
[SourceVersion "1"]
[SourceVersionDate "2017.12.12"]
[SourceQuality "1"]

1. d4 Nf6 2. c4 c5 3. d5 e6 4. Nc3 exd5 5. Nxd5 Nxd5 6. cxd5 d6 7. Nf3 Be7 8. e3 0-0 9. Bc4 Bf6 10. Qc2 b5 11. Bxb5 Qa5+ 0-1

[Event "Sofia MGU op 193rd"]
[Site "Sofia"]
[Date "2017.10.22"]
[Round "4"]
[White "Kostov, Nikolai"]
[Black "Metev, Martin"]
[Result "0-1"]
[ECO "C02"]
[WhiteElo "1646"]
[BlackElo "1907"]
[PlyCount "76"]
[EventDate "2017.10.21"]
[EventType "swiss"]
[EventRounds "6"]
[EventCountry "BUL"]
[SourceTitle "CBM 181 Extra"]
[Source "ChessBase"]
[SourceDate "2017.12.12"]
[SourceVersion "1"]
[SourceVersionDate "2017.12.12"]
[SourceQuality "1"]

1. d4 e6 2. e4 d5 3. e5 c5 4. c3 Nc6 5. Nf3 Qb6 6. Qb3 Qxb3 7. axb3 cxd4 8. cxd4 Bb4+ 9. Bd2 Bxd2+ 10. Nbxd2 Nge7 11. Bd3 Nb4 12. Bb1 Bd7 13. 0-0 Bb5 14. Re1 h6 15. Re3 Kd7 16. Ne1 Rhc8 17. Rc3 Rc6 18. Rxc6 Nexc6 19. Ndf3 b6 20. Bc2 Na5 21. Bd1 Rc8 22. h3 f6 23. g4 a6 24. Kh2 Bd3 25. Kg3 Be4 26. Be2 Nxb3 27. Ra3 Na5 28. Ra4 Bxf3 29. Kxf3 Nc2 30. Nxc2 Rxc2 31. b4 Nc6 32. Ke3 fxe5 33. Rxa6 exd4+ 34. Kf3 Ne5+ 35. Kg3 Rxe2 36. Ra7+ Kc6 37. Rxg7 d3 38. f4 d2 0-1

[Event "Sofia MGU op 193rd"]
[Site "Sofia"]
[Date "2017.10.21"]
[Round "1"]
[White "Kostov, Nikolai"]
[Black "Daskalov, Emil"]
[Result "0-1"]
[ECO "E10"]
[WhiteElo "1646"]
[BlackElo "2004"]
[PlyCount "112"]
[EventDate "2017.10.21"]
[EventType "swiss"]
[EventRounds "6"]
[EventCountry "BUL"]
[SourceTitle "CBM 181 Extra"]
[Source "ChessBase"]
[SourceDate "2017.12.12"]
[SourceVersion "1"]
[SourceVersionDate "2017.12.12"]
[SourceQuality "1"]

1. d4 Nf6 2. e3 e6 3. c4 c5 4. Nf3 Qc7 5. Nc3 a6 6. Bd3 Be7 7. 0-0 d6 8. h3 0-0 9. e4 Nc6 10. Be3 cxd4 11. Bxd4 Nxd4 12. Nxd4 Rd8 13. Rc1 g6 14. Bb1 Nh5 15. Nce2 e5 16. Nf3 Be6 17. b3 Rac8 18. g4 Ng7 19. Nc3 h5 20. Nh2 Bg5 21. Rc2 hxg4 22. hxg4 Qa5 23. Nd5 Bxd5 24. Qxd5 Qxd5 25. cxd5 Rxc2 26. Bxc2 Rc8 27. Bd3 Rc3 28. Rd1 Ne8 29. Kf1 Nf6 30. f3 Bf4 31. Kg2 Nh7 32. Nf1 g5 33. Ng3 Bxg3 34. Kxg3 Nf8 35. Kf2 Ng6 36. Rd2 Nf4 37. Be2 Kf8 38. Rb2 Ke7 39. a4 Kd7 40. b4 Kc7 41. Bf1 Nd3+ 42. Bxd3 Rxd3 43. a5 Rc3 44. Ke2 b6 45. Kf2 bxa5 46. bxa5 Ra3 47. Rc2+ Kd7 48. Rb2 Rxa5 49. Rb7+ Ke8 50. Rb8+ Ke7 51. Rb7+ Kf8 52. Rd7 Ra2+ 53. Ke3 a5 54. Rxd6 a4 55. Ra6 Ra1 56. d6 Ke8 0-1

[Event "Sofia MGU op 193rd"]
[Site "Sofia"]
[Date "2017.10.21"]
[Round "2"]
[White "Simov, Zahari"]
[Black "Kostov, Nikolai"]
[Result "0-1"]
[ECO "A26"]
[WhiteElo "1489"]
[BlackElo "1646"]
[PlyCount "82"]
[EventDate "2017.10.21"]
[EventType "swiss"]
[EventRounds "6"]
[EventCountry "BUL"]
[SourceTitle "CBM 181 Extra"]
[Source "ChessBase"]
[SourceDate "2017.12.12"]
[SourceVersion "1"]
[SourceVersionDate "2017.12.12"]
[SourceQuality "1"]

1. c4 e5 2. Nc3 Nc6 3. g3 d6 4. d3 g6 5. Bg2 Bg7 6. Nf3 h6 7. 0-0 Nge7 8. Rb1 a5 9. Bd2 Be6 10. Ne1 0-0 11. a3 Rb8 12. b4 axb4 13. axb4 d5 14. c5 b5 15. Qc1 Kh7 16. Nc2 Qd7 17. Na3 Na7 18. Nc2 Bh3 19. Nd1 Bxg2 20. Kxg2 Nac6 21. e3 f5 22. f3 Rbd8 23. Nf2 e4 24. d4 exf3+ 25. Kxf3 Ng8 26. Kg2 Nf6 27. Qd1 Ne4 28. Nxe4 fxe4 29. Qe2 Rf3 30. Rxf3 exf3+ 31. Qxf3 Rf8 32. Qe2 Qf5 33. Na3 Qe4+ 34. Kg1 Nxd4 35. Qg2 Nf3+ 36. Kh1 Qd3 37. Rf1 Nxd2 38. Rxf8 Bxf8 39. h3 c6 40. Kh2 Bg7 41. h4 Nf1+ 0-1

[Event "Sofia MGU op 192nd"]
[Site "Sofia"]
[Date "2017.10.08"]
[Round "4"]
[White "Andreev, Dobrotich"]
[Black "Kostov, Nikolai"]
[Result "1-0"]
[ECO "C67"]
[WhiteElo "1844"]
[BlackElo "1646"]
[PlyCount "81"]
[EventDate "2017.10.07"]
[EventType "swiss"]
[EventRounds "6"]
[EventCountry "BUL"]
[SourceTitle "CBM 181 Extra"]
[Source "ChessBase"]
[SourceDate "2017.12.12"]
[SourceVersion "1"]
[SourceVersionDate "2017.12.12"]
[SourceQuality "1"]

1. e4 e5 2. Nf3 Nc6 3. Bb5 Nf6 4. 0-0 Nxe4 5. d4 Be7 6. dxe5 0-0 7. Qd5 Ng5 8. Bxg5 Bxg5 9. e6 Bf6 10. exf7+ Kh8 11. c3 Ne7 12. Qb3 c6 13. Bd3 d5 14. Qc2 g6 15. Re1 Rxf7 16. Nbd2 Bf5 17. Ne5 Bxe5 18. Rxe5 Bxd3 19. Qxd3 Qf8 20. Rae1 Nf5 21. Nf3 Re7 22. Rxe7 Nxe7 23. Qd4+ Kg8 24. Re6 Nf5 25. Qe5 Ng7 26. Rf6 Qe8 27. Qc7 Rc8 28. Qxb7 Rb8 29. Qxa7 Rxb2 30. g3 Nf5 31. Ne5 Rb1+ 32. Kg2 Re1 33. f4 Re2+ 34. Kh3 Ne3 35. Rxc6 Nf1 36. Qa6 Rxh2+ 37. Kg4 Ne3+ 38. Kf3 Nd1 39. Rc8 Rf2+ 40. Kg4 Kg7 41. Rxe8 1-0

[Event "Sofia MGU op 192nd"]
[Site "Sofia"]
[Date "2017.10.08"]
[Round "6"]
[White "Kostov, Nikolai"]
[Black "Babatov, Martin"]
[Result "0-1"]
[ECO "B18"]
[WhiteElo "1646"]
[BlackElo "1755"]
[PlyCount "112"]
[EventDate "2017.10.07"]
[EventType "swiss"]
[EventRounds "6"]
[EventCountry "BUL"]
[SourceTitle "CBM 181 Extra"]
[Source "ChessBase"]
[SourceDate "2017.12.12"]
[SourceVersion "1"]
[SourceVersionDate "2017.12.12"]
[SourceQuality "1"]

1. d4 c6 2. e4 d5 3. Nc3 dxe4 4. Nxe4 Bf5 5. Bd3 e6 6. Ne2 Be7 7. N4g3 Bxd3 8. Qxd3 Nf6 9. 0-0 0-0 10. Rd1 Nbd7 11. c4 Qc7 12. Qc2 Rac8 13. Bf4 Bd6 14. Bxd6 Qxd6 15. Qb3 Rc7 16. h3 Rd8 17. a4 Nf8 18. Qc3 c5 19. dxc5 Qxd1+ 20. Rxd1 Rxd1+ 21. Kh2 Rxc5 22. b4 Rc7 23. b5 b6 24. a5 bxa5 25. Qb3 Rd8 26. Nf1 Ne4 27. f3 Nd2 28. Nxd2 Rxd2 29. Ng3 Rd4 30. b6 axb6 31. Qxb6 Rcxc4 32. Qxa5 Rc2 33. Qa8 Rdd2 34. f4 Rxg2+ 35. Qxg2 Rxg2+ 36. Kxg2 Ng6 37. Kf3 Ne7 38. Kg4 g6 39. Kf3 Kg7 40. Ke4 Nc6 41. Kf3 f5 42. Ke3 Kf6 43. Ne2 e5 44. fxe5+ Nxe5 45. h4 h6 46. Kf4 g5+ 47. hxg5+ hxg5+ 48. Kg3 Ng6 49. Kf3 Ke5 50. Kg3 Ke4 51. Nc3+ Kd4 52. Nd1 Ne5 53. Nf2 f4+ 54. Kg2 g4 55. Nxg4 Nxg4 56. Kf3 Ke5 0-1

[Event "Sofia MGU op 192nd"]
[Site "Sofia"]
[Date "2017.10.08"]
[Round "5"]
[White "Kostov, Nikolai"]
[Black "Mihalev, Daniil"]
[Result "0-1"]
[ECO "A45"]
[WhiteElo "1646"]
[BlackElo "1727"]
[PlyCount "110"]
[EventDate "2017.10.07"]
[EventType "swiss"]
[EventRounds "6"]
[EventCountry "BUL"]
[SourceTitle "CBM 181 Extra"]
[Source "ChessBase"]
[SourceDate "2017.12.12"]
[SourceVersion "1"]
[SourceVersionDate "2017.12.12"]
[SourceQuality "1"]

1. d4 e6 2. e3 b6 3. f4 Bb7 4. Nf3 Nf6 5. Bd3 c5 6. c3 d6 7. 0-0 Be7 8. Qe2 Ne4 9. Nbd2 d5 10. Nxe4 dxe4 11. Bb5+ Kf8 12. Nd2 a6 13. Ba4 f5 14. g4 g6 15. Bc2 Nc6 16. Rf2 Rc8 17. Nf1 Kf7 18. gxf5 exf5 19. Rg2 cxd4 20. Bb3+ Kg7 21. cxd4 Qd6 22. Ng3 Rhf8 23. a3 Na5 24. Ba2 Bd5 25. Bxd5 Qxd5 26. Bd2 Nb3 27. Rb1 Qc4 28. Qxc4 Rxc4 29. Be1 Kf7 30. Ne2 Rfc8 31. Nc3 Rd8 32. Kf1 b5 33. Rd1 Rd7 34. h4 h5 35. Na2 a5 36. Ke2 Rdc7 37. Nc3 Rb7 38. a4 b4 39. Nb5 Nc1+ 40. Kf1 Nd3 41. b3 Rc8 42. Rb1 Rb6 43. Rh2 Rbc6 44. Bd2 Rc2 45. Kg1 Ra2 46. Be1 Rxh2 47. Kxh2 Rc2+ 48. Kg1 Re2 49. Kf1 Rxe3 50. d5 Rf3+ 51. Ke2 Nxf4+ 52. Kd1 Rd3+ 53. Kc2 Nxd5 54. Kb2 Bf6+ 55. Ka2 Nc3+ 0-1

[Event "Sofia MGU op 192nd"]
[Site "Sofia"]
[Date "2017.10.07"]
[Round "2"]
[White "Kostov, Nikolai"]
[Black "Dimova, Mariya"]
[Result "1-0"]
[ECO "D00"]
[WhiteElo "1646"]
[PlyCount "61"]
[EventDate "2017.10.07"]
[EventType "swiss"]
[EventRounds "6"]
[EventCountry "BUL"]
[SourceTitle "CBM 181 Extra"]
[Source "ChessBase"]
[SourceDate "2017.12.12"]
[SourceVersion "1"]
[SourceVersionDate "2017.12.12"]
[SourceQuality "1"]

1. d4 d5 2. e3 Bd7 3. f4 e6 4. Nf3 Bd6 5. Bd3 Nf6 6. Nbd2 Nc6 7. c3 Ne7 8. Ne5 0-0 9. 0-0 Be8 10. Rf3 Bxe5 11. fxe5 Ng4 12. Rh3 Nh6 13. g4 f5 14. exf6 Ng6 15. fxg7 Kxg7 16. Nf1 Rf6 17. e4 Ng8 18. e5 Rf8 19. Ng3 Nh4 20. Nh5+ Kh8 21. Bd2 Bxh5 22. gxh5 Rf7 23. Rg3 Qe7 24. Bg5 Nf3+ 25. Rxf3 Qxg5+ 26. Rg3 Qh4 27. Qg4 Qe7 28. Rf1 Nh6 29. Qg5 Qf8 30. Rxf7 Nxf7 31. Qf6+ 1-0

[Event "Sofia MGU op 192nd"]
[Site "Sofia"]
[Date "2017.10.07"]
[Round "1"]
[White "Metev, Martin"]
[Black "Kostov, Nikolai"]
[Result "1-0"]
[ECO "B10"]
[WhiteElo "1907"]
[BlackElo "1646"]
[PlyCount "45"]
[EventDate "2017.10.07"]
[EventType "swiss"]
[EventRounds "6"]
[EventCountry "BUL"]
[SourceTitle "CBM 181 Extra"]
[Source "ChessBase"]
[SourceDate "2017.12.12"]
[SourceVersion "1"]
[SourceVersionDate "2017.12.12"]
[SourceQuality "1"]

1. e4 e5 2. c4 d6 3. Nc3 c6 4. d3 Be7 5. g3 Nf6 6. Bg2 Na6 7. Nge2 0-0 8. 0-0 Nc7 9. d4 a6 10. f4 exd4 11. Nxd4 Ne6 12. Nf5 Nc5 13. Nxe7+ Qxe7 14. Re1 Bg4 15. Qc2 a5 16. h3 Bc8 17. Be3 Nfd7 18. Rad1 Qf6 19. Qd2 Qg6 20. Bf2 a4 21. Qxd6 Qxd6 22. Rxd6 f6 23. e5 1-0

[Event "Sofia MGU op 192nd"]
[Site "Sofia"]
[Date "2017.10.07"]
[Round "3"]
[White "Simeonov, Daniel"]
[Black "Kostov, Nikolai"]
[Result "1/2-1/2"]
[ECO "B14"]
[WhiteElo "1528"]
[BlackElo "1646"]
[PlyCount "62"]
[EventDate "2017.10.07"]
[EventType "swiss"]
[EventRounds "6"]
[EventCountry "BUL"]
[SourceTitle "CBM 181 Extra"]
[Source "ChessBase"]
[SourceDate "2017.12.12"]
[SourceVersion "1"]
[SourceVersionDate "2017.12.12"]
[SourceQuality "1"]

1. d4 Nf6 2. c4 c5 3. e3 e6 4. Nc3 cxd4 5. exd4 Bb4 6. Bd2 Nc6 7. Nf3 d5 8. a3 Bxc3 9. Bxc3 Ne4 10. cxd5 Qxd5 11. Be2 0-0 12. 0-0 Nxc3 13. bxc3 b5 14. Bd3 Bb7 15. Re1 f5 16. Re3 Rf6 17. Rc1 Rh6 18. c4 bxc4 19. Bxc4 Qd6 20. d5 Na5 21. Ba2 exd5 22. h3 Kf8 23. Qa4 Nc4 24. Bxc4 dxc4 25. Rce1 Qc6 26. Qb4+ Rd6 27. Qc3 Rd3 28. Rxd3 cxd3 29. Qxd3 g6 30. Qe3 Re8 31. Qh6+ Kg8 1/2-1/2

[Event "Sofia MGU op 191st"]
[Site "Sofia"]
[Date "2017.10.01"]
[Round "4"]
[White "Dimova, Mariya"]
[Black "Kostov, Nikolai"]
[Result "1-0"]
[ECO "C44"]
[BlackElo "1648"]
[PlyCount "103"]
[EventDate "2017.09.30"]
[EventType "swiss"]
[EventRounds "6"]
[EventCountry "BUL"]
[SourceTitle "EXT 2018"]
[Source "ChessBase"]
[SourceDate "2017.10.13"]
[SourceVersion "1"]
[SourceVersionDate "2017.10.13"]
[SourceQuality "1"]

1. e4 e5 2. Nf3 Nc6 3. Be2 g6 4. c3 Bg7 5. d3 Nf6 6. Nbd2 d5 7. Qa4 0-0 8. 0-0 a6 9. Qc2 Re8 10. Re1 h6 11. Nf1 Kh7 12. Bd2 Be6 13. Rad1 b5 14. Kh1 Ng4 15. Kg1 f5 16. h3 Nf6 17. Ng3 f4 18. Nh1 dxe4 19. dxe4 Qe7 20. Nh4 Nd7 21. Nf5 Qf7 22. g4 Kh8 23. Bc1 gxf5 24. exf5 Bxa2 25. Rd2 Rad8 26. Bf3 Bb3 27. Qe4 Ne7 28. Qb1 Bd5 29. Bxd5 Nxd5 30. Qa2 N7b6 31. Qxa6 h5 32. f3 Rd6 33. Rg2 Qd7 34. Nf2 Ra8 35. Qb7 Qc6 36. Qxc6 Rxc6 37. Ne4 Ne7 38. Ng5 Bf6 39. h4 hxg4 40. fxg4 Nd7 41. Ne4 Ra1 42. g5 Nxf5 43. gxf6 Nxf6 44. Ng5 Nd6 45. Kh2 b4 46. Rxe5 Rxc1 47. Re6 bxc3 48. Rxf6 cxb2 49. Rf8+ Kg7 50. Ne6+ Kh7 51. Rg7+ Kh6 52. Rh8# 1-0

[Event "Sofia MGU op 191st"]
[Site "Sofia"]
[Date "2017.10.01"]
[Round "5"]
[White "Kostov, Nikolai"]
[Black "Andreev, Dobrotich"]
[Result "0-1"]
[ECO "D04"]
[WhiteElo "1648"]
[BlackElo "1881"]
[PlyCount "108"]
[EventDate "2017.09.30"]
[EventType "swiss"]
[EventRounds "6"]
[EventCountry "BUL"]
[SourceTitle "EXT 2018"]
[Source "ChessBase"]
[SourceDate "2017.10.13"]
[SourceVersion "1"]
[SourceVersionDate "2017.10.13"]
[SourceQuality "1"]

1. d4 d5 2. e3 Nf6 3. Bd3 Bg4 4. Nf3 e6 5. 0-0 Be7 6. Nbd2 Nbd7 7. c4 Bxf3 8. Nxf3 c6 9. cxd5 exd5 10. Qc2 0-0 11. Ne5 h6 12. f4 c5 13. b3 cxd4 14. exd4 Rc8 15. Qe2 Qb6 16. Bb2 Bd6 17. Kh1 Rc7 18. g4 Rfc8 19. Nxd7 Rxd7 20. Bf5 Re7 21. Qg2 Rce8 22. g5 Re2 23. Rf2 Rxf2 24. Qxf2 Ne4 25. Bxe4 Rxe4 26. gxh6 Rxf4 27. Qg2 g6 28. h7+ Kxh7 29. Qh3+ Kg7 30. Rc1 Rf2 31. Qc3 Bf4 32. Rc2 Rxc2 33. Qxc2 Qc7 34. Qg2 Qe7 35. Qc2 Qe1+ 36. Kg2 Be3 37. Kf3 Bg5 38. Qe2 Qh1+ 39. Qg2 Qxg2+ 40. Kxg2 f5 41. Kf3 Kf6 42. h3 Bd2 43. Ba3 Kg5 44. Be7+ Kh5 45. a4 b5 46. axb5 a6 47. Bf6 axb5 48. Kg2 Bg5 49. Kf3 f4 50. Kg2 Bh4 51. Be5 Bf2 52. Bg7 Be3 53. Bf6 f3+ 54. Kf1 Bxd4 0-1

[Event "Sofia MGU op 191st"]
[Site "Sofia"]
[Date "2017.09.30"]
[Round "2"]
[White "Kostov, Nikolai"]
[Black "Babatov, Martin"]
[Result "1/2-1/2"]
[ECO "B12"]
[WhiteElo "1648"]
[BlackElo "1737"]
[PlyCount "97"]
[EventDate "2017.09.30"]
[EventType "swiss"]
[EventRounds "6"]
[EventCountry "BUL"]
[SourceTitle "EXT 2018"]
[Source "ChessBase"]
[SourceDate "2017.10.13"]
[SourceVersion "1"]
[SourceVersionDate "2017.10.13"]
[SourceQuality "1"]

1. d4 c6 2. e4 d5 3. e5 Bf5 4. g4 Bd7 5. Bd3 h5 6. gxh5 Nh6 7. Bxh6 Rxh6 8. Qf3 Qb6 9. Nd2 Qxd4 10. 0-0-0 Qxe5 11. Qg3 Qxg3 12. hxg3 g6 13. f3 Rxh5 14. Rxh5 gxh5 15. Ne2 Na6 16. Bxa6 bxa6 17. Rh1 Bg7 18. Rxh5 Rb8 19. c3 e5 20. Nb3 Ke7 21. Rh7 Bf6 22. f4 Bf5 23. Rh1 Bg4 24. Re1 Bxe2 25. Rxe2 Kd6 26. fxe5+ Bxe5 27. g4 Rg8 28. Rg2 f5 29. g5 Bf4+ 30. Kc2 Rxg5 31. Rxg5 Bxg5 32. Nd4 f4 33. Kd3 c5 34. Nf3 Bf6 35. b3 Kc6 36. c4 Kd6 37. cxd5 Kxd5 38. Nd2 a5 39. a4 Bd4 40. Nf3 Be3 41. Ne1 a6 42. Nf3 Bc1 43. Ng1 Ke5 44. Nf3+ Kf5 45. Nh2 Kg5 46. Ke4 Kh4 47. Kf3 Kg5 48. Ke4 Kh4 49. Kf3 1/2-1/2

[Event "Sofia MGU op 191st"]
[Site "Sofia"]
[Date "2017.09.30"]
[Round "3"]
[White "Tzonev, Kirjl"]
[Black "Kostov, Nikolai"]
[Result "1-0"]
[ECO "C66"]
[WhiteElo "1855"]
[BlackElo "1648"]
[PlyCount "61"]
[EventDate "2017.09.30"]
[EventType "swiss"]
[EventRounds "6"]
[EventCountry "BUL"]
[SourceTitle "EXT 2018"]
[Source "ChessBase"]
[SourceDate "2017.10.13"]
[SourceVersion "1"]
[SourceVersionDate "2017.10.13"]
[SourceQuality "1"]

1. e4 e5 2. Nf3 Nc6 3. Bb5 Nf6 4. d3 d6 5. h3 Be7 6. 0-0 0-0 7. Nc3 a6 8. Bxc6 bxc6 9. Re1 Ne8 10. d4 Bf6 11. dxe5 Be7 12. Bf4 f5 13. exd6 cxd6 14. e5 d5 15. Nd4 Qc7 16. Qf3 Qb7 17. a3 Bc5 18. Nb3 Bb6 19. Na4 Ba7 20. Rad1 Nc7 21. Nbc5 Bxc5 22. Nxc5 Qb5 23. e6 Qxc5 24. Bxc7 Qe7 25. Qf4 Rf6 26. Bd6 Qe8 27. e7 Ra7 28. Bc5 Rd7 29. Qb8 Rb7 30. Qxc8 Rb8 31. Qxb8 1-0

[Event "Sofia MGU op 190th"]
[Site "Sofia"]
[Date "2017.09.24"]
[Round "4"]
[White "Georgiev, Nikolay"]
[Black "Kostov, Nikolai"]
[Result "1/2-1/2"]
[ECO "B01"]
[WhiteElo "1572"]
[BlackElo "1648"]
[PlyCount "153"]
[EventDate "2017.09.23"]
[EventType "swiss"]
[EventRounds "6"]
[EventCountry "BUL"]
[SourceTitle "CBM 180 Extra"]
[Source "ChessBase"]
[SourceDate "2017.10.06"]
[SourceVersion "1"]
[SourceVersionDate "2017.10.06"]
[SourceQuality "1"]

1. e4 d5 2. exd5 Nf6 3. Bb5+ Bd7 4. Bc4 c6 5. Nc3 Bg4 6. f3 cxd5 7. Nxd5 Nxd5 8. fxg4 e6 9. Nf3 Nc6 10. d4 Qc7 11. Bxd5 Qa5+ 12. c3 Qxd5 13. 0-0 h5 14. g5 Bd6 15. Qb3 Qxb3 16. axb3 0-0 17. Be3 a6 18. Nd2 b5 19. Ne4 Bc7 20. b4 a5 21. bxa5 Nxa5 22. Nd2 Nc4 23. Rxa8 Rxa8 24. Nxc4 bxc4 25. g3 Bd6 26. Bf4 Be7 27. h4 Ra7 28. Be5 Rb7 29. Rf2 Rb5 30. Kf1 Ra5 31. Ke2 Ra2 32. Kd1 Ra5 33. Kc2 Rb5 34. Rf1 Ra5 35. Rb1 Ra2 36. Kc1 f6 37. gxf6 gxf6 38. Bf4 Kf7 39. b4 Kg6 40. b5 Ba3+ 41. Kd1 Rg2 42. b6 Rg1+ 43. Kc2 Rg2+ 44. Bd2 Bd6 45. b7 Bb8 46. Rb4 Rxg3 47. Kd1 Rg1+ 48. Be1 Kf5 49. Ke2 Ke4 50. Rxc4 Rg7 51. Rb4 f5 52. Rb6 Rg2+ 53. Kf1 Rg7 54. Rxe6+ Kf3 55. Rb6 Ke4 56. Bf2 f4 57. Ke2 f3+ 58. Kd2 Rg2 59. Ke1 Kd3 60. Rh6 Rh2 61. Kf1 Rh1+ 62. Bg1 Bh2 63. Rh8 Rxg1+ 64. Kf2 Rb1 65. Rxh5 Kxc3 66. d5 Rxb7 67. Kxf3 Rd7 68. Ke4 Re7+ 69. Kf5 Kc4 70. Kf6 Re4 71. Kg6 Rd4 72. Kf7 Rxd5 73. Rxd5 Kxd5 74. h5 Bf4 75. Kg6 Bd2 76. h6 Bxh6 77. Kxh6 1/2-1/2

[Event "Sofia MGU op 190th"]
[Site "Sofia"]
[Date "2017.09.24"]
[Round "5"]
[White "Kostov, Nikolai"]
[Black "Dimov, Nikola"]
[Result "1-0"]
[ECO "A45"]
[WhiteElo "1648"]
[BlackElo "1551"]
[PlyCount "121"]
[EventDate "2017.09.23"]
[EventType "swiss"]
[EventRounds "6"]
[EventCountry "BUL"]
[SourceTitle "CBM 180 Extra"]
[Source "ChessBase"]
[SourceDate "2017.10.06"]
[SourceVersion "1"]
[SourceVersionDate "2017.10.06"]
[SourceQuality "1"]

1. d4 Nf6 2. e3 g6 3. g3 Bg7 4. Bg2 0-0 5. Nf3 c5 6. 0-0 cxd4 7. exd4 d6 8. h3 Qc7 9. Nc3 a6 10. Re1 Re8 11. Bg5 Nbd7 12. Qd2 Rb8 13. Re2 b5 14. a3 Bb7 15. Ne1 Nb6 16. b3 Nbd5 17. Nxd5 Nxd5 18. Bxd5 Bxd5 19. Qe3 f6 20. Bh6 Bh8 21. h4 Qd7 22. Kh2 e5 23. dxe5 dxe5 24. Rd1 Qc6 25. Nd3 Bf3 26. Nb4 Qb7 27. Red2 Bxd1 28. Rxd1 Red8 29. Re1 Qb6 30. Qf3 f5 31. Nc6 e4 32. Ne7+ Kf7 33. Rxe4 Qf6 34. Re2 Rd7 35. Bg5 Qc3 36. Re3 Qxc2 37. Re2 Qd3 38. Re3 Qd1 39. Qf4 Qd6 40. Qf3 Be5 41. Nxf5 gxf5 42. Qxf5+ Kg8 43. Qg4 Rg7 44. Qe4 Bf6 45. Bf4 Qd8 46. Bxb8 Qxb8 47. Qc6 Be7 48. Qxa6 Bc5 49. Qe6+ Kh8 50. Rc3 Qf8 51. f4 Bxa3 52. Rc8 Qxc8 53. Qxc8+ Rg8 54. Qc3+ Rg7 55. b4 Bxb4 56. Qxb4 Rf7 57. Qxb5 Kg8 58. g4 Kg7 59. Kg3 Ra7 60. Qb2+ Kg8 61. Qb8+ 1-0

[Event "Sofia MGU op 190th"]
[Site "Sofia"]
[Date "2017.09.24"]
[Round "6"]
[White "Krustev, Krasimir S"]
[Black "Kostov, Nikolai"]
[Result "1-0"]
[ECO "C56"]
[WhiteElo "1970"]
[BlackElo "1648"]
[PlyCount "27"]
[EventDate "2017.09.23"]
[EventType "swiss"]
[EventRounds "6"]
[EventCountry "BUL"]
[SourceTitle "CBM 180 Extra"]
[Source "ChessBase"]
[SourceDate "2017.10.06"]
[SourceVersion "1"]
[SourceVersionDate "2017.10.06"]
[SourceQuality "1"]

1. e4 e5 2. Nf3 Nc6 3. Bc4 Nf6 4. d4 Nxe4 5. dxe5 Be7 6. Qd5 0-0 7. Qxe4 d5 8. Bxd5 Bf5 9. Qxf5 Qxd5 10. 0-0 Rfe8 11. Nc3 Qa5 12. Bd2 Rad8 13. Ne4 Qb6 14. Bc3 1-0

[Event "Sofia MGU op 190th"]
[Site "Sofia"]
[Date "2017.09.23"]
[Round "2"]
[White "Kostov, Nikolai"]
[Black "Babatov, Martin"]
[Result "0-1"]
[ECO "B12"]
[WhiteElo "1648"]
[BlackElo "1737"]
[PlyCount "94"]
[EventDate "2017.09.23"]
[EventType "swiss"]
[EventRounds "6"]
[EventCountry "BUL"]
[SourceTitle "CBM 180 Extra"]
[Source "ChessBase"]
[SourceDate "2017.10.06"]
[SourceVersion "1"]
[SourceVersionDate "2017.10.06"]
[SourceQuality "1"]

1. d4 c6 2. e4 d5 3. e5 Bf5 4. Bd3 Bxd3 5. Qxd3 e6 6. Nh3 Ne7 7. 0-0 Nf5 8. g4 Nh4 9. Nd2 Be7 10. Nf3 Nxf3+ 11. Qxf3 Nd7 12. c3 h6 13. Bd2 Qb6 14. b4 a5 15. bxa5 Qxa5 16. Qe3 h5 17. g5 g6 18. c4 Qa3 19. cxd5 Qxe3 20. Bxe3 cxd5 21. a4 Bd8 22. Rfb1 Ra7 23. Kg2 Nb6 24. Rb4 Nc4 25. Kf3 Kd7 26. Ke2 Be7 27. Rb3 b6 28. f4 Rha8 29. Nf2 Rxa4 30. Rxa4 Rxa4 31. h4 Nxe3 32. Kxe3 Ra3 33. Rxa3 Bxa3 34. Nd3 Kc6 35. Kd2 Kb5 36. Kc3 Ka4 37. Kc2 b5 38. f5 exf5 39. Nf4 b4 40. Nxd5 b3+ 41. Kb1 Kb5 42. Nf4 Kc4 43. d5 Kd4 44. e6 Ke4 45. Nxh5 gxh5 46. exf7 Kxd5 47. g6 Bf8 0-1

[Event "Sofia MGU op 190th"]
[Site "Sofia"]
[Date "2017.09.23"]
[Round "1"]
[White "Kostov, Nikolai"]
[Black "Doychev, Ivan"]
[Result "1-0"]
[ECO "D00"]
[WhiteElo "1648"]
[BlackElo "1188"]
[PlyCount "37"]
[EventDate "2017.09.23"]
[EventType "swiss"]
[EventRounds "6"]
[EventCountry "BUL"]
[SourceTitle "CBM 180 Extra"]
[Source "ChessBase"]
[SourceDate "2017.10.06"]
[SourceVersion "1"]
[SourceVersionDate "2017.10.06"]
[SourceQuality "1"]

1. d4 Nf6 2. e3 d5 3. Bd3 c5 4. c3 Nc6 5. f4 Bg4 6. Nf3 e6 7. 0-0 cxd4 8. cxd4 Be7 9. a3 0-0 10. Qc2 Rc8 11. Bd2 Qb6 12. h3 Bxf3 13. Rxf3 Na5 14. b4 Nc4 15. Bxc4 Rxc4 16. Qd3 Rfc8 17. f5 a5 18. bxa5 Qb2 19. fxe6 1-0

