[Event "Marburg op-B"]
[Site "Marburg"]
[Date "2023.10.29"]
[Round "6"]
[White "Heller, Alexander"]
[Black "Koch, Mika Jonas"]
[Result "1/2-1/2"]
[ECO "A05"]
[PlyCount "48"]
[EventDate "2023.10.26"]
[EventType "swiss"]
[EventRounds "7"]
[EventCountry "GER"]
[SourceTitle "CB49_2023"]
[SourceDate "2023.12.06"]
[SourceVersion "1"]
[SourceVersionDate "2023.12.06"]
[SourceQuality "1"]

1. e4 c5 2. d3 d6 3. Nf3 Nc6 4. g3 g6 5. Bg2 Nf6 6. 0-0 Bg7 7. c3 0-0 8. Nbd2 e5 9. Re1 Re8 10. Nf1 h6 11. Ne3 Be6 12. Bd2 b5 13. b4 Qd7 14. a4 a6 15. a5 Bh3 16. Qc2 Bxg2 17. Kxg2 cxb4 18. cxb4 Rac8 19. Qb3 Red8 20. Rac1 Nd4 21. Nxd4 exd4 22. Nd5 Nxd5 23. Qxd5 Kh7 24. Bf4 Rc3 1/2-1/2

[Event "Marburg op-B"]
[Site "Marburg"]
[Date "2023.10.29"]
[Round "7"]
[White "Henzelmann, Matthias"]
[Black "Koch, Mika Jonas"]
[Result "1/2-1/2"]
[ECO "D58"]
[WhiteElo "1439"]
[PlyCount "100"]
[EventDate "2023.10.26"]
[EventType "swiss"]
[EventRounds "7"]
[EventCountry "GER"]
[SourceTitle "CB49_2023"]
[SourceDate "2023.12.06"]
[SourceVersion "1"]
[SourceVersionDate "2023.12.06"]
[SourceQuality "1"]

1. d4 Nf6 2. c4 e6 3. Nc3 d5 4. Bg5 Be7 5. Nf3 h6 6. Bh4 0-0 7. e3 b6 8. Qc2 Bb7 9. Be2 Nfd7 10. Bxe7 Qxe7 11. Qb3 dxc4 12. Bxc4 Nc6 13. a3 Na5 14. Qa2 Nxc4 15. Qxc4 Rac8 16. b4 Nf6 17. Ke2 Bd5 18. Nxd5 Nxd5 19. Rac1 a5 20. bxa5 Qxa3 21. axb6 cxb6 22. Qxc8 Rxc8 23. Rxc8+ Kh7 24. Rhc1 b5 25. Nd2 b4 26. Ke1 Qd3 27. Nb1 Qb3 28. Nd2 Qd3 29. Nb1 b3 30. Rb8 f5 31. Nd2 Nc3 32. Rxc3 Qxc3 33. Rxb3 Qc1+ 34. Ke2 Qg1 35. g3 Qxh2 36. Rb6 Qh5+ 37. Kd3 Qe8 38. Nc4 Qa4 39. Nd2 Qd7 40. Ke2 Qd5 41. Kf1 e5 42. Nb3 Qh1+ 43. Ke2 e4 44. Nd2 Qh5+ 45. Ke1 Qe8 46. Ke2 Qf8 47. Rb5 Qf7 48. Rc5 h5 49. f3 exf3+ 50. Nxf3 g6 1/2-1/2

[Event "Marburg op-B"]
[Site "Marburg"]
[Date "2023.10.28"]
[Round "5"]
[White "Koch, Mika Jonas"]
[Black "Rittel, Christoph"]
[Result "1/2-1/2"]
[ECO "A21"]
[PlyCount "107"]
[EventDate "2023.10.26"]
[EventType "swiss"]
[EventRounds "7"]
[EventCountry "GER"]
[SourceTitle "CB49_2023"]
[SourceDate "2023.12.06"]
[SourceVersion "1"]
[SourceVersionDate "2023.12.06"]
[SourceQuality "1"]

1. c4 e5 2. Nc3 f5 3. d3 Nf6 4. Nf3 d6 5. g3 c6 6. Bg2 Be7 7. Qc2 0-0 8. 0-0 Na6 9. a3 Qe8 10. Re1 Qg6 11. Bd2 f4 12. Rac1 fxg3 13. fxg3 Nh5 14. d4 Qg4 15. Qe4 Qxe4 16. Nxe4 Nf6 17. Nxf6+ gxf6 18. e4 Be6 19. d5 cxd5 20. cxd5 Bd7 21. Be3 Nc5 22. Bxc5 dxc5 23. Red1 Bd6 24. Nd2 Bg4 25. Rf1 b5 26. Bf3 Bd7 27. Be2 a6 28. b3 Rac8 29. Kf2 f5 30. Kg2 Be7 31. exf5 Bxf5 32. Rxf5 Rxf5 33. Bg4 Rff8 34. Bxc8 Rxc8 35. Ne4 c4 36. d6 Bd8 37. b4 Bb6 38. Nc5 Bxc5 39. bxc5 Rxc5 40. Rd1 Rc8 41. Kf3 Kf7 42. Ke4 Ke6 43. Rd5 c3 44. Rxe5+ Kxd6 45. Rd5+ Ke6 46. Rd1 c2 47. Rc1 a5 48. Kd3 b4 49. axb4 axb4 50. Rxc2 Rd8+ 51. Ke4 b3 52. Rb2 Rb8 53. Kd4 Kf5 54. h3 1/2-1/2

[Event "Marburg op-B"]
[Site "Marburg"]
[Date "2023.10.28"]
[Round "4"]
[White "Liu, Jonas1"]
[Black "Koch, Mika Jonas"]
[Result "1-0"]
[ECO "B22"]
[WhiteElo "1539"]
[PlyCount "63"]
[EventDate "2023.10.26"]
[EventType "swiss"]
[EventRounds "7"]
[EventCountry "GER"]
[SourceTitle "CB49_2023"]
[SourceDate "2023.12.06"]
[SourceVersion "1"]
[SourceVersionDate "2023.12.06"]
[SourceQuality "1"]

1. e4 c5 2. c3 d5 3. exd5 Qxd5 4. d4 Nc6 5. Nf3 Bg4 6. Be3 e5 7. c4 Qd7 8. d5 Nd4 9. Bxd4 cxd4 10. Nxe5 Bb4+ 11. Nd2 Bxd1 12. Nxd7 Ba4 13. Ne5 Nf6 14. Nd3 Bxd2+ 15. Kxd2 0-0 16. f3 Rac8 17. b3 Bd7 18. Ne5 Bf5 19. g4 Bg6 20. g5 Rfe8 21. Nxg6 fxg6 22. gxf6 gxf6 23. Bh3 f5 24. Rae1 Kf7 25. Kd3 Rc7 26. d6 Rd7 27. c5 b6 28. b4 bxc5 29. bxc5 Rb8 30. Rb1 Rdb7 31. Rxb7+ Rxb7 32. Re1 1-0

[Event "Marburg op-B"]
[Site "Marburg"]
[Date "2023.10.27"]
[Round "3"]
[White "Koch, Mika Jonas"]
[Black "Pishnograev, Ilya"]
[Result "1-0"]
[ECO "A22"]
[PlyCount "33"]
[EventDate "2023.10.26"]
[EventType "swiss"]
[EventRounds "7"]
[EventCountry "GER"]
[SourceTitle "CB49_2023"]
[SourceDate "2023.12.06"]
[SourceVersion "1"]
[SourceVersionDate "2023.12.06"]
[SourceQuality "1"]

1. c4 e5 2. Nc3 Nf6 3. d3 d5 4. cxd5 Nxd5 5. Bd2 Nc6 6. Nf3 f6 7. g3 Be6 8. Bg2 Qd7 9. 0-0 Bc5 10. a3 a6 11. Qc2 b5 12. Nxd5 Qxd5 13. Ng5 Qd6 14. Nxe6 Qxe6 15. Qxc5 Nd4 16. Bxa8 Nxe2+ 17. Kh1 1-0

[Event "Marburg op-B"]
[Site "Marburg"]
[Date "2023.10.27"]
[Round "2"]
[White "Stepanjan, Tatevik Mia"]
[Black "Koch, Mika Jonas"]
[Result "0-1"]
[ECO "B72"]
[WhiteElo "1351"]
[PlyCount "100"]
[EventDate "2023.10.26"]
[EventType "swiss"]
[EventRounds "7"]
[EventCountry "GER"]
[SourceTitle "CB49_2023"]
[SourceDate "2023.12.06"]
[SourceVersion "1"]
[SourceVersionDate "2023.12.06"]
[SourceQuality "1"]

1. e4 c5 2. Nf3 d6 3. d4 cxd4 4. Nxd4 Nc6 5. Be3 Nf6 6. Nc3 g6 7. Bc4 Bg7 8. 0-0 0-0 9. Rb1 Ng4 10. Nxc6 bxc6 11. Bd4 Ne5 12. Bb3 c5 13. Bxe5 Bxe5 14. Bd5 Rb8 15. Qd3 Bd7 16. Rfe1 Qc7 17. a3 Rfc8 18. Qf3 Be8 19. b3 Qa5 20. Ne2 Qxa3 21. Nf4 c4 22. Bxc4 Rxc4 23. bxc4 Rxb1 24. Rxb1 Qxf3 25. gxf3 Bxf4 26. Rb8 Kf8 27. Rb7 Ba4 28. c3 a5 29. Ra7 Bb3 30. c5 dxc5 31. Rxa5 c4 32. Rd5 e6 33. Ra5 Bd2 34. Kf1 Bxc3 35. Ra3 Kg7 36. Ke2 Bb4 37. Ra1 c3 38. Kd3 c2 39. Rc1 Ba3 40. Rxc2 Bxc2+ 41. Kxc2 Bd6 42. h3 Kf6 43. Kd3 Kg5 44. Kd4 Kf4 45. h4 h5 46. Kc4 Kxf3 47. Kd3 Bc5 48. e5 Bxf2 49. Kd2 Bxh4 50. Kd1 g5 0-1

[Event "Marburg op-B"]
[Site "Marburg"]
[Date "2023.10.26"]
[Round "1"]
[White "Koch, Mika Jonas"]
[Black "Scheerer, Amelie"]
[Result "0-1"]
[ECO "C51"]
[BlackElo "1468"]
[PlyCount "70"]
[EventDate "2023.10.26"]
[EventType "swiss"]
[EventRounds "7"]
[EventCountry "GER"]
[SourceTitle "CB49_2023"]
[SourceDate "2023.12.06"]
[SourceVersion "1"]
[SourceVersionDate "2023.12.06"]
[SourceQuality "1"]

1. e4 e5 2. Nf3 Nc6 3. Bc4 Bc5 4. b4 Bxb4 5. c3 Be7 6. 0-0 Nf6 7. Re1 0-0 8. d4 d6 9. h3 exd4 10. cxd4 d5 11. exd5 Nxd5 12. Bxd5 Qxd5 13. Nc3 Qc4 14. Bb2 Bb4 15. d5 Bxc3 16. Rc1 Nb4 17. Ne5 Qxd5 18. Rxc3 Qxd1 19. Rxd1 c6 20. Rg3 f6 21. Nf3 Nd5 22. Nd4 Re8 23. Rd2 Bd7 24. Nb5 Bf5 25. Nd6 Re1+ 26. Kh2 Bd7 27. Rxd5 cxd5 28. Bxf6 g6 29. Nb5 Bf5 30. Nc7 Rf8 31. Bc3 Rd1 32. Nb5 Rd3 33. Rxd3 Bxd3 34. Nd4 Rxf2 35. a3 Be4 0-1

