[Event "North American op 30th"]
[Site "Stillwater"]
[Date "2011.05.30"]
[Round "10"]
[White "Atalik, Suat"]
[Black "Claassen, Chris"]
[Result "1-0"]
[ECO "D47"]
[WhiteElo "2616"]
[BlackElo "2049"]
[PlyCount "69"]
[EventDate "2011.05.27"]
[EventType "swiss"]
[EventRounds "11"]
[EventCountry "USA"]
[SourceTitle "CBM 142 Extra"]
[Source "ChessBase"]
[SourceDate "2011.06.27"]
[SourceVersion "1"]
[SourceVersionDate "2011.06.27"]
[SourceQuality "1"]

1. d4 d5 2. Nf3 Nf6 3. c4 c6 4. Nc3 e6 5. e3 Nbd7 6. Bd3 dxc4 7. Bxc4 Be7 8. e4 0-0 9. 0-0 Re8 10. Qe2 Nf8 11. Rd1 Qc7 12. Bg5 Ng6 13. e5 Nd5 14. Rac1 Nxc3 15. bxc3 b6 16. h4 h6 17. Bxe7 Nxe7 18. Bd3 Bb7 19. Qe4 Nf5 20. c4 g6 21. Qf4 Kg7 22. d5 cxd5 23. cxd5 Qe7 24. d6 Qd8 25. Bxf5 gxf5 26. Rc7 Bxf3 27. gxf3 Rg8 28. Kh2 Qf8 29. Rg1+ Kh7 30. Rg3 Rc8 31. Qc4 Re8 32. d7 Rd8 33. Rxg8 Qxg8 34. Rc8 Qf8 35. Qc7 1-0

[Event "North American op 30th"]
[Site "Stillwater"]
[Date "2011.05.30"]
[Round "11"]
[White "Wawrzaszek, Jason"]
[Black "Claassen, Chris"]
[Result "0-1"]
[ECO "B98"]
[WhiteElo "1987"]
[BlackElo "2049"]
[PlyCount "44"]
[EventDate "2011.05.27"]
[EventType "swiss"]
[EventRounds "11"]
[EventCountry "USA"]
[SourceTitle "CBM 142 Extra"]
[Source "ChessBase"]
[SourceDate "2011.06.27"]
[SourceVersion "1"]
[SourceVersionDate "2011.06.27"]
[SourceQuality "1"]

1. e4 c5 2. Nf3 d6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 a6 6. Bg5 e6 7. f4 Be7 8. Qf3 Nbd7 9. Bc4 0-0 10. 0-0-0 Qc7 11. Bxe6 fxe6 12. Nxe6 Qb6 13. Nxf8 Nxf8 14. Bxf6 Bxf6 15. f5 Nd7 16. Qd3 Be5 17. Qc4+ Kf8 18. Kb1 Nf6 19. Qb3 Qxb3 20. axb3 Bxc3 21. bxc3 Nxe4 22. Rhe1 Nxc3+ 0-1

[Event "North American op 30th"]
[Site "Stillwater"]
[Date "2011.05.29"]
[Round "7"]
[White "Anderson, Mark C"]
[Black "Claassen, Chris"]
[Result "0-1"]
[ECO "D63"]
[WhiteElo "1830"]
[BlackElo "2049"]
[PlyCount "102"]
[EventDate "2011.05.27"]
[EventType "swiss"]
[EventRounds "11"]
[EventCountry "USA"]
[SourceTitle "CBM 142 Extra"]
[Source "ChessBase"]
[SourceDate "2011.06.27"]
[SourceVersion "1"]
[SourceVersionDate "2011.06.27"]
[SourceQuality "1"]

1. Nf3 Nf6 2. d4 e6 3. Bg5 d5 4. e3 c6 5. Bd3 Nbd7 6. 0-0 Be7 7. c4 0-0 8. Nc3 Re8 9. Rc1 dxc4 10. Bxc4 Nd5 11. Bxe7 Qxe7 12. a3 N5b6 13. Ba2 e5 14. Nxe5 Nxe5 15. dxe5 Qxe5 16. Qf3 Be6 17. Bb1 Nc4 18. Qe2 Rad8 19. Rfd1 Rxd1+ 20. Rxd1 Nxa3 21. Bd3 Bb3 22. Ra1 Nb5 23. Nxb5 cxb5 24. Rxa7 Rc8 25. Ra1 g6 26. f4 Qd5 27. f5 Rd8 28. f6 h5 29. Bxb5 Bd1 30. Qf1 Qd2 31. Kh1 Kh7 32. Bc4 Rd7 33. h3 Qc2 34. b3 Rd2 35. Bxf7 Be2 36. Qf4 Bd3 37. Rg1 Be4 38. Bxg6+ Bxg6 39. f7 Bxf7 40. Qxf7+ Kh6 41. Qf4+ Kh7 42. b4 Rf2 43. Qg3 Rf6 44. Qg5 Qc6 45. Qxh5+ Rh6 46. Qf7+ Kh8 47. Qf8+ Kh7 48. Qf5+ Rg6 49. Kh2 Qd6+ 50. Qf4 Qd3 51. Qf5 Qxf5 0-1

[Event "North American op 30th"]
[Site "Stillwater"]
[Date "2011.05.29"]
[Round "9"]
[White "Claassen, Chris"]
[Black "Galant, Sergey"]
[Result "1-0"]
[ECO "D51"]
[WhiteElo "2049"]
[BlackElo "2158"]
[PlyCount "87"]
[EventDate "2011.05.27"]
[EventType "swiss"]
[EventRounds "11"]
[EventCountry "USA"]
[SourceTitle "CBM 142 Extra"]
[Source "ChessBase"]
[SourceDate "2011.06.27"]
[SourceVersion "1"]
[SourceVersionDate "2011.06.27"]
[SourceQuality "1"]

1. d4 d5 2. c4 c6 3. Nf3 Nf6 4. Nc3 e6 5. Bg5 Nbd7 6. Qc2 Bb4 7. Nd2 Qa5 8. Bxf6 Nxf6 9. f3 0-0 10. e3 c5 11. Nb3 Bxc3+ 12. Qxc3 Qxc3+ 13. bxc3 cxd4 14. cxd4 dxc4 15. Bxc4 Nd5 16. Kd2 Nb6 17. Rac1 Rd8 18. e4 Bd7 19. Ke3 Rac8 20. Bd3 Na4 21. Na5 b6 22. Nb7 Rxc1 23. Rxc1 Rc8 24. Rxc8+ Bxc8 25. Nd6 Bd7 26. Kd2 Kf8 27. Kc2 e5 28. dxe5 Be6 29. Bc4 Bxc4 30. Nxc4 Ke7 31. Nd6 Ke6 32. f4 Nc5 33. Kc3 f6 34. Kd4 fxe5+ 35. fxe5 Kd7 36. Kd5 Ne6 37. g3 g5 38. Nb5 a6 39. Nd4 Nxd4 40. Kxd4 Ke6 41. g4 b5 42. Kc5 Kxe5 43. Kb6 Kxe4 44. Kxa6 1-0

[Event "North American op 30th"]
[Site "Stillwater"]
[Date "2011.05.29"]
[Round "8"]
[White "Claassen, Chris"]
[Black "Yermolinsky, Alex"]
[Result "1/2-1/2"]
[ECO "D86"]
[WhiteElo "2049"]
[BlackElo "2530"]
[PlyCount "110"]
[EventDate "2011.05.27"]
[EventType "swiss"]
[EventRounds "11"]
[EventCountry "USA"]
[SourceTitle "CBM 142 Extra"]
[Source "ChessBase"]
[SourceDate "2011.06.27"]
[SourceVersion "1"]
[SourceVersionDate "2011.06.27"]
[SourceQuality "1"]

1. d4 Nf6 2. c4 g6 3. Nc3 d5 4. cxd5 Nxd5 5. e4 Nxc3 6. bxc3 Bg7 7. Bc4 0-0 8. Ne2 Qd7 9. 0-0 b6 10. Be3 Bb7 11. Bd3 Nc6 12. f4 Rad8 13. Qd2 e6 14. Rad1 f5 15. Ng3 Na5 16. Qe2 Bf6 17. Bf2 Bh4 18. Rfe1 Rde8 19. Kh1 Bxg3 20. Bxg3 fxe4 21. Bxe4 Bxe4 22. Qxe4 Qd5 23. Qe2 Rf5 24. Qc2 Nc4 25. Qa4 Ref8 26. Qc2 g5 27. Qe2 gxf4 28. Bh4 Ne3 29. c4 Nxc4 30. Qxe6+ Qxe6 31. Rxe6 Rd5 32. Bf2 Rd6 33. Re7 Rf7 34. Re8+ Kg7 35. d5 c5 36. h3 a5 37. Re6 Rfd7 38. Rde1 Rxd5 39. R1e4 b5 40. Rxf4 Rf7 41. Rg4+ Kf8 42. Bg3 a4 43. Ra6 h5 44. Ra8+ Ke7 45. Re4+ Kf6 46. Ra6+ Kg7 47. Ree6 a3 48. Rg6+ Kh7 49. Bh4 Ne5 50. Rh6+ Kg7 51. Rhb6 b4 52. Bf6+ Rxf6 53. Rxf6 Rd1+ 54. Kh2 b3 55. axb3 a2 1/2-1/2

[Event "North American op 30th"]
[Site "Stillwater"]
[Date "2011.05.28"]
[Round "5"]
[White "Claassen, Chris"]
[Black "Patton, Thomas A"]
[Result "0-1"]
[ECO "D87"]
[WhiteElo "2049"]
[BlackElo "2074"]
[PlyCount "107"]
[EventDate "2011.05.27"]
[EventType "swiss"]
[EventRounds "11"]
[EventCountry "USA"]
[SourceTitle "CBM 142 Extra"]
[Source "ChessBase"]
[SourceDate "2011.06.27"]
[SourceVersion "1"]
[SourceVersionDate "2011.06.27"]
[SourceQuality "1"]

1. d4 Nf6 2. c4 g6 3. Nc3 d5 4. cxd5 Nxd5 5. e4 Nxc3 6. bxc3 c5 7. Bc4 Bg7 8. Ne2 Nc6 9. Be3 0-0 10. 0-0 Qc7 11. Rc1 Rd8 12. Qe1 Na5 13. Bd3 b6 14. f4 f5 15. exf5 gxf5 16. Ng3 e6 17. Nh5 Bb7 18. Qg3 Kh8 19. Be2 c4 20. d5 Rxd5 21. Nxg7 Qxg7 22. Bd4 Rxd4 23. Qxg7+ Kxg7 24. cxd4 Rc8 25. Bf3 Bd5 26. Bxd5 exd5 27. Rfe1 Nc6 28. Kf2 b5 29. Re6 Nxd4 30. Re5 Rc5 31. Re7+ Kg6 32. Rxa7 b4 33. Rb7 Ra5 34. Rxb4 Rxa2+ 35. Kf1 Nc2 36. Rb6+ Kg7 37. Rcb1 Ne3+ 38. Kg1 Rxg2+ 39. Kh1 Rg6 40. Rb7+ Kh6 41. Re7 Ng4 42. h3 Nf2+ 43. Kh2 Nd3 44. Rbb7 Nxf4 45. Rxh7+ Kg5 46. h4+ Kg4 47. Rbd7 c3 48. h5 Nxh5 49. Rxd5 Nf6 50. Rd4+ Ne4 51. Rc7 Kf3 52. Rd3+ Kf2 53. Rh3 Rg2+ 54. Kh1 0-1

[Event "North American op 30th"]
[Site "Stillwater"]
[Date "2011.05.28"]
[Round "4"]
[White "Johnson, Chuck"]
[Black "Claassen, Chris"]
[Result "0-1"]
[ECO "D08"]
[WhiteElo "1856"]
[BlackElo "2049"]
[PlyCount "82"]
[EventDate "2011.05.27"]
[EventType "swiss"]
[EventRounds "11"]
[EventCountry "USA"]
[SourceTitle "CBM 142 Extra"]
[Source "ChessBase"]
[SourceDate "2011.06.27"]
[SourceVersion "1"]
[SourceVersionDate "2011.06.27"]
[SourceQuality "1"]

1. d4 d5 2. c4 e5 3. dxe5 d4 4. Nf3 Nc6 5. e3 Bb4+ 6. Nbd2 Bg4 7. a3 dxe3 8. axb4 exd2+ 9. Bxd2 Qe7 10. Qa4 Bxf3 11. gxf3 Qxe5+ 12. Be3 Nge7 13. b5 Nd4 14. 0-0-0 Nef5 15. f4 Qf6 16. Bg2 0-0 17. Rhe1 c6 18. Qb4 Nxe3 19. Rxe3 Nf5 20. Red3 Nh4 21. Bh1 Qxf4+ 22. Kb1 Qf5 23. Ka1 a5 24. Qc3 Ng6 25. bxc6 bxc6 26. Bxc6 Rab8 27. Bd5 Qh5 28. Qd4 Rb4 29. h3 Qe5 30. Ra3 Qc7 31. Rg3 Rfb8 32. Rd2 Qe7 33. Re3 Qg5 34. Qg4 Qxg4 35. hxg4 Kf8 36. Ra3 Ne7 37. Rxa5 Nxd5 38. cxd5 Rxg4 39. Ra7 h5 40. d6 Rg6 41. Ra5 Rd8 0-1

[Event "North American op 30th"]
[Site "Stillwater"]
[Date "2011.05.27"]
[Round "1"]
[White "Claassen, Chris"]
[Black "Maldonado, Ernest Sr"]
[Result "1-0"]
[ECO "D53"]
[WhiteElo "2049"]
[BlackElo "1838"]
[PlyCount "77"]
[EventDate "2011.05.27"]
[EventType "swiss"]
[EventRounds "11"]
[EventCountry "USA"]
[SourceTitle "CBM 142 Extra"]
[Source "ChessBase"]
[SourceDate "2011.06.27"]
[SourceVersion "1"]
[SourceVersionDate "2011.06.27"]
[SourceQuality "1"]

1. d4 d5 2. c4 c6 3. Nf3 Nf6 4. Nc3 e6 5. Bg5 Nbd7 6. e3 Be7 7. Rc1 Ne4 8. Nxe4 dxe4 9. Bxe7 Qxe7 10. Nd2 f5 11. Be2 Nf6 12. 0-0 0-0 13. Qb3 Rb8 14. c5 Bd7 15. Nc4 Be8 16. Nd6 Kh8 17. Bc4 Nd5 18. Bxd5 exd5 19. f4 Bh5 20. Qc2 g5 21. Kh1 g4 22. b4 Rf6 23. g3 Rxd6 24. cxd6 Qxd6 25. Qc5 Qxc5 26. Rxc5 Kg7 27. Rb1 Be8 28. b5 Rc8 29. Rbc1 Kf6 30. Rxd5 cxd5 31. Rxc8 Bxb5 32. Rc7 h5 33. Rxb7 a6 34. a4 Bxa4 35. Rb6+ Kg7 36. Rxa6 Bb5 37. Rb6 Bc4 38. Kg1 Kh7 39. Rf6 1-0

[Event "North American op 30th"]
[Site "Stillwater"]
[Date "2011.05.27"]
[Round "3"]
[White "Claassen, Chris"]
[Black "Wright, Terry"]
[Result "1/2-1/2"]
[ECO "E76"]
[WhiteElo "2049"]
[BlackElo "1988"]
[PlyCount "127"]
[EventDate "2011.05.27"]
[EventType "swiss"]
[EventRounds "11"]
[EventCountry "USA"]
[SourceTitle "CBM 142 Extra"]
[Source "ChessBase"]
[SourceDate "2011.06.27"]
[SourceVersion "1"]
[SourceVersionDate "2011.06.27"]
[SourceQuality "1"]

1. d4 Nf6 2. c4 g6 3. Nc3 Bg7 4. e4 d6 5. f4 0-0 6. Nf3 Bg4 7. Be2 Nbd7 8. e5 dxe5 9. fxe5 Ne8 10. Ng5 Bxe2 11. Qxe2 e6 12. 0-0 h6 13. Nf3 f6 14. Be3 fxe5 15. dxe5 Rf5 16. Rad1 Qe7 17. Qd2 Nxe5 18. Nxe5 Bxe5 19. Rxf5 gxf5 20. Bxh6 Nd6 21. b3 Qf6 22. Ne2 Nf7 23. Bf4 Rd8 24. Qc2 Rxd1+ 25. Qxd1 Bxf4 26. Nxf4 Nd6 27. Ne2 Kf7 28. Nd4 Qg5 29. Nf3 Qe3+ 30. Kh1 Kf6 31. Qd4+ Qxd4 32. Nxd4 e5 33. Ne2 f4 34. Kg1 Kf5 35. Nc3 e4 36. Kf2 Nf7 37. g4+ Ke5 38. h4 Nh6 39. g5 Ng4+ 40. Ke1 Kf5 41. g6 Kxg6 42. Nxe4 Ne3 43. Kf2 Nf5 44. Kf3 Nxh4+ 45. Kxf4 Kf7 46. Ke5 Ke7 47. Kd5 Ng6 48. Nc5 b6 49. Ne4 Kd7 50. Nf6+ Kc8 51. Kc6 Ne7+ 52. Kb5 Kb7 53. Kb4 Nc6+ 54. Kc3 a5 55. a3 Ne7 56. Nd7 Nc8 57. Kd4 c6 58. c5 b5 59. Ke5 Kc7 60. Nf6 Ne7 61. Ke6 Ng6 62. Ne8+ Kb7 63. Nd6+ Kc7 64. Ne8+ 1/2-1/2

[Event "North American op 30th"]
[Site "Stillwater"]
[Date "2011.05.27"]
[Round "2"]
[White "Noor, Taimoor"]
[Black "Claassen, Chris"]
[Result "1/2-1/2"]
[ECO "B95"]
[WhiteElo "2002"]
[BlackElo "2049"]
[PlyCount "83"]
[EventDate "2011.05.27"]
[EventType "swiss"]
[EventRounds "11"]
[EventCountry "USA"]
[SourceTitle "CBM 142 Extra"]
[Source "ChessBase"]
[SourceDate "2011.06.27"]
[SourceVersion "1"]
[SourceVersionDate "2011.06.27"]
[SourceQuality "1"]

1. e4 c5 2. Nf3 d6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 a6 6. Bg5 e6 7. a4 Be7 8. Be3 0-0 9. g3 e5 10. Nb3 Be6 11. Bg2 Qd7 12. 0-0 Bh3 13. Re1 Bxg2 14. Kxg2 Qc7 15. a5 Nbd7 16. Qe2 Rac8 17. g4 Qc6 18. Qf3 Kh8 19. g5 Ng8 20. h4 f5 21. exf5 Rxf5 22. Qxc6 bxc6 23. Ne4 d5 24. Rad1 d4 25. Bc1 Rcf8 26. Re2 h6 27. Rd3 c5 28. Rg3 c4 29. Nbd2 Rc8 30. b3 cxb3 31. Nxb3 Nc5 32. Nbxc5 Bxc5 33. Rb3 Rf7 34. Ba3 Bxa3 35. Rxa3 Rc6 36. Rb3 Rfc7 37. c3 dxc3 38. Rc2 Rc4 39. Rcxc3 Rxc3 40. Rxc3 Rxc3 41. Nxc3 hxg5 42. hxg5 1/2-1/2

[Event "Stillwater Thanksgiving op 2nd"]
[Site "Stillwater"]
[Date "2010.11.21"]
[Round "4"]
[White "Claassen, Chris"]
[Black "Smith, James L"]
[Result "0-1"]
[ECO "D07"]
[WhiteElo "2054"]
[BlackElo "2013"]
[PlyCount "52"]
[EventDate "2010.11.20"]
[EventType "swiss"]
[EventRounds "5"]
[EventCountry "USA"]
[SourceTitle "CBM 139 Extra"]
[Source "ChessBase"]
[SourceDate "2011.01.05"]
[SourceVersion "1"]
[SourceVersionDate "2011.01.05"]
[SourceQuality "1"]

1. d4 d5 2. c4 Nc6 3. Nf3 Bg4 4. e3 e5 5. Be2 dxc4 6. 0-0 Qd7 7. Nc3 exd4 8. exd4 0-0-0 9. Qa4 Bxf3 10. Bxf3 Nxd4 11. Qxa7 Nxf3+ 12. gxf3 Qc6 13. Bg5 Nf6 14. Rad1 Bd6 15. Ne4 Rhg8 16. Kh1 b6 17. Qa6+ Kb8 18. Rd4 Bc5 19. Rxc4 Nxe4 20. Bxd8 Nd2 21. Bxc7+ Kxc7 22. Qa7+ Kd6 23. Qxf7 Nxf1 24. Qxg8 Qxf3+ 25. Kg1 Qxf2+ 26. Kh1 Qg1# 0-1

[Event "Stillwater Thanksgiving op 2nd"]
[Site "Stillwater"]
[Date "2010.11.21"]
[Round "5"]
[White "Montero, JA."]
[Black "Claassen, Chris"]
[Result "0-1"]
[ECO "D09"]
[WhiteElo "1775"]
[BlackElo "2054"]
[PlyCount "64"]
[EventDate "2010.11.20"]
[EventType "swiss"]
[EventRounds "5"]
[EventCountry "USA"]
[SourceTitle "CBM 139 Extra"]
[Source "ChessBase"]
[SourceDate "2011.01.05"]
[SourceVersion "1"]
[SourceVersionDate "2011.01.05"]
[SourceQuality "1"]

1. d4 d5 2. c4 e5 3. dxe5 d4 4. Nf3 Nc6 5. g3 Bg4 6. Bg2 Qd7 7. Bg5 h6 8. Bf4 g5 9. Bd2 Bh3 10. 0-0 Bxg2 11. Kxg2 0-0-0 12. Na3 g4 13. Ne1 Nxe5 14. Nd3 Nxd3 15. exd3 h5 16. Bf4 a6 17. Nc2 Be7 18. Re1 h4 19. gxh4 Rxh4 20. Bg3 Rh7 21. Re4 Nf6 22. Rf4 c5 23. Qe2 Nh5 24. Re4 Nxg3 25. fxg3 f5 26. Re5 Bd6 27. Rd5 Rdh8 28. Rh1 f4 29. gxf4 g3 30. h4 Rxh4 31. Rxh4 Rxh4 32. Rh5 Qh3+ 0-1

[Event "Stillwater Thanksgiving op 2nd"]
[Site "Stillwater"]
[Date "2010.11.20"]
[Round "1"]
[White "Chikkala, Srikarl"]
[Black "Claassen, Chris"]
[Result "1-0"]
[ECO "B22"]
[WhiteElo "1878"]
[BlackElo "2054"]
[PlyCount "65"]
[EventDate "2010.11.20"]
[EventType "swiss"]
[EventRounds "5"]
[EventCountry "USA"]
[SourceTitle "CBM 139 Extra"]
[Source "ChessBase"]
[SourceDate "2011.01.05"]
[SourceVersion "1"]
[SourceVersionDate "2011.01.05"]
[SourceQuality "1"]

1. e4 c5 2. c3 d6 3. d4 cxd4 4. cxd4 e6 5. Nf3 Nf6 6. Nc3 a6 7. Be3 Be7 8. Bd3 0-0 9. 0-0 Nc6 10. Rc1 Ng4 11. Bd2 e5 12. d5 Nb8 13. h3 Nf6 14. Be3 Nbd7 15. Qb3 b6 16. Ne2 Nc5 17. Qc2 Bd7 18. Bxc5 bxc5 19. a3 Qb6 20. Ng3 Rfb8 21. Rb1 Bb5 22. Bxb5 axb5 23. Ra1 Bf8 24. Rfc1 g6 25. Qd2 Ra4 26. b3 Nxe4 27. Qc2 Nxg3 28. bxa4 Nh5 29. axb5 Re8 30. a4 Nf4 31. Qe4 Qb7 32. Ra3 f5 33. Qc4 1-0

[Event "Stillwater Thanksgiving op 2nd"]
[Site "Stillwater"]
[Date "2010.11.20"]
[Round "2"]
[White "Claassen, Chris"]
[Black "Orton, William R"]
[Result "1-0"]
[ECO "A57"]
[WhiteElo "2054"]
[BlackElo "2148"]
[PlyCount "139"]
[EventDate "2010.11.20"]
[EventType "swiss"]
[EventRounds "5"]
[EventCountry "USA"]
[SourceTitle "CBM 139 Extra"]
[Source "ChessBase"]
[SourceDate "2011.01.05"]
[SourceVersion "1"]
[SourceVersionDate "2011.01.05"]
[SourceQuality "1"]

1. d4 Nf6 2. c4 c5 3. d5 b5 4. cxb5 Qa5+ 5. Nc3 Bb7 6. Bd2 Qb6 7. e4 e6 8. Be3 exd5 9. exd5 d6 10. a4 Qa5 11. Bc4 Be7 12. Nge2 0-0 13. 0-0 Nbd7 14. Bd2 Qc7 15. a5 Ne5 16. b3 Nfd7 17. f4 Ng6 18. Ng3 Bf6 19. Ra2 Ne7 20. Nge4 Bd4+ 21. Kh1 Nf6 22. Nxf6+ Bxf6 23. Ne4 Bd4 24. Nc3 Qd7 25. a6 Bc8 26. Ne2 Bf6 27. Bc3 Bxc3 28. Nxc3 Nf5 29. Re1 Nd4 30. Qd2 Re8 31. Raa1 f5 32. Rxe8+ Qxe8 33. Re1 Qf7 34. Ne2 Nxe2 35. Qxe2 Bd7 36. Qe7 Qxe7 37. Rxe7 Bc8 38. Rc7 Kf8 39. Be2 h6 40. Bh5 g5 41. g3 gxf4 42. gxf4 Rb8 43. Be2 Ra8 44. Kg2 Ke8 45. Bh5+ Kd8 46. Rh7 Rb8 47. Be2 Bd7 48. Rxh6 Kc7 49. Rh7 Rd8 50. Kf3 Kb6 51. h4 Ka5 52. h5 Bxb5 53. Bxb5 Kxb5 54. Rf7 Kxa6 55. Rxf5 Kb5 56. Rf7 c4 57. bxc4+ Kxc4 58. Rxa7 Kxd5 59. h6 Ke6 60. Kg4 Kf6 61. Kh5 d5 62. h7 Rh8 63. Kh6 Re8 64. Rg7 Re1 65. Rg6+ Kf7 66. Rg7+ Kf6 67. Rg6+ Kf7 68. Rf6+ Ke7 69. Kg7 Rg1+ 70. Rg6 1-0

[Event "Stillwater Thanksgiving op 2nd"]
[Site "Stillwater"]
[Date "2010.11.20"]
[Round "3"]
[White "Claassen, Chris"]
[Black "Williams, Jeffrey"]
[Result "1-0"]
[ECO "D63"]
[WhiteElo "2054"]
[BlackElo "1743"]
[PlyCount "95"]
[EventDate "2010.11.20"]
[EventType "swiss"]
[EventRounds "5"]
[EventCountry "USA"]
[SourceTitle "CBM 139 Extra"]
[Source "ChessBase"]
[SourceDate "2011.01.05"]
[SourceVersion "1"]
[SourceVersionDate "2011.01.05"]
[SourceQuality "1"]

1. d4 e6 2. c4 d5 3. Nc3 Nf6 4. Bg5 Be7 5. Nf3 0-0 6. e3 h6 7. Bh4 Nbd7 8. Rc1 b6 9. cxd5 exd5 10. Bd3 c5 11. 0-0 c4 12. Bb1 Bb7 13. Qc2 Ne4 14. Bxe7 Qxe7 15. Nxe4 dxe4 16. Nd2 Nf6 17. Qxc4 Rac8 18. Qa4 Bd5 19. Rc3 Rc7 20. Rfc1 Rfc8 21. Qc2 Rxc3 22. bxc3 b5 23. Qb2 a6 24. Bc2 Qc7 25. Bb3 Qc6 26. Rc2 Nd7 27. Bxd5 Qxd5 28. Qb3 Qxb3 29. axb3 f5 30. c4 Nb6 31. Kf1 Nd5 32. Ke2 Nb4 33. Rc1 Na2 34. Ra1 Nb4 35. Ra5 bxc4 36. bxc4 g6 37. c5 Ra8 38. Nc4 Nc6 39. Ra4 a5 40. Nb6 Ra7 41. d5 Nb4 42. d6 Nc6 43. Ra2 Kf8 44. Rd2 Ke8 45. d7+ Kd8 46. Rd6 Rc7 47. Rxg6 Ne5 48. Rg8+ 1-0

[Event "USA-ch Qualifier"]
[Site "Tulsa"]
[Date "2008.03.29"]
[Round "4"]
[White "Claassen, Chris"]
[Black "Hughes, Devin L"]
[Result "1-0"]
[ECO "A43"]
[WhiteElo "2055"]
[PlyCount "43"]
[EventDate "2008.03.28"]
[EventType "swiss"]
[EventRounds "7"]
[EventCountry "USA"]
[SourceTitle "CBM 123 Extra"]
[Source "ChessBase"]
[SourceDate "2008.05.06"]
[SourceVersion "1"]
[SourceVersionDate "2008.05.06"]
[SourceQuality "1"]

1. d4 c5 2. d5 g6 3. c4 Bg7 4. Nc3 d6 5. e4 e6 6. Be2 exd5 7. cxd5 a6 8. f4 b5 9. a3 Ne7 10. Nf3 0-0 11. 0-0 Nd7 12. Be3 Nb6 13. Qd2 Re8 14. f5 gxf5 15. Bh6 fxe4 16. Bxg7 Kxg7 17. Ng5 Bf5 18. Ncxe4 h6 19. Qc3+ Kf8 20. Qf6 hxg5 21. Qh6+ Kg8 22. Nf6# 1-0

[Event "Stillwater Winter op"]
[Site "Stillwater"]
[Date "2007.02.18"]
[Round "5"]
[White "Ortiz, Nadya Karolina"]
[Black "Claassen, Chris"]
[Result "1-0"]
[ECO "B23"]
[WhiteElo "2291"]
[BlackElo "2065"]
[PlyCount "46"]
[EventDate "2007.02.17"]
[EventType "swiss"]
[EventRounds "7"]
[EventCountry "USA"]
[SourceTitle "CBM 116 Extra"]
[Source "ChessBase"]
[SourceDate "2007.03.07"]
[SourceVersion "1"]
[SourceVersionDate "2007.03.07"]
[SourceQuality "1"]

1. e4 c5 2. Nc3 d6 3. f4 e6 4. Nf3 Nc6 5. Bc4 Nf6 6. d3 Be7 7. 0-0 0-0 8. Qe1 Na5 9. Bb3 Nxb3 10. axb3 b6 11. h3 Bb7 12. Bd2 a6 13. g4 Nd7 14. f5 Ne5 15. Qg3 Nxf3+ 16. Rxf3 Bh4 17. Qh2 h6 18. Raf1 Bf6 19. h4 Be5 20. Qg2 exf5 21. gxf5 Qf6 22. Kh1 Kh8 23. Qg4 Bd4 1-0

[Event "Stillwater Winter op"]
[Site "Stillwater"]
[Date "2007.02.17"]
[Round "2"]
[White "Abrahamyan, Tatev"]
[Black "Claassen, Chris"]
[Result "1-0"]
[ECO "B90"]
[WhiteElo "2295"]
[BlackElo "2065"]
[PlyCount "99"]
[EventDate "2007.02.17"]
[EventType "swiss"]
[EventRounds "7"]
[EventCountry "USA"]
[SourceTitle "CBM 116 Extra"]
[Source "ChessBase"]
[SourceDate "2007.03.07"]
[SourceVersion "1"]
[SourceVersionDate "2007.03.07"]
[SourceQuality "1"]

1. e4 c5 2. Nf3 d6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 a6 6. Be3 Ng4 7. Bg5 h6 8. Bh4 g5 9. Bg3 Bg7 10. Be2 h5 11. h4 Nc6 12. Nb3 gxh4 13. Rxh4 Be6 14. Qd2 Nce5 15. Nd4 Bc4 16. Nf5 Bf6 17. f3 Qb6 18. 0-0-0 Rc8 19. Nd4 Nd3+ 20. cxd3 Bxd4 21. dxc4 Be3 22. fxg4 Bxd2+ 23. Rxd2 Qe3 24. Be1 e6 25. gxh5 Rc5 26. Kc2 b5 27. cxb5 Ke7 28. Rh3 Qxe4+ 29. Rhd3 axb5 30. Bg3 d5 31. Bf3 Qh7 32. Bh4+ f6 33. Kd1 b4 34. Ne4 Rhc8 35. Bxf6+ Kf8 36. Nxc5 Rxc5 37. g4 Qc7 38. Bd4 Rc1+ 39. Ke2 Qh2+ 40. Bf2 Qf4 41. Bxd5 Qxg4+ 42. Bf3 Qc4 43. b3 Qb5 44. h6 Qe5+ 45. Re3 Qb5+ 46. Rdd3 Rc2+ 47. Ke1 Qf5 48. Rd8+ Kf7 49. h7 Rc1+ 50. Bd1 1-0

[Event "Stillwater op 26th"]
[Site "Stillwater"]
[Date "2006.11.05"]
[Round "5"]
[White "Claassen, Chris"]
[Black "Lee, Marvin"]
[Result "1-0"]
[ECO "D35"]
[WhiteElo "2078"]
[PlyCount "89"]
[EventDate "2006.11.04"]
[EventType "swiss"]
[EventRounds "5"]
[EventCountry "USA"]
[SourceTitle "EXT 2007"]
[Source "ChessBase"]
[SourceDate "2006.11.23"]
[SourceVersion "1"]
[SourceVersionDate "2006.11.23"]
[SourceQuality "1"]

1. d4 d5 2. c4 c6 3. Nc3 Nf6 4. Bg5 e6 5. cxd5 exd5 6. Qc2 Be7 7. e3 Bg4 8. Bd3 Nbd7 9. f3 Bh5 10. Nge2 Bg6 11. 0-0 0-0 12. e4 h6 13. Bh4 Rc8 14. e5 Bxd3 15. Qxd3 Nh7 16. Bxe7 Qxe7 17. Ng3 Qe6 18. Nf5 c5 19. Nxd5 Kh8 20. Nf4 Qb6 21. Nd6 Rcd8 22. Qc4 Ng5 23. Nd3 cxd4 24. f4 Ne6 25. Rae1 Qc6 26. Qb3 Ndc5 27. Nxc5 Nxc5 28. Nxf7+ Kh7 29. Nxd8 Rxd8 30. Qf3 Qb6 31. e6 Qxb2 32. e7 Re8 33. Qh5 Qb5 34. Qf5+ Kg8 35. Qd5+ Kh8 36. Qxd4 b6 37. f5 Qd7 38. Qh4 Qa4 39. Rf4 Qxa2 40. f6 Qf7 41. Ref1 Ne6 42. fxg7+ Qxg7 43. Rf7 Qg5 44. Qxg5 hxg5 45. Rf8+ 1-0

[Event "Stillwater op 26th"]
[Site "Stillwater"]
[Date "2006.11.05"]
[Round "4"]
[White "Movsisyan, Movses"]
[Black "Claassen, Chris"]
[Result "1-0"]
[ECO "B52"]
[WhiteElo "2275"]
[BlackElo "2078"]
[PlyCount "63"]
[EventDate "2006.11.04"]
[EventType "swiss"]
[EventRounds "5"]
[EventCountry "USA"]
[SourceTitle "EXT 2007"]
[Source "ChessBase"]
[SourceDate "2006.11.23"]
[SourceVersion "1"]
[SourceVersionDate "2006.11.23"]
[SourceQuality "1"]

1. e4 c5 2. Nf3 d6 3. Bb5+ Bd7 4. Bxd7+ Qxd7 5. 0-0 Nc6 6. c3 Nf6 7. Re1 e6 8. d4 cxd4 9. cxd4 Be7 10. Nc3 0-0 11. Bg5 Ne8 12. d5 Ne5 13. Nxe5 dxe5 14. Bxe7 Qxe7 15. Qb3 Nd6 16. dxe6 fxe6 17. Rad1 Rad8 18. Qa3 Nc8 19. Qa5 Qf6 20. f3 b6 21. Qa6 Qg5 22. Qc4 Qe7 23. Nb5 Qc5+ 24. Qxc5 bxc5 25. b3 Kf7 26. Kf2 Ke7 27. Ke2 Rd7 28. Rc1 a6 29. Na3 Rfd8 30. Nc4 Kf6 31. Red1 Rd4 32. Nxe5 1-0

[Event "Stillwater op 26th"]
[Site "Stillwater"]
[Date "2006.11.04"]
[Round "3"]
[White "Claassen, Chris"]
[Black "Un, Sam N"]
[Result "1-0"]
[ECO "D36"]
[WhiteElo "2078"]
[PlyCount "83"]
[EventDate "2006.11.04"]
[EventType "swiss"]
[EventRounds "5"]
[EventCountry "USA"]
[SourceTitle "EXT 2007"]
[Source "ChessBase"]
[SourceDate "2006.11.23"]
[SourceVersion "1"]
[SourceVersionDate "2006.11.23"]
[SourceQuality "1"]

1. d4 d5 2. c4 c6 3. Nc3 Nf6 4. Bg5 e6 5. cxd5 exd5 6. Qc2 Be7 7. e3 h6 8. Bh4 0-0 9. Bd3 Nbd7 10. Nge2 c5 11. 0-0 a6 12. a4 Bd6 13. Nxd5 g5 14. Nxf6+ Qxf6 15. Bg3 cxd4 16. Bxd6 Qxd6 17. Nxd4 Ne5 18. Bf5 Bxf5 19. Qxf5 Ng6 20. Qh3 Ne7 21. Rad1 Qg6 22. Qd7 Qe4 23. Qh3 Qg6 24. e4 Rfd8 25. Qe3 Rd6 26. f4 Rad8 27. f5 Qh5 28. Rd2 Nc6 29. Nxc6 bxc6 30. Rxd6 Rxd6 31. Qc1 Qe2 32. Re1 Qd3 33. e5 Rd5 34. e6 fxe6 35. fxe6 Qd4+ 36. Kh1 Rd8 37. Qxc6 Qd2 38. Qe4 Kg7 39. e7 Re8 40. Qe5+ Kh7 41. Qf5+ Kg7 42. Rf1 1-0

[Event "Stillwater op 26th"]
[Site "Stillwater"]
[Date "2006.11.04"]
[Round "2"]
[White "Raczkowski, Tim"]
[Black "Claassen, Chris"]
[Result "0-1"]
[ECO "B66"]
[BlackElo "2078"]
[PlyCount "80"]
[EventDate "2006.11.04"]
[EventType "swiss"]
[EventRounds "5"]
[EventCountry "USA"]
[SourceTitle "EXT 2007"]
[Source "ChessBase"]
[SourceDate "2006.11.23"]
[SourceVersion "1"]
[SourceVersionDate "2006.11.23"]
[SourceQuality "1"]

1. e4 c5 2. Nf3 d6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 a6 6. Bg5 e6 7. f4 h6 8. Bxf6 Qxf6 9. Qd2 Nc6 10. 0-0-0 Nxd4 11. Qxd4 Qxf4+ 12. Kb1 Qe5 13. Qxe5 dxe5 14. Be2 Bd7 15. a3 Rc8 16. Rd2 Be7 17. Rhd1 Bc6 18. Bf3 0-0 19. Rd3 Rfd8 20. g3 Rxd3 21. Rxd3 Rd8 22. Be2 Rxd3 23. Bxd3 Bg5 24. Ne2 g6 25. c4 f5 26. exf5 exf5 27. c5 Be3 28. b4 Kg7 29. Kc2 Kf6 30. Kc3 g5 31. Bc2 f4 32. gxf4 exf4 33. Nd4 Bxd4+ 34. Kxd4 g4 35. Be4 g3 36. hxg3 fxg3 37. Bxc6 bxc6 38. Ke3 h5 39. a4 Ke6 40. a5 Kd5 0-1

[Event "Iowa Futurity 3rd"]
[Site "Ankeny"]
[Date "2006.10.01"]
[Round "6"]
[White "Claassen, Chris"]
[Black "Mc Entee, Tim R"]
[Result "1/2-1/2"]
[ECO "D86"]
[WhiteElo "2060"]
[BlackElo "2177"]
[PlyCount "114"]
[EventDate "2006.09.29"]
[EventType "tourn"]
[EventRounds "7"]
[EventCountry "USA"]
[SourceTitle "CBM 114 Extra"]
[Source "ChessBase"]
[SourceDate "2006.11.03"]
[SourceVersion "1"]
[SourceVersionDate "2006.11.03"]
[SourceQuality "1"]

1. d4 Nf6 2. c4 g6 3. Nc3 d5 4. cxd5 Nxd5 5. e4 Nxc3 6. bxc3 Bg7 7. Bc4 0-0 8. Ne2 Nc6 9. 0-0 Na5 10. Bd3 Be6 11. f4 Bc4 12. Bxc4 Nxc4 13. Qd3 b5 14. a4 a6 15. Rb1 c6 16. f5 Nb6 17. Qf3 Nxa4 18. e5 Qd5 19. Qf2 Rfe8 20. Bg5 Qa2 21. Ra1 Qc2 22. fxg6 Qxg6 23. Bd2 c5 24. Nf4 Qf5 25. Qh4 cxd4 26. cxd4 Qe4 27. Rae1 Qxd4+ 28. Be3 Qe4 29. Bc1 Qd4+ 30. Be3 Qc4 31. Qg3 Kh8 32. e6 Rg8 33. exf7 Qxf7 34. Qh3 Bf6 35. Nh5 Rg6 36. Nf4 Rg5 37. Ne6 Rh5 38. Qf3 Rg8 39. Kh1 Re5 40. Nf4 Qc4 41. Nh5 Re6 42. Nxf6 exf6 43. Bh6 Qc6 44. Rxe6 Qxe6 45. Qxf6+ Qxf6 46. Rxf6 Ra8 47. Rf7 b4 48. Rb7 a5 49. Be3 Rd8 50. g4 Nc3 51. h4 Kg8 52. h5 Rd3 53. Bf4 Nd5 54. Bd6 b3 55. Ba3 Nb4 56. Bxb4 b2 57. Be1 Rd1 1/2-1/2

[Event "Iowa Futurity 3rd"]
[Site "Ankeny"]
[Date "2006.10.01"]
[Round "7"]
[White "Deike, Ron R"]
[Black "Claassen, Chris"]
[Result "0-1"]
[ECO "A02"]
[BlackElo "2060"]
[PlyCount "56"]
[EventDate "2006.09.29"]
[EventType "tourn"]
[EventRounds "7"]
[EventCountry "USA"]
[SourceTitle "CBM 114 Extra"]
[Source "ChessBase"]
[SourceDate "2006.11.03"]
[SourceVersion "1"]
[SourceVersionDate "2006.11.03"]
[SourceQuality "1"]

1. f4 f5 2. e4 fxe4 3. d3 Nf6 4. dxe4 Nxe4 5. Bd3 Nf6 6. g4 d6 7. f5 h6 8. Nh3 e5 9. fxe6 Bxe6 10. Bg6+ Kd7 11. 0-0 c6 12. Qd3 Be7 13. Nf4 Qb6+ 14. Be3 Qa6 15. Nxe6 Qxd3 16. Nc5+ dxc5 17. Bxd3 Kc7 18. Bf5 Nd5 19. Bf2 Nd7 20. Bg3+ Kd8 21. Rd1 N7b6 22. Nc3 Bf6 23. Ne2 Ke7 24. Re1 Kf7 25. Rab1 Rhe8 26. Bf2 g6 27. c4 Nxc4 28. Bc2 Nd2 0-1

[Event "Iowa Futurity 3rd"]
[Site "Ankeny"]
[Date "2006.09.30"]
[Round "5"]
[White "Butros, Ryan T"]
[Black "Claassen, Chris"]
[Result "1/2-1/2"]
[ECO "B92"]
[WhiteElo "2176"]
[BlackElo "2060"]
[PlyCount "101"]
[EventDate "2006.09.29"]
[EventType "tourn"]
[EventRounds "7"]
[EventCountry "USA"]
[SourceTitle "CBM 114 Extra"]
[Source "ChessBase"]
[SourceDate "2006.11.03"]
[SourceVersion "1"]
[SourceVersionDate "2006.11.03"]
[SourceQuality "1"]

1. e4 c5 2. Nf3 d6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 a6 6. Be2 e5 7. Nb3 Be7 8. Be3 Be6 9. 0-0 0-0 10. f4 exf4 11. Bxf4 Nc6 12. Bf3 Rc8 13. Kh1 Ne8 14. Nd4 Nxd4 15. Qxd4 Bf6 16. Qb4 a5 17. Qa3 b5 18. Nxb5 Rxc2 19. Nc3 Qb8 20. Rab1 Qb4 21. Qxb4 axb4 22. Bd1 Rxb2 23. Rxb2 Bxc3 24. Rc2 d5 25. exd5 Bxd5 26. Bf3 Be6 27. Bd2 Nd6 28. Bxc3 bxc3 29. a4 Bb3 30. Rxc3 Bxa4 31. Bc6 Bxc6 32. Rxc6 Ne4 33. Rfc1 g6 34. Rc8 Rxc8 35. Rxc8+ Kg7 36. Kg1 h5 37. Kf1 f5 38. h4 g5 39. hxg5 Nxg5 40. Kf2 h4 41. Rc4 h3 42. gxh3 Nxh3+ 43. Kg3 Ng5 44. Kf4 Kf6 45. Ra4 Ne6+ 46. Kf3 Ng5+ 47. Kg3 Ne6 48. Ra6 Ke5 49. Kf3 Nd4+ 50. Ke3 f4+ 51. Kd3 1/2-1/2

[Event "Iowa Futurity 3rd"]
[Site "Ankeny"]
[Date "2006.09.30"]
[Round "3"]
[White "Claassen, Chris"]
[Black "Braunlich, Tom"]
[Result "0-1"]
[ECO "D31"]
[WhiteElo "2060"]
[BlackElo "2191"]
[PlyCount "118"]
[EventDate "2006.09.29"]
[EventType "tourn"]
[EventRounds "7"]
[EventCountry "USA"]
[SourceTitle "CBM 114 Extra"]
[Source "ChessBase"]
[SourceDate "2006.11.03"]
[SourceVersion "1"]
[SourceVersionDate "2006.11.03"]
[SourceQuality "1"]

1. d4 d5 2. c4 e6 3. Nc3 c6 4. e4 dxe4 5. Nxe4 Bb4+ 6. Bd2 Qxd4 7. Bxb4 Qxe4+ 8. Be2 c5 9. Bxc5 Qxg2 10. Qd6 Nd7 11. 0-0-0 Qc6 12. Qxc6 bxc6 13. Bd6 Ne7 14. Bf3 Bb7 15. Ne2 Nf5 16. Bf4 Nh4 17. Be4 f5 18. Bg5 Ng6 19. Bc2 Nge5 20. Rd6 Nf8 21. Rhd1 Nf7 22. Bf4 e5 23. Bxe5 Nxe5 24. Bxf5 Nxc4 25. R6d4 Nb6 26. Re1 g6 27. Ng3+ Kf7 28. Bg4 Nd5 29. Ne4 Rd8 30. Ng5+ Kf6 31. Ne4+ Kg7 32. Ng5 Bc8 33. Bxc8 Rxc8 34. Ra4 Rc7 35. Re8 h6 36. Rxf8 hxg5 37. Rxh8 Kxh8 38. Rg4 Kg7 39. Rxg5 Rf7 40. h4 Rxf2 41. a3 Nf4 42. b4 Nd3+ 43. Kd1 Rf5 44. Rg3 Ne5 45. Ke2 Kh6 46. a4 Kh5 47. b5 cxb5 48. axb5 Kxh4 49. Ra3 Rf7 50. Ra4+ Kg3 51. Re4 Re7 52. Kf1 g5 53. Re3+ Kf4 54. Ra3 g4 55. Kg2 Rb7 56. Ra4+ Kf5 57. Ra5 Nc4 58. Ra4 Nd6 59. b6 axb6 0-1

[Event "Iowa Futurity 3rd"]
[Site "Ankeny"]
[Date "2006.09.29"]
[Round "1"]
[White "Claassen, Chris"]
[Black "Schuller, John J"]
[Result "1-0"]
[ECO "E49"]
[WhiteElo "2060"]
[PlyCount "89"]
[EventDate "2006.09.29"]
[EventType "tourn"]
[EventRounds "7"]
[EventCountry "USA"]
[SourceTitle "CBM 114 Extra"]
[Source "ChessBase"]
[SourceDate "2006.11.03"]
[SourceVersion "1"]
[SourceVersionDate "2006.11.03"]
[SourceQuality "1"]

1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. f3 d5 5. a3 Bxc3+ 6. bxc3 c5 7. cxd5 exd5 8. e3 0-0 9. Bd3 Re8 10. Ne2 b6 11. 0-0 Bd7 12. Ng3 Nc6 13. Bc2 Rc8 14. Qd3 c4 15. Qd2 Ne7 16. e4 h6 17. e5 Nh7 18. f4 f5 19. Qe2 g6 20. h4 h5 21. Qf3 Be6 22. Nh1 Kh8 23. Nf2 Rg8 24. Nh3 Rg7 25. a4 Rc6 26. Ba3 a5 27. Rab1 Nc8 28. Qg3 Kg8 29. Nf2 Kh8 30. Nd1 Nf8 31. Ne3 Nh7 32. Bd1 Qd7 33. Qf2 Rg8 34. g3 Rd8 35. Qg2 Kg7 36. Rf2 Qf7 37. Rfb2 Rc7 38. Bf3 Nf8 39. Rb5 Rcd7 40. Qb2 Rc7 41. Bd6 Rxd6 42. exd6 Nxd6 43. Rxb6 Ne4 44. Bxe4 fxe4 45. Rb7 1-0

[Event "Iowa Futurity 3rd"]
[Site "Ankeny"]
[Date "2006.09.29"]
[Round "2"]
[White "Keating, Robert F"]
[Black "Claassen, Chris"]
[Result "1/2-1/2"]
[ECO "B99"]
[BlackElo "2060"]
[PlyCount "90"]
[EventDate "2006.09.29"]
[EventType "tourn"]
[EventRounds "7"]
[EventCountry "USA"]
[SourceTitle "CBM 114 Extra"]
[Source "ChessBase"]
[SourceDate "2006.11.03"]
[SourceVersion "1"]
[SourceVersionDate "2006.11.03"]
[SourceQuality "1"]

1. e4 c5 2. Nf3 d6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 a6 6. Bg5 e6 7. f4 h6 8. Bh4 Be7 9. Qf3 Qc7 10. 0-0-0 Nbd7 11. Qg3 g5 12. fxg5 Rg8 13. Qe1 hxg5 14. Bg3 Ne5 15. Kb1 Bd7 16. Be2 0-0-0 17. a3 Kb8 18. Rf1 Bc6 19. Bxe5 dxe5 20. Nxc6+ Qxc6 21. Rxd8+ Rxd8 22. Qg3 Qc7 23. Bd3 Nh5 24. Qe1 Nf4 25. g3 Nxd3 26. cxd3 f6 27. Qd2 Qd7 28. Rd1 f5 29. Kc2 Qc7 30. Kb1 f4 31. b4 Qb6 32. Ka2 a5 33. bxa5 Qxa5 34. Qb2 Bc5 35. Rb1 b6 36. Nb5 Bd6 37. gxf4 gxf4 38. h4 Bc7 39. h5 Rxd3 40. h6 Qd2 41. Rh1 Qxb2+ 42. Kxb2 Rd8 43. Rh3 Rh8 44. h7 f3 45. Rxf3 Rxh7 1/2-1/2

[Event "Oklahoma State-ch"]
[Site "Oklahoma"]
[Date "2006.07.16"]
[Round "4"]
[White "Claassen, Chris"]
[Black "Tubbs, Michael"]
[Result "1-0"]
[ECO "D36"]
[WhiteElo "2060"]
[PlyCount "47"]
[EventDate "2006.07.15"]
[EventType "swiss"]
[EventRounds "5"]
[EventCountry "USA"]
[SourceTitle "CBM 113 Extra"]
[Source "ChessBase"]
[SourceDate "2006.09.14"]
[SourceVersion "1"]
[SourceVersionDate "2006.09.14"]
[SourceQuality "1"]

1. d4 d5 2. c4 e6 3. Nc3 Be7 4. Qc2 Nf6 5. cxd5 exd5 6. Bg5 c6 7. e3 Nbd7 8. Bd3 0-0 9. Nge2 Re8 10. 0-0 Nf8 11. f3 Nh5 12. Bxe7 Qxe7 13. e4 Nf6 14. e5 N6d7 15. f4 f6 16. Ng3 Nb6 17. Rae1 Bd7 18. Qf2 g6 19. f5 g5 20. Nh5 fxe5 21. dxe5 Kh8 22. e6 Nxe6 23. fxe6 Bxe6 24. Qd4+ 1-0

[Event "Oklahoma State-ch"]
[Site "Oklahoma"]
[Date "2006.07.16"]
[Round "5"]
[White "Patton, Thomas A"]
[Black "Claassen, Chris"]
[Result "0-1"]
[ECO "D09"]
[WhiteElo "2097"]
[BlackElo "2060"]
[PlyCount "106"]
[EventDate "2006.07.15"]
[EventType "swiss"]
[EventRounds "5"]
[EventCountry "USA"]
[SourceTitle "CBM 113 Extra"]
[Source "ChessBase"]
[SourceDate "2006.09.14"]
[SourceVersion "1"]
[SourceVersionDate "2006.09.14"]
[SourceQuality "1"]

1. d4 d5 2. c4 e5 3. dxe5 d4 4. Nf3 Nc6 5. g3 Bg4 6. Bg2 Qd7 7. 0-0 0-0-0 8. a3 Bh3 9. b4 Bxg2 10. Kxg2 h5 11. h3 f6 12. exf6 Nxf6 13. Bg5 Qf5 14. Qd3 Qe6 15. Nbd2 Kb8 16. Nb3 h4 17. Nfxd4 Nxd4 18. Nxd4 Qd7 19. Bxf6 gxf6 20. Rad1 Bd6 21. Qf5 Qa4 22. Rd3 hxg3 23. fxg3 Be5 24. Nf3 Qc6 25. Rfd1 Rdg8 26. g4 a6 27. c5 Ka7 28. Qd7 Qe4 29. R1d2 f5 30. Rd4 Bxd4 31. Qxd4 Qc6 32. Qf4 fxg4 33. hxg4 Qg6 34. Ne5 Qb1 35. Nf3 Rh1 36. Kf2 Qf1+ 37. Ke3 Re8+ 38. Kd3 Qb1+ 39. Kd4 Rh7 40. Ne5 Qa1+ 41. Kd5 c6+ 42. Kd6 Qxe5+ 43. Qxe5 Rh6+ 44. Qf6 Rxf6+ 45. Kd7 Re5 46. Rd6 Rf7+ 47. Kd8 Rd5 48. Ke8 Rg7 49. e4 Re5+ 50. Kf8 Rxg4 51. a4 Rgxe4 52. b5 cxb5 53. axb5 Rxc5 0-1

[Event "Oklahoma State-ch"]
[Site "Oklahoma"]
[Date "2006.07.15"]
[Round "3"]
[White "Chambers, Rory"]
[Black "Claassen, Chris"]
[Result "1-0"]
[ECO "D09"]
[BlackElo "2060"]
[PlyCount "63"]
[EventDate "2006.07.15"]
[EventType "swiss"]
[EventRounds "5"]
[EventCountry "USA"]
[SourceTitle "CBM 113 Extra"]
[Source "ChessBase"]
[SourceDate "2006.09.14"]
[SourceVersion "1"]
[SourceVersionDate "2006.09.14"]
[SourceQuality "1"]

1. d4 d5 2. c4 e5 3. dxe5 d4 4. Nf3 Nc6 5. g3 Bg4 6. Bg2 Qd7 7. h3 Be6 8. Nbd2 0-0-0 9. a3 Nge7 10. Ng5 Nxe5 11. 0-0 Nf5 12. Qc2 d3 13. exd3 Nd4 14. Qd1 Nxd3 15. Ndf3 Nf5 16. Qc2 Nxc1 17. Raxc1 Bc5 18. Rfd1 Qe7 19. b4 Ne3 20. Rxd8+ Rxd8 21. Qe4 Nxg2 22. bxc5 Qxc5 23. Nxe6 fxe6 24. Kxg2 Qxa3 25. Qxe6+ Kb8 26. Rd1 Rf8 27. Ne5 Ka8 28. Qd7 a6 29. Qxc7 Ka7 30. Nc6+ Ka8 31. Qd8+ Rxd8 32. Rxd8# 1-0

[Event "Oklahoma State-ch"]
[Site "Oklahoma"]
[Date "2006.07.15"]
[Round "1"]
[White "Claassen, Chris"]
[Black "Orton, William R"]
[Result "0-1"]
[ECO "D20"]
[WhiteElo "2060"]
[BlackElo "2137"]
[PlyCount "114"]
[EventDate "2006.07.15"]
[EventType "swiss"]
[EventRounds "5"]
[EventCountry "USA"]
[SourceTitle "CBM 113 Extra"]
[Source "ChessBase"]
[SourceDate "2006.09.14"]
[SourceVersion "1"]
[SourceVersionDate "2006.09.14"]
[SourceQuality "1"]

1. d4 d5 2. c4 dxc4 3. e3 e5 4. Bxc4 exd4 5. exd4 Bb4+ 6. Nc3 Nf6 7. Nf3 0-0 8. 0-0 Bg4 9. Be3 Nbd7 10. a3 Be7 11. Be2 Nb6 12. Ne5 Bxe2 13. Qxe2 c6 14. Rad1 Nbd5 15. Nxd5 Nxd5 16. Qc4 Bd6 17. Nf3 Re8 18. Rfe1 Qd7 19. Qc2 Qg4 20. h3 Qg6 21. Qb3 Rab8 22. Bc1 f6 23. Rxe8+ Qxe8 24. Re1 Qf7 25. Qd3 Re8 26. Re4 Rxe4 27. Qxe4 Qe7 28. Qd3 Bf4 29. Bd2 Bxd2 30. Qxd2 a6 31. Kf1 Qe4 32. Qe1 Qxe1+ 33. Nxe1 Kf7 34. g3 Ke6 35. Ke2 Nc7 36. Kd3 f5 37. Nf3 Kd5 38. Ne1 Ne6 39. Nc2 g6 40. Ne3+ Kd6 41. Nc4+ Kc7 42. b4 b5 43. Nb2 Kd6 44. Nd1 Nc7 45. h4 Nd5 46. f3 Nf6 47. Nf2 Nh5 48. g4 Nf4+ 49. Kc3 h5 50. gxf5 gxf5 51. Nd3 Ng6 52. Kd2 Nxh4 53. Ke3 Ng6 54. f4 Kd5 55. Ne5 Ne7 56. Nd7 h4 57. Nf6+ Kc4 0-1

[Event "Oklahoma State-ch"]
[Site "Oklahoma"]
[Date "2006.07.15"]
[Round "2"]
[White "Wharry, Stephen M"]
[Black "Claassen, Chris"]
[Result "0-1"]
[ECO "B99"]
[BlackElo "2060"]
[PlyCount "46"]
[EventDate "2006.07.15"]
[EventType "swiss"]
[EventRounds "5"]
[EventCountry "USA"]
[SourceTitle "CBM 113 Extra"]
[Source "ChessBase"]
[SourceDate "2006.09.14"]
[SourceVersion "1"]
[SourceVersionDate "2006.09.14"]
[SourceQuality "1"]

1. e4 c5 2. Nf3 d6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 a6 6. Bg5 e6 7. f4 h6 8. Bh4 Be7 9. Qf3 Qc7 10. 0-0-0 Nbd7 11. g4 g5 12. fxg5 Ne5 13. Qe2 Nfxg4 14. Bh3 hxg5 15. Bxg4 gxh4 16. Rhg1 Bd7 17. Nf3 Nxg4 18. Rxg4 0-0-0 19. Rg7 Bf6 20. Rxf7 Bxc3 21. bxc3 Qxc3 22. Nd4 Qa1+ 23. Kd2 Qxd4+ 0-1

[Event "North American op 25th"]
[Site "Stillwater"]
[Date "2006.05.29"]
[Round "6"]
[White "Claassen, Chris"]
[Black "Veal, Joe Dean"]
[Result "0-1"]
[ECO "E76"]
[WhiteElo "2069"]
[PlyCount "51"]
[EventDate "2006.05.27"]
[EventType "swiss"]
[EventRounds "7"]
[EventCountry "USA"]
[SourceTitle "CBM 112 Extra"]
[Source "ChessBase"]
[SourceDate "2006.07.14"]
[SourceVersion "1"]
[SourceVersionDate "2006.07.14"]
[SourceQuality "1"]

1. d4 Nf6 2. c4 g6 3. Nc3 Bg7 4. e4 d6 5. f4 0-0 6. Nf3 Na6 7. Be2 e5 8. fxe5 dxe5 9. d5 Nc5 10. Qc2 Nfxe4 11. Nxe4 Bf5 12. Bd3 Bxe4 13. Bxe4 f5 14. Bg5 Qd7 15. Bxf5 gxf5 16. 0-0-0 e4 17. Nd4 Nd3+ 18. Rxd3 exd3 19. Qxd3 Rae8 20. Rd1 Bxd4 21. Qxd4 Re4 22. Qc3 Qa4 23. b3 Qxa2 24. Bh6 Rf7 25. h3 f4 26. Qf3 0-1

[Event "North American op 25th"]
[Site "Stillwater"]
[Date "2006.05.29"]
[Round "7"]
[White "Whitcomb, Bran"]
[Black "Claassen, Chris"]
[Result "1/2-1/2"]
[ECO "B53"]
[BlackElo "2069"]
[PlyCount "81"]
[EventDate "2006.05.27"]
[EventType "swiss"]
[EventRounds "7"]
[EventCountry "USA"]
[SourceTitle "CBM 112 Extra"]
[Source "ChessBase"]
[SourceDate "2006.07.14"]
[SourceVersion "1"]
[SourceVersionDate "2006.07.14"]
[SourceQuality "1"]

1. e4 c5 2. Nf3 d6 3. d4 cxd4 4. Qxd4 Nc6 5. Bb5 e5 6. Qd3 Nf6 7. Bg5 Be7 8. Nc3 0-0 9. Bxc6 bxc6 10. 0-0-0 Ne8 11. Bxe7 Qxe7 12. Nd2 Be6 13. Nc4 Rd8 14. Kb1 f6 15. Ne3 Qb7 16. g4 Nc7 17. Nf5 Bxf5 18. gxf5 d5 19. Rhg1 d4 20. Na4 Na6 21. Qc4+ Kh8 22. Nc5 Nxc5 23. Qxc5 Rb8 24. b3 Rf7 25. Rd3 Qb5 26. Qa3 c5 27. c4 Qxc4 28. Rdg3 Qb5 29. Qb2 d3 30. Rc1 Rd7 31. Rgg1 d2 32. Rcd1 Qe2 33. Qc2 Qxf2 34. Rg3 Rbd8 35. Rc3 Qxh2 36. Rxc5 Qe2 37. Rd5 Rxd5 38. exd5 Qf3 39. Rxd2 h6 40. d6 Qb7 41. Qc7 1/2-1/2

[Event "North American op 25th"]
[Site "Stillwater"]
[Date "2006.05.28"]
[Round "4"]
[White "Claassen, Chris"]
[Black "Orton, William R"]
[Result "1/2-1/2"]
[ECO "D20"]
[WhiteElo "2069"]
[BlackElo "2147"]
[PlyCount "34"]
[EventDate "2006.05.27"]
[EventType "swiss"]
[EventRounds "7"]
[EventCountry "USA"]
[SourceTitle "CBM 112 Extra"]
[Source "ChessBase"]
[SourceDate "2006.07.14"]
[SourceVersion "1"]
[SourceVersionDate "2006.07.14"]
[SourceQuality "1"]

1. d4 d5 2. c4 dxc4 3. e3 e5 4. Bxc4 exd4 5. exd4 Nf6 6. Nf3 Be7 7. 0-0 0-0 8. h3 Nbd7 9. Nc3 Nb6 10. Bb3 c6 11. Bg5 Nfd5 12. Bxe7 Nxe7 13. Re1 Bf5 14. Nh4 Bg6 15. Qg4 Ned5 16. Nxg6 hxg6 17. Rad1 Re8 1/2-1/2

[Event "North American op 25th"]
[Site "Stillwater"]
[Date "2006.05.28"]
[Round "5"]
[White "Wallace, David A"]
[Black "Claassen, Chris"]
[Result "1/2-1/2"]
[ECO "D02"]
[BlackElo "2069"]
[PlyCount "77"]
[EventDate "2006.05.27"]
[EventType "swiss"]
[EventRounds "7"]
[EventCountry "USA"]
[SourceTitle "CBM 112 Extra"]
[Source "ChessBase"]
[SourceDate "2006.07.14"]
[SourceVersion "1"]
[SourceVersionDate "2006.07.14"]
[SourceQuality "1"]

1. d4 Nf6 2. Bf4 d5 3. e3 e6 4. Nf3 c5 5. Nbd2 Nc6 6. c3 Nh5 7. Bg5 Qb6 8. Rb1 h6 9. Bh4 cxd4 10. cxd4 Nf6 11. a3 Be7 12. Bd3 0-0 13. Rg1 Qc7 14. Rc1 Ne8 15. Bg3 Qd8 16. Bf4 Nd6 17. g4 g5 18. Bb1 Ne4 19. Qc2 f5 20. gxf5 exf5 21. Qd1 Rf7 22. Ne5 Nxe5 23. Bxe5 Bf6 24. Bxf6 Qxf6 25. f4 g4 26. Bxe4 Qh4+ 27. Kf1 dxe4 28. Kg2 Be6 29. Nc4 Bxc4 30. Rxc4 Qh3+ 31. Kf2 Qxh2+ 32. Rg2 Qh4+ 33. Kg1 Rd8 34. d5 Rfd7 35. Rd4 Qh3 36. Qb3 Rd6 37. Qc3 h5 38. Rh2 Qg3+ 39. Rg2 1/2-1/2

[Event "North American op 25th"]
[Site "Stillwater"]
[Date "2006.05.27"]
[Round "2"]
[White "Claassen, Chris"]
[Black "Gossell, Thomas"]
[Result "0-1"]
[ECO "E62"]
[WhiteElo "2069"]
[BlackElo "2237"]
[PlyCount "96"]
[EventDate "2006.05.27"]
[EventType "swiss"]
[EventRounds "7"]
[EventCountry "USA"]
[SourceTitle "CBM 112 Extra"]
[Source "ChessBase"]
[SourceDate "2006.07.14"]
[SourceVersion "1"]
[SourceVersionDate "2006.07.14"]
[SourceQuality "1"]

1. d4 Nf6 2. Nf3 e6 3. c4 Nc6 4. a3 d6 5. Nc3 g6 6. g3 Bg7 7. Bg2 0-0 8. 0-0 Re8 9. e4 e5 10. d5 Nd4 11. Ne1 c5 12. h3 a6 13. a4 Bd7 14. f4 Nh5 15. Kh2 exf4 16. Bxf4 Nxf4 17. gxf4 b5 18. axb5 axb5 19. Rxa8 Qxa8 20. cxb5 Nxb5 21. Qd3 Qa5 22. Rf3 Qb4 23. Nc2 Qb3 24. Nd1 Qxd3 25. Rxd3 f5 26. Re3 Kf7 27. Kg3 fxe4 28. Rxe4 Bf5 29. Rxe8 Kxe8 30. Nce3 Nd4 31. Nxf5 Nxf5+ 32. Kf3 Bd4 33. Bf1 Kf7 34. Bc4 Kf6 35. Nc3 Bxc3 36. bxc3 Ne7 37. Kg4 Nc8 38. Bd3 Nb6 39. c4 Nc8 40. Kf3 Ne7 41. Kg4 Ng8 42. Kf3 Nh6 43. Kg3 Nf5+ 44. Kf3 Nd4+ 45. Kg3 h6 46. Kg4 g5 47. fxg5+ hxg5 48. Bb1 Nb3 0-1

[Event "North American op 25th"]
[Site "Stillwater"]
[Date "2006.05.27"]
[Round "3"]
[White "Strain, Milt"]
[Black "Claassen, Chris"]
[Result "0-1"]
[ECO "A47"]
[BlackElo "2069"]
[PlyCount "80"]
[EventDate "2006.05.27"]
[EventType "swiss"]
[EventRounds "7"]
[EventCountry "USA"]
[SourceTitle "CBM 112 Extra"]
[Source "ChessBase"]
[SourceDate "2006.07.14"]
[SourceVersion "1"]
[SourceVersionDate "2006.07.14"]
[SourceQuality "1"]

1. d4 Nf6 2. Nf3 e6 3. Bg5 b6 4. Bxf6 Qxf6 5. e4 Bb7 6. Nbd2 c5 7. c3 cxd4 8. cxd4 Bb4 9. Bd3 Nc6 10. e5 Qf4 11. 0-0 Nxd4 12. Nxd4 Qxd4 13. Nf3 Qg4 14. Be2 Bc6 15. Rc1 b5 16. a3 Be7 17. Qd3 0-0 18. h3 Qf4 19. Rfe1 a6 20. g3 Qh6 21. Kh2 f5 22. Nd4 Be4 23. Qb3 f4 24. g4 Bd5 25. Qd3 f3 26. Bf1 Bg5 27. Rc5 Bf4+ 28. Kg1 Bc4 29. Rxc4 bxc4 30. Qxc4 Bg5 31. Rd1 Kh8 32. Qd3 Bh4 33. Qe4 Rab8 34. b4 Rf4 35. Qd3 Rbf8 36. Nc2 Qg5 37. Qxd7 Rxg4+ 38. hxg4 Qxg4+ 39. Kh2 Bxf2 40. Bh3 Qg3+ 0-1

[Event "Wichita NAO Tune up"]
[Site "Wichita"]
[Date "2006.05.21"]
[Round "5"]
[White "Claassen, Chris"]
[Black "Chua, Alexander J"]
[Result "0-1"]
[ECO "D40"]
[WhiteElo "2069"]
[BlackElo "2208"]
[PlyCount "104"]
[EventDate "2006.05.20"]
[EventType "swiss"]
[EventRounds "5"]
[EventCountry "USA"]
[SourceTitle "CBM 112 Extra"]
[Source "ChessBase"]
[SourceDate "2006.07.14"]
[SourceVersion "1"]
[SourceVersionDate "2006.07.14"]
[SourceQuality "1"]

1. d4 d5 2. c4 e6 3. Nc3 c5 4. e3 Nf6 5. Nf3 Nc6 6. Bd3 a6 7. 0-0 dxc4 8. Bxc4 b5 9. Bd3 Bb7 10. a3 cxd4 11. exd4 Be7 12. Bg5 0-0 13. Bc2 h6 14. Bh4 Rc8 15. Qd3 g6 16. Rfe1 Nd5 17. Bxe7 Ncxe7 18. Ne5 Nf5 19. Qd2 Qg5 20. Qxg5 hxg5 21. Bxf5 gxf5 22. Nxd5 Bxd5 23. Rac1 Kg7 24. Nd7 Rfd8 25. Nc5 a5 26. f3 Rb8 27. b3 b4 28. a4 Rd6 29. Kf2 Rbd8 30. Red1 Ba8 31. Ke3 f4+ 32. Ke2 Rxd4 33. Rxd4 Rxd4 34. Nd3 Bd5 35. Rb1 f6 36. Ne1 Bb7 37. Rb2 Rd6 38. Rc2 Rc6 39. Rd2 Ba6+ 40. Kf2 Rc3 41. Rd7+ Kg6 42. Rd6 Bc8 43. Rd8 Kf7 44. Rd3 Rxd3 45. Nxd3 e5 46. Nc5 Be6 47. Ke2 Bd5 48. g3 Ke7 49. gxf4 exf4 50. Kf2 Kd6 51. Ne4+ Bxe4 52. fxe4 g4 0-1

[Event "Wichita NAO Tune up"]
[Site "Wichita"]
[Date "2006.05.21"]
[Round "4"]
[White "Claassen, Chris"]
[Black "Pasik, Ron J"]
[Result "1-0"]
[ECO "A69"]
[WhiteElo "2069"]
[PlyCount "61"]
[EventDate "2006.05.20"]
[EventType "swiss"]
[EventRounds "5"]
[EventCountry "USA"]
[SourceTitle "CBM 112 Extra"]
[Source "ChessBase"]
[SourceDate "2006.07.14"]
[SourceVersion "1"]
[SourceVersionDate "2006.07.14"]
[SourceQuality "1"]

1. d4 Nf6 2. c4 g6 3. Nc3 Bg7 4. e4 d6 5. f4 0-0 6. Nf3 c5 7. d5 e6 8. Be2 exd5 9. cxd5 Re8 10. e5 dxe5 11. fxe5 Ng4 12. Bg5 Qb6 13. 0-0 c4+ 14. Kh1 Nf2+ 15. Rxf2 Qxf2 16. Ne4 Qb6 17. Nd6 Rf8 18. Be7 Bd7 19. Nxc4 Qc7 20. Bxf8 Bxf8 21. Rc1 Bh6 22. Rc3 Na6 23. Nd6 Qa5 24. Nxb7 Qxa2 25. Nd6 Nb4 26. Nxf7 Kxf7 27. e6+ Bxe6 28. dxe6+ Kg8 29. e7 Qa5 30. Qd7 Qa1+ 31. Ng1 1-0

[Event "Wichita NAO Tune up"]
[Site "Wichita"]
[Date "2006.05.20"]
[Round "1"]
[White "Claassen, Chris"]
[Black "Sirin, Atakan"]
[Result "0-1"]
[ECO "A56"]
[WhiteElo "2069"]
[BlackElo "2070"]
[PlyCount "50"]
[EventDate "2006.05.20"]
[EventType "swiss"]
[EventRounds "5"]
[EventCountry "USA"]
[SourceTitle "CBM 112 Extra"]
[Source "ChessBase"]
[SourceDate "2006.07.14"]
[SourceVersion "1"]
[SourceVersionDate "2006.07.14"]
[SourceQuality "1"]

1. d4 c5 2. d5 e5 3. c4 d6 4. e4 Be7 5. Nf3 Nf6 6. Nc3 0-0 7. Be2 Na6 8. h3 h6 9. 0-0 Nh7 10. Nh2 Bg5 11. Ng4 h5 12. Nh2 g6 13. Nf3 Bxc1 14. Qxc1 Kg7 15. Qe3 f5 16. exf5 gxf5 17. Nxe5 dxe5 18. Qxe5+ Qf6 19. Qg3+ Kh8 20. Bxh5 f4 21. Qd3 Nb4 22. Qd2 Qh4 23. Bg4 Bxg4 24. hxg4 f3 25. Qe3 Rae8 0-1

[Event "Wichita NAO Tune up"]
[Site "Wichita"]
[Date "2006.05.20"]
[Round "3"]
[White "Coleman, Maxx W"]
[Black "Claassen, Chris"]
[Result "1-0"]
[ECO "B90"]
[BlackElo "2069"]
[PlyCount "45"]
[EventDate "2006.05.20"]
[EventType "swiss"]
[EventRounds "5"]
[EventCountry "USA"]
[SourceTitle "CBM 112 Extra"]
[Source "ChessBase"]
[SourceDate "2006.07.14"]
[SourceVersion "1"]
[SourceVersionDate "2006.07.14"]
[SourceQuality "1"]

1. e4 c5 2. Nf3 d6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 a6 6. f3 Qb6 7. Nb3 e6 8. Qe2 Qc7 9. Be3 Nbd7 10. g4 h6 11. h4 b5 12. a3 Nb6 13. Nd2 Bb7 14. Qf2 Nfd7 15. f4 d5 16. Bg2 dxe4 17. Ndxe4 b4 18. axb4 Bxb4 19. 0-0 Nc4 20. Bd4 f6 21. Ra4 Bxc3 22. Rxc4 Bxd4 23. Qxd4 1-0

[Event "Wichita NAO Tune up"]
[Site "Wichita"]
[Date "2006.05.20"]
[Round "2"]
[White "Foulkrod, William"]
[Black "Claassen, Chris"]
[Result "0-1"]
[ECO "B30"]
[BlackElo "2069"]
[PlyCount "84"]
[EventDate "2006.05.20"]
[EventType "swiss"]
[EventRounds "5"]
[EventCountry "USA"]
[SourceTitle "CBM 112 Extra"]
[Source "ChessBase"]
[SourceDate "2006.07.14"]
[SourceVersion "1"]
[SourceVersionDate "2006.07.14"]
[SourceQuality "1"]

1. e4 c5 2. Bc4 e6 3. d3 Nc6 4. Nf3 h6 5. Nc3 d6 6. 0-0 Nf6 7. Re1 Be7 8. Re3 0-0 9. h3 d5 10. Nh2 dxc4 11. dxc4 Qxd1+ 12. Nxd1 Rd8 13. Nc3 Nd4 14. Rg3 Bd6 15. Bxh6 Bxg3 16. Bg5 Bxh2+ 17. Kxh2 e5 18. Bxf6 gxf6 19. Nd5 Be6 20. Nxf6+ Kg7 21. Nh5+ Kg6 22. Ng3 Nxc2 23. Rc1 Nb4 24. a3 Nd3 25. Rc3 Nxb2 26. f3 Nxc4 27. h4 b5 28. Nf1 Rd1 29. Kg1 Nd2 30. g4 Rxf1+ 31. Kg2 Bc4 32. a4 Be2 33. axb5 Bxf3+ 34. Rxf3 Rxf3 35. b6 axb6 36. h5+ Kg5 37. h6 Kxh6 38. g5+ Kh5 39. g6 Rg8 40. Kh1 Rxg6 41. Kh2 Nf1+ 42. Kh1 Rh3# 0-1

[Event "Bartlesville Phillips 66 op"]
[Site "Bartlesville"]
[Date "2006.03.26"]
[Round "4"]
[White "Berry, Jim"]
[Black "Claassen, Chris"]
[Result "0-1"]
[ECO "B90"]
[BlackElo "2069"]
[PlyCount "112"]
[EventDate "2006.03.25"]
[EventType "swiss"]
[EventRounds "4"]
[EventCountry "USA"]
[SourceTitle "CBM 111 Extra"]
[Source "ChessBase"]
[SourceDate "2006.05.09"]
[SourceVersion "1"]
[SourceVersionDate "2006.05.09"]
[SourceQuality "1"]

1. e4 c5 2. Nf3 d6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 a6 6. f3 e5 7. Nb3 Be6 8. Be3 Nbd7 9. Qd2 Qc7 10. 0-0-0 b5 11. Kb1 Nb6 12. Bxb6 Qxb6 13. g4 Be7 14. h4 Rc8 15. h5 b4 16. Nd5 Nxd5 17. exd5 Bd7 18. Bd3 a5 19. g5 a4 20. Nc1 Qd4 21. Ne2 Qxd5 22. Qxb4 Qc5 23. Qxc5 Rxc5 24. g6 fxg6 25. hxg6 h5 26. Ng3 h4 27. Bf5 d5 28. Bxd7+ Kxd7 29. Ne4 Ra5 30. a3 Ke6 31. Nf2 Rh6 32. Nd3 Kf5 33. Nb4 Bxb4 34. axb4 Rb5 35. c3 Kxg6 36. Ka2 Kh5 37. Ka3 e4 38. Kxa4 Rhb6 39. Rd4 g5 40. fxe4 dxe4 41. Rxe4 g4 42. Rg1 Rg5 43. c4 Ra6+ 44. Kb3 h3 45. b5 Rf6 46. Kb4 h2 47. Rh1 Rf2 48. b3 g3 49. b6 Rg7 50. Ree1 Kg4 51. c5 Rc2 52. Re4+ Kh3 53. Re3 Rh7 54. Rf3 Kg4 55. Rff1 g2 56. Rxh2 Rxh2 0-1

[Event "Bartlesville Phillips 66 op"]
[Site "Bartlesville"]
[Date "2006.03.26"]
[Round "3"]
[White "Lee, Marvin"]
[Black "Claassen, Chris"]
[Result "0-1"]
[ECO "B98"]
[BlackElo "2069"]
[PlyCount "78"]
[EventDate "2006.03.25"]
[EventType "swiss"]
[EventRounds "4"]
[EventCountry "USA"]
[SourceTitle "CBM 111 Extra"]
[Source "ChessBase"]
[SourceDate "2006.05.09"]
[SourceVersion "1"]
[SourceVersionDate "2006.05.09"]
[SourceQuality "1"]

1. e4 c5 2. Nf3 d6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 a6 6. Bg5 e6 7. f4 h6 8. Bh4 Be7 9. Qf3 Qc7 10. g4 Nbd7 11. g5 hxg5 12. Bxg5 b5 13. a3 Bb7 14. f5 e5 15. Nb3 Rc8 16. h4 Nb6 17. Nd2 d5 18. Bd3 d4 19. Na2 Nc4 20. Bxc4 bxc4 21. Bxf6 Bxf6 22. h5 a5 23. Qg4 Qc6 24. c3 Qb6 25. Rb1 d3 26. Rh3 Ba6 27. b3 cxb3 28. Rxb3 Qa7 29. c4 Qd4 30. Rc3 Bxc4 31. Nxc4 Rxc4 32. Rhxd3 Qxe4+ 33. Qxe4 Rxe4+ 34. Kd1 0-0 35. Rh3 Rd8+ 36. Kc2 Re2+ 37. Kb1 e4 38. Rc2 Rb8+ 39. Kc1 Rxc2+ 0-1

[Event "Bartlesville Phillips 66 op"]
[Site "Bartlesville"]
[Date "2006.03.25"]
[Round "2"]
[White "Claassen, Chris"]
[Black "Lee, Mark"]
[Result "1-0"]
[ECO "E51"]
[WhiteElo "2069"]
[PlyCount "91"]
[EventDate "2006.03.25"]
[EventType "swiss"]
[EventRounds "4"]
[EventCountry "USA"]
[SourceTitle "CBM 111 Extra"]
[Source "ChessBase"]
[SourceDate "2006.05.09"]
[SourceVersion "1"]
[SourceVersionDate "2006.05.09"]
[SourceQuality "1"]

1. d4 d5 2. c4 dxc4 3. e3 Nf6 4. Bxc4 e6 5. Nf3 Bd6 6. Nc3 0-0 7. 0-0 Nc6 8. e4 e5 9. d5 Nb4 10. a3 Na6 11. b4 Re8 12. Bg5 Bd7 13. Qd3 Nb8 14. Rfc1 c6 15. Bb3 a6 16. Ra2 b5 17. Rd2 c5 18. bxc5 Bxc5 19. a4 b4 20. Nd1 Bd6 21. Ne3 h6 22. Bh4 g5 23. Bg3 Nh5 24. Nc4 Bg4 25. Nfxe5 Bxe5 26. Bxe5 Nd7 27. Bg3 Nc5 28. Qc2 Nxe4 29. Rd4 Bf5 30. Qb2 Nc3 31. Rd2 Nxg3 32. hxg3 Ne4 33. Re2 Nc3 34. Rd2 Ne4 35. Rd4 Nc3 36. Ne3 Bg4 37. Rxg4 Qb6 38. Re1 a5 39. Qd2 Ne4 40. Qd3 Nc5 41. Qc2 Rac8 42. Rc4 h5 43. Rc1 Nxb3 44. Rxc8 Kf8 45. Rxe8+ Kxe8 46. Qxb3 1-0

[Event "Bartlesville Phillips 66 op"]
[Site "Bartlesville"]
[Date "2006.03.25"]
[Round "1"]
[White "Peters, Robert"]
[Black "Claassen, Chris"]
[Result "0-1"]
[ECO "D38"]
[BlackElo "2069"]
[PlyCount "76"]
[EventDate "2006.03.25"]
[EventType "swiss"]
[EventRounds "4"]
[EventCountry "USA"]
[SourceTitle "CBM 111 Extra"]
[Source "ChessBase"]
[SourceDate "2006.05.09"]
[SourceVersion "1"]
[SourceVersionDate "2006.05.09"]
[SourceQuality "1"]

1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. Bg5 d5 5. Nf3 0-0 6. a3 Bxc3+ 7. bxc3 Nbd7 8. cxd5 exd5 9. Ne5 Qe7 10. Bf4 c6 11. e3 Nxe5 12. Bxe5 Ne4 13. Qc2 Bf5 14. Bd3 Qg5 15. 0-0 Qg6 16. f3 Nd6 17. Bxf5 Nxf5 18. e4 Ne3 19. Qf2 Nxf1 20. Rxf1 dxe4 21. fxe4 f6 22. Bd6 Rfd8 23. Qf4 Qg5 24. Qxg5 fxg5 25. e5 Rd7 26. g4 h6 27. c4 Rad8 28. c5 Rf7 29. Rd1 Rf4 30. h3 Re4 31. Kg2 Kf7 32. Kf3 Rf4+ 33. Kg3 Ke6 34. h4 Rd7 35. a4 Rdf7 36. Rd3 gxh4+ 37. Kxh4 Re4 38. Kh5 Rff4 0-1

[Event "Tulsa OCF Fall op"]
[Site "Tulsa"]
[Date "2005.10.17"]
[Round "5"]
[White "Claassen, Chris"]
[Black "Crockett, Mike"]
[Result "1/2-1/2"]
[ECO "E43"]
[PlyCount "106"]
[EventDate "2005.10.16"]
[EventType "swiss"]
[EventRounds "5"]
[EventCountry "USA"]
[SourceTitle "CBM 108 Extra"]
[Source "ChessBase"]
[SourceDate "2005.11.04"]
[SourceVersion "1"]
[SourceVersionDate "2005.11.04"]
[SourceQuality "1"]

1. d4 e6 2. c4 Nf6 3. Nc3 Bb4 4. e3 0-0 5. Nf3 b6 6. Bd3 Bb7 7. 0-0 Bxc3 8. bxc3 Ne4 9. Nd2 f5 10. f3 Nxd2 11. Bxd2 d6 12. e4 fxe4 13. fxe4 e5 14. Qe2 Nd7 15. Rxf8+ Nxf8 16. Qg4 Qd7 17. Qg3 Re8 18. Re1 Ng6 19. Bc2 Rf8 20. Rf1 Rxf1+ 21. Kxf1 Qf7+ 22. Kg1 Ba6 23. Qd3 Bxc4 24. Qxc4 Qxc4 25. Bb3 Qf7 26. Bxf7+ Kxf7 27. d5 Nf4 28. Kf2 h6 29. h4 Nh5 30. Kf3 Nf6 31. g4 Nd7 32. g5 h5 33. Be3 Nf8 34. Bf2 Ke7 35. Ke3 Kd7 36. Kd3 Ng6 37. Bg3 Kc8 38. Kc2 Kb7 39. Kb3 Ka6 40. a3 Nf4 41. Bf2 g6 42. Be3 Kb5 43. a4+ Ka5 44. c4 Ng2 45. Bf2 a6 46. Ka3 b5 47. axb5 axb5 48. cxb5 Kxb5 49. Kb3 Nf4 50. Be3 c5 51. dxc6 Kxc6 52. Kc4 d5+ 53. exd5+ Nxd5 1/2-1/2

[Event "Tulsa OCF Fall op"]
[Site "Tulsa"]
[Date "2005.10.17"]
[Round "4"]
[White "Claassen, Chris"]
[Black "Lee, Marvin"]
[Result "1-0"]
[ECO "D89"]
[PlyCount "71"]
[EventDate "2005.10.16"]
[EventType "swiss"]
[EventRounds "5"]
[EventCountry "USA"]
[SourceTitle "CBM 108 Extra"]
[Source "ChessBase"]
[SourceDate "2005.11.04"]
[SourceVersion "1"]
[SourceVersionDate "2005.11.04"]
[SourceQuality "1"]

1. d4 Nf6 2. c4 g6 3. Nc3 d5 4. cxd5 Nxd5 5. e4 Nxc3 6. bxc3 Bg7 7. Bc4 0-0 8. Ne2 c5 9. 0-0 Nc6 10. Be3 cxd4 11. cxd4 Bg4 12. f3 Na5 13. Bd3 Be6 14. Rc1 Bxa2 15. d5 Bb2 16. Rc5 Ba3 17. Rb5 Bd6 18. Qa4 Bxd5 19. exd5 b6 20. Qa1 Qc7 21. h3 Be5 22. Bd4 Bxd4+ 23. Qxd4 Nb7 24. Nc3 Nc5 25. Ne4 Nxd3 26. Qxd3 Rac8 27. Qa3 Qd7 28. Rfb1 Rc2 29. d6 Re8 30. Re5 Kg7 31. Rxe7 Rxe7 32. dxe7 f5 33. Qa1+ Kh6 34. Qe5 Rc8 35. Nf6 Qd3 36. Re1 1-0

[Event "Tulsa OCF Fall op"]
[Site "Tulsa"]
[Date "2005.10.16"]
[Round "3"]
[White "Thoma, Philip F"]
[Black "Claassen, Chris"]
[Result "1/2-1/2"]
[ECO "B21"]
[PlyCount "52"]
[EventDate "2005.10.16"]
[EventType "swiss"]
[EventRounds "5"]
[EventCountry "USA"]
[SourceTitle "CBM 108 Extra"]
[Source "ChessBase"]
[SourceDate "2005.11.04"]
[SourceVersion "1"]
[SourceVersionDate "2005.11.04"]
[SourceQuality "1"]

1. e4 c5 2. d4 cxd4 3. c3 d3 4. c4 e5 5. Bxd3 Bc5 6. Nf3 d6 7. 0-0 Bg4 8. Nc3 Ne7 9. Rb1 Nbc6 10. Be2 0-0 11. Nd5 a5 12. h3 Bxf3 13. Bxf3 Nxd5 14. cxd5 Nd4 15. Be3 Rc8 16. Bxd4 Bxd4 17. Qa4 Qb6 18. g3 Rc7 19. b4 axb4 20. Rxb4 Qc5 21. Be2 Qc3 22. Qb3 Qd2 23. Rc4 Rfc8 24. Rxc7 Rxc7 25. Bc4 g6 26. Kg2 Qg5 1/2-1/2

[Event "Tulsa OCF Challengers"]
[Site "Tulsa"]
[Date "2005.09.05"]
[Round "7"]
[White "Claassen, Chris"]
[Black "Galant, Sergey"]
[Result "0-1"]
[ECO "A40"]
[BlackElo "2211"]
[PlyCount "52"]
[EventDate "2005.09.03"]
[EventType "tourn"]
[EventRounds "7"]
[EventCountry "USA"]
[SourceTitle "CBM 108 Extra"]
[Source "ChessBase"]
[SourceDate "2005.11.04"]
[SourceVersion "1"]
[SourceVersionDate "2005.11.04"]
[SourceQuality "1"]

1. d4 f5 2. c4 Nf6 3. Nc3 e6 4. Nf3 Be7 5. g3 b6 6. Bg2 Bb7 7. 0-0 0-0 8. a3 Kh8 9. b4 a5 10. Rb1 Ne4 11. Qb3 axb4 12. axb4 Nc6 13. c5 Bf6 14. Rd1 bxc5 15. bxc5 Ba6 16. Qc2 Nxc3 17. Qxc3 Bxe2 18. Rd2 Ba6 19. Ne5 Qe8 20. Rdb2 Rd8 21. Qa3 Nxd4 22. Qxa6 Bxe5 23. f4 Bf6 24. Rb7 c6 25. Bd2 Qh5 26. Qd3 Qe2 0-1

[Event "Tulsa OCF Challengers"]
[Site "Tulsa"]
[Date "2005.09.05"]
[Round "6"]
[White "Karagianis, Pete"]
[Black "Claassen, Chris"]
[Result "1-0"]
[ECO "E12"]
[WhiteElo "2259"]
[PlyCount "101"]
[EventDate "2005.09.03"]
[EventType "tourn"]
[EventRounds "7"]
[EventCountry "USA"]
[SourceTitle "CBM 108 Extra"]
[Source "ChessBase"]
[SourceDate "2005.11.04"]
[SourceVersion "1"]
[SourceVersionDate "2005.11.04"]
[SourceQuality "1"]

1. d4 Nf6 2. c4 e6 3. Nf3 b6 4. a3 Bb7 5. Nc3 Be7 6. Qc2 d5 7. cxd5 exd5 8. Bf4 a6 9. e3 Nbd7 10. Bd3 h6 11. 0-0 0-0 12. h3 Rc8 13. Qe2 b5 14. b4 Nb6 15. Nd2 Bd6 16. Bxd6 Qxd6 17. Nb3 Nbd7 18. Rac1 Rfe8 19. Rc2 Ne4 20. Na2 Ba8 21. Rfc1 f5 22. a4 bxa4 23. Na5 Nb8 24. b5 axb5 25. Bxb5 Re7 26. Bxa4 f4 27. Bc6 Bxc6 28. Nxc6 Nxc6 29. Rxc6 Qd7 30. Nb4 fxe3 31. fxe3 Ng3 32. Qf3 Ne4 33. Qh5 Nf6 34. Rxf6 gxf6 35. Nxd5 Re6 36. Qg4+ Kf7 37. Nf4 Rd6 38. Qg6+ Ke7 39. Qg7+ Kd8 40. Qxh6 Qe8 41. Nd3 Rb8 42. Nc5 Rbb6 43. Ra1 Rb8 44. Nb7+ Rxb7 45. Ra8+ Kd7 46. Rxe8 Kxe8 47. Qg6+ Kf8 48. h4 c6 49. h5 Rg7 50. Qf5 Kg8 51. h6 1-0

[Event "Tulsa OCF Challengers"]
[Site "Tulsa"]
[Date "2005.09.04"]
[Round "5"]
[White "Claassen, Chris"]
[Black "Berry, James E"]
[Result "1-0"]
[ECO "D10"]
[BlackElo "2184"]
[PlyCount "37"]
[EventDate "2005.09.03"]
[EventType "tourn"]
[EventRounds "7"]
[EventCountry "USA"]
[SourceTitle "CBM 108 Extra"]
[Source "ChessBase"]
[SourceDate "2005.11.04"]
[SourceVersion "1"]
[SourceVersionDate "2005.11.04"]
[SourceQuality "1"]

1. d4 c6 2. c4 d5 3. Nc3 e5 4. dxe5 d4 5. Ne4 Qa5+ 6. Nd2 Qxe5 7. Ngf3 Qf6 8. Ne4 Qg6 9. Qxd4 Bb4+ 10. Bd2 Bxd2+ 11. Nexd2 Nf6 12. Ne5 Qh6 13. e3 0-0 14. c5 Be6 15. Be2 Na6 16. Bxa6 Rfd8 17. Qf4 Nd5 18. Qxh6 gxh6 19. Bxb7 1-0

[Event "Tulsa OCF Challengers"]
[Site "Tulsa"]
[Date "2005.09.04"]
[Round "4"]
[White "Claassen, Chris"]
[Black "McEntee, Tim R"]
[Result "1/2-1/2"]
[ECO "D88"]
[PlyCount "107"]
[EventDate "2005.09.03"]
[EventType "tourn"]
[EventRounds "7"]
[EventCountry "USA"]
[SourceTitle "CBM 108 Extra"]
[Source "ChessBase"]
[SourceDate "2005.11.04"]
[SourceVersion "1"]
[SourceVersionDate "2005.11.04"]
[SourceQuality "1"]

1. d4 Nf6 2. c4 g6 3. Nc3 d5 4. cxd5 Nxd5 5. e4 Nxc3 6. bxc3 Bg7 7. Bc4 0-0 8. Ne2 c5 9. 0-0 Nc6 10. Be3 Na5 11. Bd3 cxd4 12. cxd4 b6 13. Rc1 Bb7 14. Qd2 Qd7 15. f3 Rfc8 16. Kh1 Rxc1 17. Rxc1 Rc8 18. Rxc8+ Qxc8 19. Qc1 Qxc1+ 20. Bxc1 Nc6 21. Be3 a6 22. Kg1 b5 23. Kf1 e6 24. Ke1 Bf8 25. Bd2 Bd6 26. g3 f5 27. Kf2 Ba3 28. Bc2 Kf7 29. Ke3 Ke7 30. Bb3 fxe4 31. fxe4 Bb2 32. Bc3 Bxc3 33. Nxc3 Na5 34. Kd3 Nxb3 35. axb3 Kd6 36. e5+ Kc7 37. b4 Bg2 38. Ke3 g5 39. Kd3 Kb6 40. Kd2 a5 41. bxa5+ Kxa5 42. Kc2 b4 43. Nd1 Ka4 44. Kb2 b3 45. Ne3 Be4 46. Nd1 Kb4 47. Nc3 Bf5 48. d5 exd5 49. Nxd5+ Kc5 50. Nf6 Kd4 51. e6 Bxe6 52. Nxh7 g4 53. Ng5 Bg8 54. h3 1/2-1/2

[Event "Tulsa OCF Challengers"]
[Site "Tulsa"]
[Date "2005.09.04"]
[Round "3"]
[White "Latino, Carl D"]
[Black "Claassen, Chris"]
[Result "0-1"]
[ECO "A45"]
[PlyCount "102"]
[EventDate "2005.09.03"]
[EventType "tourn"]
[EventRounds "7"]
[EventCountry "USA"]
[SourceTitle "CBM 108 Extra"]
[Source "ChessBase"]
[SourceDate "2005.11.04"]
[SourceVersion "1"]
[SourceVersionDate "2005.11.04"]
[SourceQuality "1"]

1. d4 Nf6 2. Bg5 Ne4 3. Bh4 c5 4. f3 g5 5. fxe4 gxh4 6. e3 Bh6 7. Bc4 Qb6 8. b3 Qg6 9. Qf3 Nc6 10. c3 d6 11. Be2 Rg8 12. g3 Bg5 13. Nd2 Qh6 14. Nf1 Bd7 15. g4 Bf6 16. h3 0-0-0 17. Nd2 Kb8 18. Nc4 Rc8 19. Bd3 Bg5 20. Kf2 cxd4 21. exd4 Nd8 22. Ne2 Ne6 23. e5 d5 24. Ne3 Nf4 25. Nxf4 Bxf4 26. Nxd5 Bg3+ 27. Ke2 Bc6 28. Be4 Rgd8 29. c4 e6 30. Ne3 Rxd4 31. Bxc6 Rf4 32. Bxb7 Rxf3 33. Bxf3 Bf4 34. Nc2 Bxe5 35. Rad1 Kc7 36. Nb4 Qf4 37. Nc6 Bd6 38. Rd4 Qf6 39. Rhd1 Bc5 40. Rd7+ Kb6 41. Nxa7 Rc7 42. Rxc7 Kxc7 43. Nb5+ Kc8 44. Nd6+ Bxd6 45. Be4 Qe5 46. Kd3 Bc5 47. Bxh7 Qe3+ 48. Kc2 Bb4 49. Bd3 Qf2+ 50. Kb1 Ba3 51. Bc2 Qf6 0-1

[Event "Tulsa OCF Challengers"]
[Site "Tulsa"]
[Date "2005.09.03"]
[Round "2"]
[White "Claassen, Chris"]
[Black "Ellis, James S"]
[Result "0-1"]
[ECO "E41"]
[BlackElo "2119"]
[PlyCount "88"]
[EventDate "2005.09.03"]
[EventType "tourn"]
[EventRounds "7"]
[EventCountry "USA"]
[SourceTitle "CBM 108 Extra"]
[Source "ChessBase"]
[SourceDate "2005.11.04"]
[SourceVersion "1"]
[SourceVersionDate "2005.11.04"]
[SourceQuality "1"]

1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. e3 c5 5. Bd3 Nc6 6. Nf3 Bxc3+ 7. bxc3 d6 8. 0-0 e5 9. d5 Ne7 10. e4 h6 11. h3 0-0 12. Ne1 Nh7 13. f4 Ng6 14. f5 Nh8 15. Qf3 f6 16. Qg3 Nf7 17. Nf3 Bd7 18. Nh4 b5 19. Ng6 Re8 20. Rb1 bxc4 21. Bxc4 Rb8 22. Bd2 Qc7 23. h4 Nf8 24. h5 Nh7 25. Qd3 Nhg5 26. Nh4 Rxb1 27. Rxb1 Rb8 28. Ng6 Nd8 29. Rf1 Ba4 30. Bxg5 hxg5 31. Qh3 Nf7 32. Qd3 Rb2 33. Rf2 Qb6 34. Rxb2 Qxb2 35. Ne7+ Kh7 36. Nc6 Qc1+ 37. Kh2 Qf4+ 38. Kg1 Nh6 39. Qf3 Qc1+ 40. Bf1 Bd1 41. Qd3 Ng4 42. Qg3 Ne3 43. Qf2 Bc2 44. Nxa7 Bd3 0-1

[Event "Tulsa OCF Challengers"]
[Site "Tulsa"]
[Date "2005.09.03"]
[Round "1"]
[White "Orton, William R"]
[Black "Claassen, Chris"]
[Result "1-0"]
[ECO "B22"]
[WhiteElo "2125"]
[PlyCount "33"]
[EventDate "2005.09.03"]
[EventType "tourn"]
[EventRounds "7"]
[EventCountry "USA"]
[SourceTitle "CBM 108 Extra"]
[Source "ChessBase"]
[SourceDate "2005.11.04"]
[SourceVersion "1"]
[SourceVersionDate "2005.11.04"]
[SourceQuality "1"]

1. e4 c5 2. c3 d5 3. exd5 Qxd5 4. d4 cxd4 5. cxd4 Nc6 6. Nf3 Bg4 7. Nc3 Qh5 8. d5 Bxf3 9. gxf3 0-0-0 10. Qb3 Ne5 11. Be2 Qf5 12. Be3 Nxf3+ 13. Bxf3 Qxf3 14. Rg1 e6 15. Rc1 Rd7 16. Nb5+ Kd8 17. Bb6+ 1-0

[Event "Jerry Spann Memorial"]
[Site "Norman"]
[Date "2005.06.19"]
[Round "5"]
[White "Claassen, Chris"]
[Black "Galant, Sergey"]
[Result "0-1"]
[ECO "D35"]
[BlackElo "2211"]
[PlyCount "66"]
[EventDate "2005.06.18"]
[EventType "swiss"]
[EventRounds "5"]
[EventCountry "USA"]
[SourceTitle "CBM 106 Extra"]
[Source "ChessBase"]
[SourceDate "2005.07.01"]
[SourceVersion "1"]
[SourceVersionDate "2005.07.01"]
[SourceQuality "1"]

1. d4 d5 2. c4 e6 3. Nc3 Nf6 4. cxd5 exd5 5. Bg5 c6 6. Qc2 Nbd7 7. e3 Bd6 8. Bd3 Qa5 9. Nge2 0-0 10. 0-0 h6 11. Bh4 Qc7 12. h3 Re8 13. Rac1 a6 14. a3 Qb8 15. b4 a5 16. Qb2 axb4 17. axb4 b5 18. Ra1 Rxa1 19. Rxa1 Nh5 20. Bb1 g5 21. g4 gxh4 22. gxh5 Nf6 23. Qd2 Bxh3 24. e4 Ng4 25. e5 Bxe5 26. dxe5 Qxe5 27. Bh7+ Kxh7 28. Qd3+ Kh8 29. Qxh3 Rg8 30. Ra2 d4 31. f4 Qe6 32. Qxh4 dxc3 33. Ra3 Qxe2 0-1

[Event "Jerry Spann Memorial"]
[Site "Norman"]
[Date "2005.06.19"]
[Round "4"]
[White "Ferguson, Jake A"]
[Black "Claassen, Chris"]
[Result "1/2-1/2"]
[ECO "B30"]
[PlyCount "33"]
[EventDate "2005.06.18"]
[EventType "swiss"]
[EventRounds "5"]
[EventCountry "USA"]
[SourceTitle "CBM 106 Extra"]
[Source "ChessBase"]
[SourceDate "2005.07.01"]
[SourceVersion "1"]
[SourceVersionDate "2005.07.01"]
[SourceQuality "1"]

1. Nf3 c5 2. e4 d6 3. d3 Nc6 4. g3 Nf6 5. Bg2 Bg4 6. 0-0 e6 7. c3 Be7 8. Nbd2 0-0 9. Re1 Rc8 10. Qa4 Bxf3 11. Nxf3 Nd7 12. d4 cxd4 13. Nxd4 Nc5 14. Qd1 Ne5 15. Be3 Nc4 16. Bc1 Ne5 17. Be3 1/2-1/2

[Event "Jerry Spann Memorial"]
[Site "Norman"]
[Date "2005.06.18"]
[Round "3"]
[White "Carbonell, Ross"]
[Black "Claassen, Chris"]
[Result "0-1"]
[ECO "B90"]
[PlyCount "54"]
[EventDate "2005.06.18"]
[EventType "swiss"]
[EventRounds "5"]
[EventCountry "USA"]
[SourceTitle "CBM 106 Extra"]
[Source "ChessBase"]
[SourceDate "2005.07.01"]
[SourceVersion "1"]
[SourceVersionDate "2005.07.01"]
[SourceQuality "1"]

1. e4 c5 2. Nf3 d6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 a6 6. f3 e5 7. Nb3 Be6 8. Be3 Nbd7 9. Qd2 b5 10. a4 b4 11. Nd5 a5 12. Bb5 Nxd5 13. exd5 Bf5 14. Rc1 Be7 15. c3 0-0 16. cxb4 axb4 17. 0-0 Nb6 18. a5 Nd7 19. Qxb4 Rb8 20. Qc4 Bg5 21. Bxg5 Qxg5 22. Ba4 Nc5 23. Nxc5 Rxb2 24. Bc2 Rc8 25. Qa4 Bh3 26. g3 Qe3+ 27. Kh1 Qe2 0-1

[Event "Jerry Spann Memorial"]
[Site "Norman"]
[Date "2005.06.18"]
[Round "1"]
[White "Claassen, Chris"]
[Black "Harper, Warren"]
[Result "0-1"]
[ECO "E59"]
[PlyCount "88"]
[EventDate "2005.06.18"]
[EventType "swiss"]
[EventRounds "5"]
[EventCountry "USA"]
[SourceTitle "CBM 106 Extra"]
[Source "ChessBase"]
[SourceDate "2005.07.01"]
[SourceVersion "1"]
[SourceVersionDate "2005.07.01"]
[SourceQuality "1"]

1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. e3 0-0 5. Bd3 c5 6. Nf3 d5 7. 0-0 Nc6 8. a3 Bxc3 9. bxc3 dxc4 10. Bxc4 Qc7 11. Bd3 e5 12. d5 e4 13. dxc6 Rd8 14. Ne1 exd3 15. c4 Qxc6 16. Bd2 Be6 17. Qb3 Qa6 18. Rc1 Ne4 19. Nf3 Nd6 20. Qc3 Nxc4 21. Ne5 Nxd2 22. Qxd2 f6 23. Nf3 Rac8 24. Qc3 b5 25. Rfd1 Qd6 26. Nd2 c4 27. h3 Bd5 28. Nf1 Qb6 29. Ng3 a5 30. Rb1 Rb8 31. Nf5 g6 32. Nh6+ Kg7 33. Ng4 Rd6 34. e4 Bxe4 35. Qd2 f5 36. Qh6+ Kg8 37. Ne5 Qd4 38. Nxc4 Qxc4 39. Rbc1 Qf7 40. Qf4 Rbd8 41. Rc5 d2 42. f3 Bb7 43. Rxb5 Ba6 44. Re5 Qb3 0-1

[Event "North American op 24th"]
[Site "Stillwater"]
[Date "2005.05.28"]
[Round "3"]
[White "Claassen, Chris"]
[Black "Mc Entee, Tim R"]
[Result "1/2-1/2"]
[ECO "D43"]
[BlackElo "2175"]
[PlyCount "140"]
[EventDate "2005.05.27"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "USA"]
[SourceTitle "CBM 106 Extra"]
[Source "ChessBase"]
[SourceDate "2005.07.01"]
[SourceVersion "1"]
[SourceVersionDate "2005.07.01"]
[SourceQuality "1"]

1. d4 d5 2. c4 c6 3. Nc3 Nf6 4. Nf3 e6 5. Bg5 h6 6. Bh4 dxc4 7. a4 Bb4 8. Qc2 Nbd7 9. e3 Qa5 10. Bxf6 Nxf6 11. Bxc4 0-0 12. 0-0 c5 13. Rfd1 cxd4 14. exd4 Bxc3 15. Qxc3 Qxc3 16. bxc3 Bd7 17. Bb3 Rac8 18. Rac1 Rc7 19. Rc2 Rfc8 20. c4 Rc6 21. Ne5 Rb6 22. Nxd7 Nxd7 23. Rd3 e5 24. c5 Rb4 25. dxe5 Nxe5 26. Re3 Rd8 27. h3 Nc6 28. Rc4 a5 29. Rxb4 axb4 30. Bc4 Kf8 31. Kf1 Na5 32. Bb5 b3 33. Re1 b2 34. Ke2 Nb3 35. Rb1 Rd2+ 36. Ke3 Rc2 37. Bd3 Rc3 38. Rxb2 Nxc5 39. Kd4 Nxa4 40. Ra2 Rb3 41. Rxa4 Rb2 42. Ke3 Ke7 43. Ra1 Rb6 44. Rb1 Re6+ 45. Kd2 Rf6 46. Rxb7+ Kf8 47. Ke2 g5 48. Rb5 Kg7 49. Rf5 Rb6 50. Bc4 f6 51. Rb5 Rc6 52. Bd3 h5 53. Rb7+ Kg8 54. Bg6 h4 55. Kf3 Rd6 56. g3 Rd4 57. Rf7 hxg3 58. fxg3 Rd6 59. Kg4 Ra6 60. h4 gxh4 61. gxh4 Rc6 62. h5 Rc1 63. h6 Rg1+ 64. Kf5 Rf1+ 65. Ke6 Re1+ 66. Kd7 Rd1+ 67. Ke8 Re1+ 68. Re7 Rxe7+ 69. Kxe7 f5 70. Bxf5 Kh8 1/2-1/2

[Event "Tulsa April op"]
[Site "Tulsa"]
[Date "2005.04.17"]
[Round "5"]
[White "Berry, Frank Kimball"]
[Black "Claassen, Chris"]
[Result "0-1"]
[ECO "B20"]
[WhiteElo "2033"]
[PlyCount "25"]
[EventDate "2005.04.16"]
[EventType "swiss"]
[EventRounds "5"]
[EventCountry "USA"]
[SourceTitle "CBM 105 Extra"]
[Source "ChessBase"]
[SourceDate "2005.05.01"]
[SourceVersion "1"]
[SourceVersionDate "2005.05.01"]
[SourceQuality "1"]

1. e4 c5 2. b3 d6 3. Bb2 Nc6 4. Nc3 Nf6 5. f4 e6 6. Nf3 a6 7. a4 Be7 8. Be2 0-0 9. 0-0 Qc7 10. d4 cxd4 11. Na2 Nxe4 12. Bxd4 Nxd4 13. Qxd4 0-1

[Event "Tulsa April op"]
[Site "Tulsa"]
[Date "2005.04.17"]
[Round "4"]
[White "Claassen, Chris"]
[Black "Ellis, James S"]
[Result "1-0"]
[ECO "E41"]
[BlackElo "2119"]
[PlyCount "37"]
[EventDate "2005.04.16"]
[EventType "swiss"]
[EventRounds "5"]
[EventCountry "USA"]
[SourceTitle "CBM 105 Extra"]
[Source "ChessBase"]
[SourceDate "2005.05.01"]
[SourceVersion "1"]
[SourceVersionDate "2005.05.01"]
[SourceQuality "1"]

1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. e3 c5 5. Bd3 Nc6 6. Nf3 Bxc3+ 7. bxc3 d6 8. 0-0 e5 9. d5 Ne7 10. e4 h6 11. h3 0-0 12. Ne1 g5 13. h4 Bg4 14. f3 Bd7 15. hxg5 hxg5 16. Bxg5 Nh7 17. Bh6 Re8 18. f4 Ng6 19. f5 1-0

[Event "Tulsa April op"]
[Site "Tulsa"]
[Date "2005.04.16"]
[Round "2"]
[White "Claassen, Chris"]
[Black "Snap, Charles"]
[Result "1/2-1/2"]
[ECO "D85"]
[PlyCount "84"]
[EventDate "2005.04.16"]
[EventType "swiss"]
[EventRounds "5"]
[EventCountry "USA"]
[SourceTitle "CBM 105 Extra"]
[Source "ChessBase"]
[SourceDate "2005.05.01"]
[SourceVersion "1"]
[SourceVersionDate "2005.05.01"]
[SourceQuality "1"]

1. d4 Nf6 2. c4 g6 3. Nc3 d5 4. cxd5 Nxd5 5. e4 Nb6 6. f4 Bg7 7. Nf3 Bg4 8. d5 0-0 9. Be2 c6 10. h3 Bc8 11. 0-0 cxd5 12. Nxd5 Nxd5 13. exd5 Qb6+ 14. Kh1 Rd8 15. Qe1 e6 16. dxe6 Bxe6 17. Qh4 Nd7 18. Ng5 Nf6 19. Nxe6 Qxe6 20. Bf3 Rab8 21. Re1 Qc4 22. Be3 b6 23. a3 Nd5 24. Rac1 Qb3 25. Bxd5 Rxd5 26. Qe7 Qxb2 27. Rc7 Rf8 28. Rxa7 Qc3 29. Bxb6 Qb2 30. Ba5 Bf6 31. Qb7 Qxb7 32. Rxb7 Rxa5 33. Rb6 Bg7 34. Rb3 Rfa8 35. Ree3 Bf8 36. g4 Rxa3 37. Kg2 Rxb3 38. Rxb3 Ra2+ 39. Kg3 f5 40. gxf5 gxf5 41. Rb5 Ra3+ 42. Kg2 Ra2+ 1/2-1/2

[Event "Tulsa April op"]
[Site "Tulsa"]
[Date "2005.04.16"]
[Round "1"]
[White "Movsisyan, Movses"]
[Black "Claassen, Chris"]
[Result "1-0"]
[ECO "B52"]
[WhiteElo "2300"]
[PlyCount "89"]
[EventDate "2005.04.16"]
[EventType "swiss"]
[EventRounds "5"]
[EventCountry "USA"]
[SourceTitle "CBM 105 Extra"]
[Source "ChessBase"]
[SourceDate "2005.05.01"]
[SourceVersion "1"]
[SourceVersionDate "2005.05.01"]
[SourceQuality "1"]

1. e4 c5 2. Nf3 d6 3. Bb5+ Bd7 4. Bxd7+ Nxd7 5. 0-0 Ngf6 6. Re1 e6 7. c3 Be7 8. d4 cxd4 9. cxd4 0-0 10. Nc3 e5 11. Bg5 exd4 12. Qxd4 h6 13. Bxf6 Nxf6 14. Rad1 Re8 15. Nd2 Qd7 16. Nc4 Red8 17. a4 Rac8 18. b3 b6 19. e5 Ne8 20. exd6 Bf6 21. Qd3 Bxc3 22. Qxc3 Nxd6 23. Qg3 Rc6 24. Ne5 Qc7 25. Nxc6 Qxc6 26. Re3 Nb7 27. Rxd8+ Nxd8 28. h4 Kh7 29. Rc3 Qf6 30. Qd3+ g6 31. h5 Ne6 32. hxg6+ fxg6 33. Qd7+ Ng7 34. Rf3 Qa1+ 35. Kh2 Qe5+ 36. g3 h5 37. Rf7 Kh6 38. Qe7 Qb2 39. Qf6 Qxf6 40. Rxf6 Nf5 41. Rf7 Nd4 42. b4 b5 43. Rxa7 Nc6 44. Ra6 Nxb4 45. axb5 1-0

[Event "Tulsa April op"]
[Site "Tulsa"]
[Date "2005.04.16"]
[Round "3"]
[White "Whitcomb, Bran"]
[Black "Claassen, Chris"]
[Result "0-1"]
[ECO "B52"]
[PlyCount "108"]
[EventDate "2005.04.16"]
[EventType "swiss"]
[EventRounds "5"]
[EventCountry "USA"]
[SourceTitle "CBM 105 Extra"]
[Source "ChessBase"]
[SourceDate "2005.05.01"]
[SourceVersion "1"]
[SourceVersionDate "2005.05.01"]
[SourceQuality "1"]

1. e4 c5 2. Nf3 d6 3. d4 cxd4 4. Qxd4 e5 5. Bb5+ Bd7 6. Bxd7+ Nxd7 7. Qd3 Ngf6 8. Nc3 Be7 9. Bg5 a6 10. Rd1 0-0 11. 0-0 Rc8 12. Rd2 h6 13. Bxf6 Nxf6 14. Rfd1 Qb6 15. b3 Rfd8 16. Nh4 Qb4 17. Nb1 Qxe4 18. Qxe4 Nxe4 19. Nf5 Bf8 20. Re2 Nc3 21. Nxc3 Rxc3 22. Red2 b5 23. Ne3 Rdc8 24. Rc1 R3c6 25. Nd5 a5 26. c3 f6 27. Rdc2 Kf7 28. c4 Be7 29. Rc3 bxc4 30. Rxc4 Rxc4 31. Rxc4 Rxc4 32. bxc4 f5 33. Kf1 Ke6 34. Ke2 Bg5 35. Kd1 e4 36. Ke2 Ke5 37. f3 Kd4 38. f4 Bd8 39. Kd2 g5 40. g3 gxf4 41. gxf4 Kxc4 42. Ne3+ Kc5 43. Nxf5 d5 44. Nxh6 Kc4 45. Ng4 d4 46. f5 Bg5+ 47. Kd1 d3 48. f6 e3 49. f7 e2+ 50. Ke1 Bh4+ 51. Nf2 Be7 52. Ne4 Kd4 53. a3 Kxe4 54. Kd2 Bg5+ 0-1

[Event "Stillwater Winter op"]
[Site "Stillwater"]
[Date "2005.02.20"]
[Round "4"]
[White "Claassen, Chris"]
[Black "Dennison, Jerry"]
[Result "1/2-1/2"]
[ECO "E24"]
[PlyCount "75"]
[EventDate "2005.02.19"]
[EventType "swiss"]
[EventRounds "7"]
[EventCountry "USA"]
[SourceTitle "CBM 104 Extra"]
[Source "ChessBase"]
[SourceDate "2005.03.01"]
[SourceVersion "1"]
[SourceVersionDate "2005.03.01"]
[SourceQuality "1"]

1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. a3 Bxc3+ 5. bxc3 h6 6. Nf3 0-0 7. e3 b6 8. Bd3 Bb7 9. 0-0 d6 10. Qe2 Nbd7 11. e4 Re8 12. Re1 c5 13. Qc2 a6 14. Rb1 Rc8 15. d5 exd5 16. exd5 Rxe1+ 17. Nxe1 Ne5 18. Bf4 Nxd3 19. Nxd3 Nh5 20. Be3 b5 21. a4 Qd7 22. cxb5 axb5 23. axb5 Bxd5 24. c4 Be4 25. f3 Bb7 26. Qd2 Qe6 27. Rc1 Re8 28. Bf4 Qg6 29. Kf1 Qf6 30. Qc3 Qxc3 31. Rxc3 Nxf4 32. Nxf4 g5 33. Nh5 Re6 34. Rd3 f5 35. Ng3 Rf6 36. Nh5 Re6 37. Ng3 Rf6 38. Nh5 1/2-1/2

[Event "Stillwater Winter op"]
[Site "Stillwater"]
[Date "2005.02.20"]
[Round "3"]
[White "Latino, Carl D"]
[Black "Claassen, Chris"]
[Result "1-0"]
[ECO "A45"]
[PlyCount "29"]
[EventDate "2005.02.19"]
[EventType "swiss"]
[EventRounds "7"]
[EventCountry "USA"]
[SourceTitle "CBM 104 Extra"]
[Source "ChessBase"]
[SourceDate "2005.03.01"]
[SourceVersion "1"]
[SourceVersionDate "2005.03.01"]
[SourceQuality "1"]

1. d4 Nf6 2. Bg5 Ne4 3. Bh4 d5 4. Nc3 Nxc3 5. bxc3 Nd7 6. Nf3 c6 7. e3 Qa5 8. Bd3 Qxc3+ 9. Nd2 e5 10. 0-0 e4 11. Be2 Bd6 12. Nb3 Qb4 13. f3 0-0 14. Be1 Qb6 15. Ba5 1-0

[Event "Stillwater Winter op"]
[Site "Stillwater"]
[Date "2005.02.19"]
[Round "1"]
[White "Wharry, Stephen M"]
[Black "Claassen, Chris"]
[Result "1-0"]
[ECO "B99"]
[PlyCount "85"]
[EventDate "2005.02.19"]
[EventType "swiss"]
[EventRounds "7"]
[EventCountry "USA"]
[SourceTitle "CBM 104 Extra"]
[Source "ChessBase"]
[SourceDate "2005.03.01"]
[SourceVersion "1"]
[SourceVersionDate "2005.03.01"]
[SourceQuality "1"]

1. e4 c5 2. Nf3 d6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 a6 6. Bg5 e6 7. f4 Be7 8. Qf3 Qc7 9. 0-0-0 Nbd7 10. g4 b5 11. a3 Bb7 12. Bxf6 Nxf6 13. g5 Nd7 14. h4 g6 15. h5 e5 16. hxg6 exd4 17. gxf7+ Kxf7 18. Qh5+ Kg7 19. Qh6+ Kf7 20. Qh5+ Kg7 21. Rxd4 Qc5 22. Qh6+ Kf7 23. Be2 Nf8 24. Rhd1 Ke8 25. Qg7 Ne6 26. Bh5+ Kd8 27. Rxd6+ Bxd6 28. Qxh8+ Kc7 29. Qxh7+ Kb6 30. e5 Bc7 31. f5 Qe3+ 32. Kb1 Nxg5 33. Qg6+ Ka7 34. e6 Rd8 35. Qg7 Rxd1+ 36. Nxd1 Nxe6 37. fxe6 Qxe6 38. Qxc7 Qd5 39. Bg4 Qd4 40. Bf3 Qb6 41. Qxb7+ Qxb7 42. Bxb7 Kxb7 43. b3 1-0

[Event "North American op 23rd"]
[Site "Oklahoma"]
[Date "2004.09.06"]
[Round "8"]
[White "Claassen, Chris"]
[Black "Fortman, Zeb II"]
[Result "1/2-1/2"]
[ECO "D18"]
[BlackElo "1920"]
[PlyCount "78"]
[EventDate "2004.09.03"]
[EventType "swiss"]
[EventRounds "8"]
[EventCountry "USA"]
[SourceTitle "CBM 102 Extra"]
[Source "ChessBase"]
[SourceDate "2004.11.03"]
[SourceVersion "1"]
[SourceVersionDate "2004.11.03"]
[SourceQuality "1"]

1. d4 d5 2. c4 c6 3. Nc3 Nf6 4. Nf3 dxc4 5. a4 Bf5 6. e3 e6 7. Bxc4 Bb4 8. 0-0 0-0 9. h3 h6 10. Qb3 Qe7 11. Ne2 a5 12. Nf4 Na6 13. Nd3 Bd6 14. Bd2 Nb4 15. Nxb4 axb4 16. Bd3 Ne4 17. Qc2 Nxd2 18. Nxd2 Bxd3 19. Qxd3 Rfd8 20. Qc2 e5 21. dxe5 Bxe5 22. Nc4 Bc7 23. b3 b5 24. axb5 cxb5 25. Rxa8 Rxa8 26. Nd2 Qe5 27. Nf3 Qc3 28. Qe4 Rc8 29. Nd4 Bb6 30. Nxb5 Qxb3 31. Rb1 Qc2 32. Qxc2 Rxc2 33. Rxb4 Bc7 34. Nxc7 Rxc7 35. Kh2 h5 36. g4 hxg4 37. hxg4 g6 38. Kg3 Kg7 39. f4 Rc1 1/2-1/2

[Event "North American op 23rd"]
[Site "Oklahoma"]
[Date "2004.09.05"]
[Round "6"]
[White "Claassen, Chris"]
[Black "Fortman, Zeb III"]
[Result "0-1"]
[ECO "D52"]
[PlyCount "102"]
[EventDate "2004.09.03"]
[EventType "swiss"]
[EventRounds "8"]
[EventCountry "USA"]
[SourceTitle "CBM 102 Extra"]
[Source "ChessBase"]
[SourceDate "2004.11.03"]
[SourceVersion "1"]
[SourceVersionDate "2004.11.03"]
[SourceQuality "1"]

1. d4 d5 2. c4 e6 3. Nc3 Nf6 4. Bg5 Nbd7 5. Nf3 c6 6. e3 Qa5 7. Nd2 dxc4 8. Bxf6 Nxf6 9. Nxc4 Qc7 10. Bd3 Be7 11. 0-0 0-0 12. Rc1 Rd8 13. Ne5 Bd7 14. Qe2 Be8 15. Rfd1 Rac8 16. Bb1 c5 17. Nf3 Qb8 18. dxc5 Rxc5 19. Rxd8 Qxd8 20. Rd1 Qc7 21. Qd3 Qd7 22. Qxd7 Bxd7 23. h3 Rc8 24. Ne5 Be8 25. Bd3 a6 26. a3 Bxa3 27. bxa3 Rxc3 28. Ra1 Ba4 29. Kf1 Nd5 30. Be4 f6 31. Nf3 b5 32. Ke2 Bc2 33. Bxc2 Rxc2+ 34. Ke1 e5 35. Rd1 Nb6 36. Rd6 Nc4 37. Rxa6 Ra2 38. Ra8+ Kf7 39. Rb8 Nxa3 40. Nd2 Rb2 41. Kd1 Nb1 42. Nxb1 Rxb1+ 43. Kc2 Rf1 44. Rxb5 Rxf2+ 45. Kd3 Rxg2 46. Rb4 Rg3 47. h4 h5 48. Ke2 Rg4 49. Rxg4 hxg4 50. Kf2 f5 51. Kg3 Kg6 0-1

[Event "North American op 23rd"]
[Site "Oklahoma"]
[Date "2004.09.04"]
[Round "3"]
[White "Gossell, Thomas"]
[Black "Claassen, Chris"]
[Result "1-0"]
[ECO "A55"]
[WhiteElo "2109"]
[PlyCount "49"]
[EventDate "2004.09.03"]
[EventType "swiss"]
[EventRounds "8"]
[EventCountry "USA"]
[SourceTitle "CBM 102 Extra"]
[Source "ChessBase"]
[SourceDate "2004.11.03"]
[SourceVersion "1"]
[SourceVersionDate "2004.11.03"]
[SourceQuality "1"]

1. c4 e5 2. Nc3 Nf6 3. Nf3 d6 4. d4 exd4 5. Nxd4 Be7 6. e4 0-0 7. Be2 Nbd7 8. 0-0 Nc5 9. f3 Ne6 10. Be3 Nxd4 11. Qxd4 Be6 12. Rac1 Nd7 13. Kh1 Kh8 14. Nd5 f5 15. Rfe1 fxe4 16. Qxe4 Bxd5 17. cxd5 Nf6 18. Qc4 Ne8 19. Bd3 Qd7 20. Qe4 Nf6 21. Qh4 h6 22. Bxh6 gxh6 23. Qxh6+ Kg8 24. Qg6+ Kh8 25. Rc4 1-0

[Event "US op U18"]
[Site "Lindsborg"]
[Date "2004.07.24"]
[Round "2"]
[White "Claassen, Chris"]
[Black "Arrington, Rachael"]
[Result "1/2-1/2"]
[ECO "D53"]
[WhiteElo "1102"]
[BlackElo "1850"]
[PlyCount "142"]
[EventDate "2004.07.??"]
[EventType "swiss"]
[EventRounds "6"]
[EventCountry "USA"]
[EventCategory "1"]
[SourceTitle "EXT 2006"]
[Source "ChessBase"]
[SourceDate "2005.11.24"]
[SourceVersion "1"]
[SourceVersionDate "2005.11.24"]
[SourceQuality "1"]

1. d4 d5 2. c4 c6 3. Nc3 e6 4. Nf3 Nf6 5. Bg5 Nbd7 6. e3 Be7 7. Bd3 dxc4 8. Bxc4 b5 9. Bb3 a6 10. 0-0 0-0 11. a3 Bb7 12. Rc1 c5 13. Qe2 Qb6 14. Ne5 Rfe8 15. dxc5 Nxc5 16. Bc2 h6 17. Bh4 Nd5 18. Nxd5 Bxd5 19. Qh5 Be4 20. Qxf7+ Kh8 21. Ng6+ Bxg6 22. Qxg6 Kg8 23. Qh7+ Kf8 24. Qh8+ Kf7 25. Qh7 Bxh4 26. Bg6+ Ke7 27. Qxg7+ Kd8 28. Rfd1+ Kc8 29. Rxc5+ Qxc5 30. Qd7+ Kb8 31. Qxe8+ Ka7 32. Qd7+ Kb8 33. Be4 Ra7 34. Qe8+ Qc8 35. Qh5 Bg5 36. f4 Be7 37. Qe5+ Rc7 38. f5 exf5 39. Bxf5 Qf8 40. Rd7 Bd8 41. Qd6 Qxf5 42. Rxd8+ Kb7 43. Qd5+ Qxd5 44. Rxd5 Rc1+ 45. Kf2 Rc2+ 46. Kf3 Rxb2 47. Rd3 a5 48. e4 a4 49. e5 b4 50. axb4 Rb3 51. Ke2 Rxb4 52. Ke3 Rb3 53. Kd4 Rxd3+ 54. Kxd3 a3 55. Kc2 a2 56. Kb2 a1Q+ 57. Kxa1 Kc6 58. e6 Kd6 59. e7 Kxe7 60. Kb2 Kf6 61. Kc2 Ke5 62. Kd2 Kd4 63. Ke2 Ke4 64. Kf2 Kf4 65. g3+ Kg4 66. Kg2 h5 67. h3+ Kg5 68. Kf3 Kf5 69. h4 Kg6 70. Kf4 Kf6 71. Ke4 Ke6 1/2-1/2

[Event "US op U18"]
[Site "Lindsborg"]
[Date "2004.07.24"]
[Round "3"]
[White "Claassen, Chris"]
[Black "Datta, Deepyaman"]
[Result "0-1"]
[ECO "A57"]
[WhiteElo "1102"]
[BlackElo "2032"]
[PlyCount "74"]
[EventDate "2004.07.??"]
[EventType "swiss"]
[EventRounds "6"]
[EventCountry "USA"]
[EventCategory "1"]
[SourceTitle "EXT 2006"]
[Source "ChessBase"]
[SourceDate "2005.11.24"]
[SourceVersion "1"]
[SourceVersionDate "2005.11.24"]
[SourceQuality "1"]

1. d4 Nf6 2. c4 c5 3. d5 b5 4. Nc3 b4 5. Nb1 e6 6. g3 exd5 7. cxd5 d6 8. Bg2 Nbd7 9. e4 Qe7 10. Qe2 a5 11. Qc2 Nxd5 12. Ne2 N5b6 13. e5 d5 14. f4 g6 15. 0-0 Bg7 16. a3 Ba6 17. axb4 axb4 18. Rd1 Qe6 19. Be3 0-0 20. Ra5 Nc4 21. Bxd5 Nxe3 22. Bxe6 Nxc2 23. Bxd7 Bxe2 24. Rxa8 Rxa8 25. Rc1 Bd3 26. Nd2 Bf8 27. Nf3 Ra2 28. e6 c4 29. Ne5 Bc5+ 30. Kg2 Be4+ 31. Kh3 fxe6 32. Bxe6+ Kg7 33. Nxc4 Ra6 34. Bc8 Ra8 35. Bg4 h5 36. Bd1 Ne1 37. g4 Nd3 0-1

