[Event "NED-ch U12"]
[Site "Hengelo"]
[Date "2000.08.09"]
[Round "7"]
[White "Klaassen, Mark"]
[Black "Jacobs, Florian"]
[Result "0-1"]
[ECO "C02"]
[PlyCount "78"]
[EventDate "2000.08.07"]
[EventType "swiss"]
[EventRounds "13"]
[EventCountry "NED"]
[SourceTitle "EXT 2001"]
[Source "ChessBase"]
[SourceDate "2000.11.22"]
[SourceVersion "1"]
[SourceVersionDate "2000.11.22"]
[SourceQuality "1"]

1. e4 e6 2. Nf3 d5 3. e5 c5 4. d4 Nc6 5. Be3 Qb6 6. b3 cxd4 7. Bxd4 Nxd4 8. Nxd4 Bc5 9. c3 Bd7 10. Be2 Ne7 11. Qd2 Bxd4 12. Qxd4 Qxd4 13. cxd4 Nf5 14. 0-0 Nxd4 15. Bd3 Nc6 16. f4 Nb4 17. Rf3 Nxd3 18. Rxd3 Bb5 19. Rc3 Kd7 20. Nd2 Rhc8 21. Rac1 d4 22. R3c2 Rxc2 23. Rxc2 Rc8 24. Rxc8 Kxc8 25. Ne4 Kc7 26. Kf2 Bd3 27. Nd2 Kc6 28. Ke1 Kd5 29. Nf3 Bg6 30. Kd2 Ke4 31. Ne1 Kxf4 32. Nc2 Bxc2 33. Kxc2 Ke3 34. Kd1 Kd3 35. h3 h6 36. g3 g6 37. g4 g5 38. b4 b5 39. a3 a6 0-1

[Event "NED-ch U12"]
[Site "Hengelo"]
[Date "2000.08.07"]
[Round "1"]
[White "Kuipers, Stefan"]
[Black "Klaassen, Mark"]
[Result "1-0"]
[ECO "C45"]
[PlyCount "61"]
[EventDate "2000.08.07"]
[EventType "swiss"]
[EventRounds "13"]
[EventCountry "NED"]
[SourceTitle "EXT 2001"]
[Source "ChessBase"]
[SourceDate "2000.11.22"]
[SourceVersion "1"]
[SourceVersionDate "2000.11.22"]
[SourceQuality "1"]

1. e4 e5 2. Nf3 Nc6 3. d4 exd4 4. Nxd4 Ne5 5. Bf4 f6 6. Nc3 c6 7. Nf3 Nxf3+ 8. Qxf3 Bb4 9. Bd2 Bxc3 10. Bxc3 d5 11. Rd1 Qe7 12. Bd3 Nh6 13. h3 0-0 14. 0-0 Nf7 15. Rfe1 Ne5 16. Qe3 Nxd3 17. Qxd3 Qd6 18. e5 fxe5 19. Rxe5 Bd7 20. Rh5 h6 21. Qd4 Rf6 22. Rxh6 Raf8 23. Rxf6 Rxf6 24. Qxa7 Rg6 25. Rd3 c5 26. Qxb7 Be6 27. Ba5 Qf4 28. Re3 Bxh3 29. Qxd5+ Be6 30. Rxe6 Qc1+ 31. Re1+ 1-0

[Event "NED U12 op"]
[Site "Hengelo"]
[Date "1999.??.??"]
[Round "3"]
[White "Eielts, Charley"]
[Black "Klaassen, Mark"]
[Result "1-0"]
[ECO "A34"]
[PlyCount "71"]
[EventDate "1999.??.??"]
[EventType "swiss"]
[EventRounds "13"]
[EventCountry "NED"]
[SourceTitle "EXT 2000"]
[Source "ChessBase"]
[SourceDate "1999.11.16"]
[SourceVersion "1"]
[SourceVersionDate "1999.11.16"]
[SourceQuality "1"]

1. c4 e5 2. Nc3 c5 3. Nf3 Nc6 4. g3 d6 5. Bg2 Nf6 6. d3 h6 7. 0-0 Be6 8. Nd2 Qc7 9. Nde4 Nxe4 10. Nxe4 Be7 11. Be3 f5 12. Nc3 g5 13. Nb5 Qd7 14. Bd2 a6 15. Nc3 f4 16. Kh1 h5 17. e3 fxg3 18. fxg3 Bh3 19. Qf3 Bxg2+ 20. Qxg2 Nb4 21. Nd5 Nxd3 22. Qf3 Rf8 23. Qxh5+ Kd8 24. Rxf8+ Bxf8 25. Qxg5+ Kc8 26. Nb6+ Kc7 27. Nxd7 Kxd7 28. Qf5+ Kc7 29. Qxd3 Be7 30. Rf1 Kd7 31. Rf7 Ke8 32. Qh7 Kd7 33. Rxe7+ Kc6 34. Rxb7 Rc8 35. Qe4+ d5 36. Qxd5# 1-0

[Event "NED U12 op"]
[Site "Hengelo"]
[Date "1999.??.??"]
[Round "1"]
[White "Klaassen, Mark"]
[Black "Van Splunter, Jacco"]
[Result "1-0"]
[ECO "C48"]
[PlyCount "57"]
[EventDate "1999.??.??"]
[EventType "swiss"]
[EventRounds "13"]
[EventCountry "NED"]
[SourceTitle "EXT 2000"]
[Source "ChessBase"]
[SourceDate "1999.11.16"]
[SourceVersion "1"]
[SourceVersionDate "1999.11.16"]
[SourceQuality "1"]

1. e4 e5 2. Nc3 Nf6 3. Nf3 Nc6 4. Bb5 Bc5 5. Bxc6 bxc6 6. Nxe5 h5 7. d4 Bb6 8. Bg5 c5 9. Na4 cxd4 10. Nxb6 axb6 11. Qxd4 c5 12. Qc4 0-0 13. 0-0 Ba6 14. Qc3 Bxf1 15. Kxf1 Qe8 16. Bxf6 gxf6 17. Qg3+ Kh8 18. Nd3 Qxe4 19. Re1 Qg6 20. Qh3 Rxa2 21. Nf4 Qh6 22. Nd5 Rxb2 23. Qxd7 Rxc2 24. Qe7 Qd2 25. Qxf8+ Kh7 26. Qxf7+ Kh6 27. Qxf6+ Kh7 28. Re7+ Kg8 29. Qg7# 1-0

[Event "Hengelo U12 op"]
[Site "Hengelo"]
[Date "1998.??.??"]
[Round "?"]
[White "Broekmeulen, Jasper"]
[Black "Klaassen, Mark"]
[Result "0-1"]
[ECO "B02"]
[PlyCount "50"]
[EventDate "1998.??.??"]
[EventType "swiss"]
[EventRounds "13"]
[EventCountry "NED"]
[SourceTitle "EXT 2002"]
[Source "ChessBase"]
[SourceDate "2001.11.25"]
[SourceVersion "1"]
[SourceVersionDate "2001.11.25"]
[SourceQuality "1"]

1. e4 d5 2. exd5 Nf6 3. Nc3 Bf5 4. d3 h6 5. Nf3 c6 6. dxc6 Nxc6 7. Be3 e6 8. Be2 Bd6 9. 0-0 Qc7 10. a3 Ng4 11. h3 Nf6 12. Nb5 Qd7 13. Nxd6+ Qxd6 14. c4 Qd7 15. b4 Rg8 16. b5 Ne7 17. a4 g5 18. Ne5 Qd6 19. Nf3 h5 20. Bxg5 Nh7 21. Bxe7 Kxe7 22. d4 Bxh3 23. Re1 Rxg2+ 24. Kh1 Ng5 25. Nxg5 Qh2# 0-1

[Event "Hengelo U12 op"]
[Site "Hengelo"]
[Date "1998.??.??"]
[Round "?"]
[White "Broekmeulen, Jasper"]
[Black "Klaassen, Mark"]
[Result "1-0"]
[ECO "C62"]
[PlyCount "79"]
[EventDate "1998.??.??"]
[EventType "swiss"]
[EventRounds "13"]
[EventCountry "NED"]
[SourceTitle "EXT 2002"]
[Source "ChessBase"]
[SourceDate "2001.11.25"]
[SourceVersion "1"]
[SourceVersionDate "2001.11.25"]
[SourceQuality "1"]

1. e4 e5 2. Nf3 Nc6 3. d4 d6 4. Bb5 Bd7 5. Nc3 a6 6. Bxc6 Bxc6 7. dxe5 dxe5 8. Qxd8+ Rxd8 9. Nxe5 Nf6 10. Nxc6 bxc6 11. 0-0 Bc5 12. Bf4 Rd4 13. Rad1 0-0 14. Bxc7 Rb4 15. a3 Rxb2 16. Na4 Rxc2 17. Nxc5 Rxc5 18. Bd6 Ra5 19. Bxf8 Kxf8 20. Rd3 Nxe4 21. Re1 f5 22. f3 Ng5 23. Rb3 Kf7 24. Rc1 c5 25. Re1 h5 26. h4 Ne6 27. Rb7+ Kf6 28. Rb6 Kg6 29. Rexe6+ Kf7 30. Rxa6 Rb5 31. Rac6 Rb3 32. Red6 Ke7 33. Rd5 Rxa3 34. Rxf5 Kd7 35. Rcxc5 Ra4 36. Rxh5 Ke7 37. Rh7 Ke6 38. Rxg7 Rxh4 39. Rg6+ Kf7 40. Rg4 1-0

[Event "Hengelo U12 op"]
[Site "Hengelo"]
[Date "1998.??.??"]
[Round "?"]
[White "Van de Put, Jeroen"]
[Black "Klaassen, Mark"]
[Result "1-0"]
[ECO "C50"]
[PlyCount "69"]
[EventDate "1998.??.??"]
[EventType "swiss"]
[EventRounds "13"]
[EventCountry "NED"]
[SourceTitle "EXT 2002"]
[Source "ChessBase"]
[SourceDate "2001.11.25"]
[SourceVersion "1"]
[SourceVersionDate "2001.11.25"]
[SourceQuality "1"]

1. e4 e5 2. Nf3 Nc6 3. Bc4 Bc5 4. d3 h6 5. Be3 Bb6 6. Nbd2 d6 7. Qe2 Bg4 8. h3 Bh5 9. g4 Bg6 10. 0-0-0 Nf6 11. Nh4 d5 12. exd5 Nxd5 13. Nf5 Bxf5 14. gxf5 Nce7 15. Qf3 Bxe3 16. fxe3 0-0 17. Rdg1 g6 18. f6 c6 19. fxe7 Qxe7 20. h4 b5 21. Bxd5 cxd5 22. h5 Kh7 23. Qxd5 Rac8 24. hxg6+ fxg6 25. Qe4 Rf5 26. Nf3 Qc5 27. c3 b4 28. c4 Rcf8 29. Nh4 R5f6 30. Nxg6 Kg7 31. Nxf8+ Kxf8 32. Qa8+ Ke7 33. Rg7+ Ke6 34. Qe8+ Kd6 35. Qd7# 1-0

[Event "Hengelo U12 op"]
[Site "Hengelo"]
[Date "1997.??.??"]
[Round "12"]
[White "Klaassen, Mark"]
[Black "Pruijssers, Roeland"]
[Result "0-1"]
[ECO "B80"]
[PlyCount "48"]
[EventDate "1997.??.??"]
[EventType "swiss"]
[EventRounds "13"]
[EventCountry "NED"]
[SourceTitle "EXT 2001"]
[Source "ChessBase"]
[SourceDate "2000.11.22"]
[SourceVersion "1"]
[SourceVersionDate "2000.11.22"]
[SourceQuality "1"]

1. e4 c5 2. Nf3 d6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 e6 6. Bb5+ Nbd7 7. Be3 a6 8. Ba4 b5 9. Bb3 Nc5 10. Nc6 Qc7 11. Nd4 Ncxe4 12. Qf3 Bb7 13. 0-0 Nxc3 14. Qg3 Nce4 15. Qh4 Be7 16. a4 0-0 17. axb5 Nd5 18. Bc1 Bxh4 19. Rd1 Bxf2+ 20. Kh1 Bxd4 21. Rxd4 Nf2+ 22. Kg1 Qc5 23. Rc4 Nh3+ 24. Kf1 Qf2# 0-1

[Event "Hengelo U12 op"]
[Site "Hengelo"]
[Date "1997.??.??"]
[Round "7"]
[White "Sarneel, Job"]
[Black "Klaassen, Mark"]
[Result "0-1"]
[ECO "C44"]
[PlyCount "60"]
[EventDate "1997.??.??"]
[EventType "swiss"]
[EventRounds "13"]
[EventCountry "NED"]
[SourceTitle "EXT 2001"]
[Source "ChessBase"]
[SourceDate "2000.11.22"]
[SourceVersion "1"]
[SourceVersionDate "2000.11.22"]
[SourceQuality "1"]

1. e4 e5 2. Nf3 Nc6 3. c3 Bc5 4. d4 exd4 5. cxd4 Bb4+ 6. Nc3 d6 7. Bd3 h6 8. 0-0 Nf6 9. Bf4 Bg4 10. Be2 Nh5 11. Qc1 Nxf4 12. Qxf4 Be6 13. d5 Nd4 14. Nxd4 Bd7 15. Bh5 0-0 16. Rae1 Qe7 17. a3 Bc5 18. Nf3 c6 19. e5 cxd5 20. Nxd5 Qd8 21. exd6 Bb5 22. Re7 Bxf1 23. Kxf1 Bxd6 24. Bxf7+ Kh8 25. Qe4 Bxe7 26. Qf5 Qc8 27. Qg6 Qc1+ 28. Ke2 Qxb2+ 29. Kd3 Qb1+ 30. Ke3 Qxg6 0-1

[Event "Hengelo U12 op"]
[Site "Hengelo"]
[Date "1997.??.??"]
[Round "9"]
[White "Van Rhijn, Arnoldus"]
[Black "Klaassen, Mark"]
[Result "0-1"]
[ECO "C55"]
[PlyCount "28"]
[EventDate "1997.??.??"]
[EventType "swiss"]
[EventRounds "13"]
[EventCountry "NED"]
[SourceTitle "EXT 2001"]
[Source "ChessBase"]
[SourceDate "2000.11.22"]
[SourceVersion "1"]
[SourceVersionDate "2000.11.22"]
[SourceQuality "1"]

1. e4 e5 2. Nf3 Nc6 3. Bc4 Bc5 4. 0-0 Nf6 5. Nc3 d6 6. Ng5 0-0 7. Re1 h6 8. Bxf7+ Rxf7 9. Nxf7 Kxf7 10. Qf3 Nd4 11. Qd3 Ng4 12. Qc4+ Be6 13. Qd3 Qh4 14. g3 Qxh2+ 0-1

[Event "Hengelo U12 op"]
[Site "Hengelo"]
[Date "1997.??.??"]
[Round "13"]
[White "Zomer, Anoek"]
[Black "Klaassen, Mark"]
[Result "1-0"]
[ECO "C50"]
[PlyCount "69"]
[EventDate "1997.??.??"]
[EventType "swiss"]
[EventRounds "13"]
[EventCountry "NED"]
[SourceTitle "EXT 2001"]
[Source "ChessBase"]
[SourceDate "2000.11.22"]
[SourceVersion "1"]
[SourceVersionDate "2000.11.22"]
[SourceQuality "1"]

1. e4 e5 2. Nf3 Nc6 3. Nc3 Bc5 4. Bc4 d6 5. h3 Nf6 6. 0-0 Nh5 7. d3 h6 8. Nxe5 dxe5 9. Qxh5 Qf6 10. Be3 Bb6 11. Nd5 Qg6 12. Qxg6 fxg6 13. Bxb6 axb6 14. Nxc7+ Kd8 15. Nxa8 Rf8 16. Nxb6 g5 17. Nxc8 Kxc8 18. c3 Rf6 19. Rad1 Rg6 20. f3 h5 21. g4 hxg4 22. fxg4 Rh6 23. Kg2 Ne7 24. d4 Ng6 25. Kg3 Nf4 26. Rh1 exd4 27. Rxd4 Ne2+ 28. Bxe2 Rb6 29. b3 Rc6 30. Rc4 Rxc4 31. bxc4 Kc7 32. Rd1 b5 33. e5 b4 34. cxb4 g6 35. e6 1-0

