| ECO A15 in 1991 play it! weyerstrass defeats black's singelenberg in 103 moves | 1. c4 Nf6 2. g3 c6 3. Bg2 d5 4. Nf3 e6 5. b3 Be7 6. Bb2 O-O 7. O-O Nbd7 8. d3 Re8 9. Nbd2 b6 10. Qc2 Bb7 11. e4 Nf8 12. Rfd1 c5 13. exd5 exd5 14. d4 Qc7 15. cxd5 Bxd5 16. Rac1 Qb7 17. Nh4 Bxg2 18. Nxg2 Rac8 19. Qf5 cxd4 20. Bxd4 Ne6 21. Bb2 Red8 22. Nc4 Qe4 23. Nge3 g6 24. Qxe4 Nxe4 25. f3 Nf6 26. Kg2 Nc7 27. Bxf6 Rxd1 28. Rxd1 Bxf6 29. Rd7 Nb5 30. Nd5 Kg7 31. a4 Nc3 32. Nxf6 Kxf6 33. Rxa7 b5 34. Nd6 Rb8 35. Ra6 Ke7 36. a5 b4 37. Nc4 Nb5 38. Rb6 Rxb6 39. Nxb6 Kd6 40. Nc4+ Kc7 41. Ne3 Nd4 42. Nd5+ Kc6 43. Nxb4+ Kc5 44. Nd3+ Kb5 45. b4 Kc4 46. a6 Nb5 47. Ne5+ Kxb4 48. Nxf7 Ka5 49. Ng5 h5 50. Ne6 Kxa6 51. Nf4 g5 52. Nxh5 |
| ECO A10 in 1988 play it! weyerstrass defeats black's kos j in 55 moves | 1. c4 g6 2. g3 Bg7 3. Bg2 Nf6 4. Nc3 O-O 5. e4 d6 6. Nge2 c5 7. O-O Nc6 8. d3 Ne8 9. Be3 Nd4 10. Rb1 Nc7 11. b4 Nce6 12. h3 a6 13. f4 b5 14. bxc5 dxc5 15. e5 Rb8 16. Ne4 bxc4 17. Rxb8 cxd3 18. Nxd4 Nxd4 19. Nxc5 Qc7 20. Rxc8 Qxc8 21. Bxd4 Rd8 22. Nb3 f6 23. exf6 exf6 24. Qxd3 f5 25. Qe3 Re8 26. Bd5+ Kh8 27. Bxg7+ Kxg7 28. Qd4+ |
| ECO A11 in 1981 play it! weyerstrass defeats black's dijk in 67 moves | 1. c4 c6 2. Nc3 d5 3. cxd5 cxd5 4. d4 Nc6 5. Bf4 a6 6. e3 e6 7. Rc1 Bd6 8. Bg3 Nf6 9. Bd3 Bxg3 10. hxg3 Qb6 11. Qe2 Nb4 12. Bb1 Bd7 13. Nf3 Rc8 14. Ne5 Bb5 15. Qd2 O-O 16. a3 Nc6 17. Nxb5 Qxb5 18. Nd7 h6 19. Bd3 Qa5 20. Nxf8 Qxd2+ 21. Kxd2 Kxf8 22. Rc2 Ke7 23. Rhc1 Kd6 24. b4 g6 25. f3 h5 26. b5 axb5 27. Bxb5 Nd7 28. a4 Ndb8 29. a5 Rc7 30. e4 dxe4 31. fxe4 Re7 32. a6 Na7 33. e5+ Kd5 34. Rc5+ |
| ECO A10 in 1986 play it! weyerstrass defeats black's kos j in 73 moves | 1. c4 g6 2. g3 Bg7 3. Bg2 c5 4. Nc3 Nc6 5. d3 d6 6. e4 e6 7. Nge2 Nge7 8. O-O O-O 9. Rb1 b6 10. a3 Bb7 11. b4 Qd7 12. Qa4 Ne5 13. Qxd7 Nxd7 14. Be3 Ne5 15. bxc5 dxc5 16. Bxc5 Rfe8 17. Rfd1 Rad8 18. Bd4 N7c6 19. Bxe5 Nxe5 20. c5 Ba6 21. d4 Nc4 22. c6 Rc8 23. d5 exd5 24. exd5 Nxa3 25. Rb3 Nc4 26. Bh3 f5 27. Bf1 Na5 28. Rbb1 Nxc6 29. dxc6 Rxc6 30. Rbc1 Kf8 31. Na2 Bxe2 32. Bxe2 Rxe2 33. Rxc6 Rxa2 34. Rd7 Re2 35. Rc8+ Re8 36. Rxe8+ Kxe8 37. Rxg7 |
| ECO A15 in 1975 play it! weyerstrass defeats black's aaldijk in 117 moves | 1. c4 Nf6 2. Nf3 e6 3. Nc3 c5 4. g3 d5 5. cxd5 exd5 6. d4 Nc6 7. Bg5 Be7 8. Bg2 O-O 9. O-O cxd4 10. Nxd4 h6 11. Bxf6 Bxf6 12. Nxc6 bxc6 13. Rc1 Ba6 14. Na4 Bb5 15. Nc3 Bxc3 16. Rxc3 Re8 17. Re1 Rc8 18. a4 Ba6 19. b4 Qf6 20. Rc5 Qb2 21. b5 cxb5 22. Rxc8 Rxc8 23. axb5 Bxb5 24. Bxd5 Re8 25. e4 Qb4 26. Re3 Bc4 27. Bxc4 Qxc4 28. Qd7 Rb8 29. Qd3 Qxd3 30. Rxd3 Ra8 31. Kf1 a5 32. Ke2 a4 33. Ra3 f6 34. f4 g6 35. Kd3 Rd8+ 36. Kc4 Rd2 37. h4 Re2 38. Kd5 Rd2+ 39. Ke6 Rd4 40. Kxf6 Rxe4 41. Kxg6 Re6+ 42. Kf5 Ra6 43. g4 Ra5+ 44. Kg6 Ra6+ 45. Kh5 Kg7 46. g5 Ra5 47. Kg4 hxg5 48. hxg5 Kg6 49. Rc3 a3 50. f5+ Kg7 51. Rc7+ Kf8 52. Rc8+ Kf7 53. g6+ Kg7 54. Rc7+ Kf6 55. Rf7+ Ke5 56. g7 a2 57. g8=Q a1=Q 58. Qe8+ Kd6 59. Qe6+ |
| ECO A17 in 1976 play it! weyerstrass defeats black's van aurich in 77 moves | 1. c4 Nf6 2. Nc3 e6 3. Nf3 c5 4. g3 Be7 5. Bg2 Nc6 6. O-O O-O 7. d4 cxd4 8. Nxd4 Qb6 9. Nc2 Rd8 10. e4 Ne5 11. b3 d6 12. Qe2 a6 13. h3 Qc7 14. Bb2 Rb8 15. Rac1 b6 16. f4 Ng6 17. g4 Bb7 18. g5 Nd7 19. Ne3 Nc5 20. Ba1 Bf8 21. b4 Nd7 22. Qb2 Rbc8 23. Ne2 a5 24. a3 Qb8 25. Ng4 Qa8 26. Ng3 e5 27. f5 Nf4 28. Rxf4 exf4 29. Nh6+ Kh8 30. Nxf7+ Kg8 31. Nxd8 Rxd8 32. Nh5 Ne5 33. Qe2 f3 34. Bxf3 Nxf3+ 35. Qxf3 Bxe4 36. Qf2 d5 37. f6 axb4 38. f7+ Kh8 39. Qf6 |
| ECO A10 in 1985 play it! weyerstrass defeats black's hendriks in 67 moves | 1. c4 g6 2. g3 Bg7 3. Bg2 Nf6 4. Nc3 d6 5. e4 e5 6. Nge2 O-O 7. O-O Nc6 8. f4 exf4 9. gxf4 Bg4 10. d4 Nxe4 11. Bxe4 Bxd4+ 12. Kh1 Re8 13. Qd3 Bg7 14. Bd2 Nb4 15. Qb1 f5 16. Bf3 Bh3 17. Re1 Qh4 18. Ng3 Bd4 19. Nce2 Bf2 20. Bxb4 Bg4 21. Qd3 Re3 22. Qd5+ Kf8 23. Bxg4 Qxg4 24. Qg2 Bxe1 25. Rxe1 Rae8 26. Bd2 R3e6 27. Qf2 h5 28. Ng1 Rxe1 29. Bxe1 h4 30. N3e2 h3 31. Bd2 Re4 32. b3 Kg7 33. Ng3 Re7 34. Qf1 |
| ECO A20 in 1983 play it! weyerstrass defeats black's van keekem in 59 moves | 1. c4 e5 2. g3 Nc6 3. Bg2 Nf6 4. Nc3 Be7 5. e4 Nd4 6. Nge2 Nxe2 7. Qxe2 c5 8. O-O O-O 9. f4 d6 10. d3 Bg4 11. Qf2 exf4 12. gxf4 Nh5 13. Be3 Bh4 14. Qd2 Qd7 15. f5 Nf6 16. Kh1 Qe7 17. Bg5 Bxg5 18. Qxg5 Qe5 19. Rf2 h6 20. Qh4 Kh7 21. Nd5 Qd4 22. Raf1 Rg8 23. h3 Qxd3 24. Nxf6+ gxf6 25. hxg4 Rg5 26. b3 Kg7 27. Qh3 Qd4 28. Bf3 Qe5 29. Qh2 Rd8 30. Rd1 |
| ECO A13 in 1979 play it! weyerstrass defeats black's haverkamp in 61 moves | 1. c4 e6 2. Nc3 f5 3. g3 Nf6 4. Bg2 c5 5. d3 Nc6 6. e4 Be7 7. Nge2 O-O 8. O-O d6 9. exf5 exf5 10. Nd5 Nxd5 11. Bxd5+ Kh8 12. Re1 Bf6 13. a3 Qc7 14. Rb1 a5 15. Nf4 Bd7 16. Qh5 h6 17. Ng6+ Kh7 18. Nxf8+ Rxf8 19. Bd2 Ne5 20. Qe2 Bc6 21. f4 Ng4 22. Qf3 Bd4+ 23. Kg2 Be8 24. Bc3 Bh5 25. Bxd4 cxd4 26. Kg1 b5 27. h3 Nf6 28. Qg2 bxc4 29. Bxc4 Be8 30. Be6 Nh5 31. Bxf5+ |
| ECO A10 in 1986 play it! weyerstrass defeats black's kos j in 75 moves | 1. c4 g6 2. Nc3 Bg7 3. g3 e5 4. Bg2 Ne7 5. e4 d6 6. Nge2 Be6 7. d4 O-O 8. d5 Bd7 9. Be3 Qc8 10. O-O Bh3 11. Bxh3 Qxh3 12. Nb5 Qd7 13. Bxa7 c6 14. dxc6 bxc6 15. Bxb8 cxb5 16. Bxd6 bxc4 17. Nc3 Rfd8 18. Bxe7 Qxe7 19. Nd5 Qc5 20. Qe2 f5 21. Rfc1 Rac8 22. b4 Qd6 23. Rxc4 fxe4 24. Rxc8 Rxc8 25. Qxe4 Rd8 26. Rd1 Qe6 27. a4 Bf8 28. Kg2 Rb8 29. b5 Kh8 30. Re1 Rd8 31. Qxe5+ Qxe5 32. Rxe5 Bd6 33. Re4 Bxg3 34. hxg3 Rxd5 35. b6 Rd7 36. a5 Rb7 37. Rc4 Kg8 38. Rc8+ |
| ECO A15 in 1982 play it! weyerstrass defeats black's masmeijer in 55 moves | 1. c4 Nf6 2. g3 e5 3. Bg2 d5 4. cxd5 Nxd5 5. Nc3 Nb6 6. d3 Be7 7. Be3 O-O 8. Qc1 c6 9. Nf3 f6 10. O-O Be6 11. Rd1 Nd5 12. d4 Nd7 13. dxe5 Nxe5 14. Nxe5 fxe5 15. Ne4 Qa5 16. Bc5 Qc7 17. Bxe7 Qxe7 18. Qg5 Qc7 19. Nc5 Bf7 20. Rac1 Rad8 21. Bh3 Rfe8 22. Bf5 b6 23. Ne4 Kh8 24. Qh4 Bg8 25. Rd3 Qf7 26. Rf3 g6 27. Ng5 Qg7 28. Be6 |
| ECO A15 in 1988 play it! weyerstrass defeats black's kooyman in 89 moves | 1. c4 Nf6 2. g3 c5 3. Bg2 g6 4. Nc3 Bg7 5. e4 Nc6 6. Nge2 O-O 7. O-O d6 8. d3 Rb8 9. h3 a6 10. a4 Qb6 11. Rb1 Be6 12. Be3 Ne8 13. f4 f5 14. exf5 gxf5 15. Nd5 Bxd5 16. Bxd5+ Kh8 17. Kh2 Nc7 18. Bg2 Ne6 19. Re1 Qc7 20. Nc3 Qd7 21. Qe2 Nc7 22. Bg1 e6 23. Qd2 Qf7 24. Ne2 Qd7 25. d4 cxd4 26. Nxd4 Nxd4 27. Bxd4 b5 28. Bxg7+ Kxg7 29. cxb5 axb5 30. Rbc1 Nd5 31. Qd4+ Rf6 32. a5 Ra8 33. g4 Qa7 34. Qxa7+ Rxa7 35. g5 Rg6 36. Bxd5 exd5 37. b4 Kf7 38. Rcd1 Re6 39. Kg3 Rxe1 40. Rxe1 Rc7 41. Kf3 d4 42. Ra1 Ke6 43. a6 Ra7 44. Ke2 Kd5 45. Kd3 |
| ECO A10 in 1981 play it! weyerstrass defeats black's tolk in 81 moves | 1. c4 b6 2. Nc3 Bb7 3. e4 c5 4. g3 Nc6 5. Bg2 g6 6. Nge2 Bg7 7. O-O e6 8. d3 Nge7 9. Be3 Nd4 10. Bxd4 cxd4 11. Nb5 d5 12. exd5 exd5 13. Nbxd4 O-O 14. Rc1 Qd7 15. c5 Rfc8 16. cxb6 axb6 17. Qb3 Ra4 18. Bh3 f5 19. Rxc8+ Bxc8 20. Nb5 Ra5 21. Nbc3 Qd6 22. Rc1 Ba6 23. Bg2 Be5 24. d4 Bf6 25. a3 Kg7 26. Qb4 Qb8 27. Nf4 Nc6 28. Qb3 Nxd4 29. Qd1 Qe5 30. Bxd5 Rc5 31. Bg2 Kh6 32. h4 Bc4 33. Qe1 Nb3 34. Qxe5 Bxe5 35. Re1 Bxf4 36. gxf4 Nd4 37. Re5 Rc7 38. Kh2 Ne6 39. Kg3 Nc5 40. Nd5 Bxd5 41. Bxd5 |
| ECO A10 in 1987 play it! weyerstrass defeats black's hendriks r in 65 moves | 1. c4 b6 2. Nc3 e6 3. e4 Bb7 4. d3 Bb4 5. Ne2 Ne7 6. g3 O-O 7. Bg2 c5 8. O-O Bxc3 9. Nxc3 e5 10. f4 d6 11. Rb1 Nbc6 12. f5 f6 13. g4 g5 14. Be3 Kf7 15. Kf2 Rh8 16. h4 h6 17. Rh1 Qd7 18. Rh3 Rag8 19. Qh1 Qd8 20. Qh2 Ba6 21. a3 Nd4 22. a4 Nc2 23. Rh1 Kg7 24. hxg5 hxg5 25. Rh7+ Rxh7 26. Qxh7+ Kf8 27. Rh6 Nxe3 28. Kxe3 Ke8 29. Rxf6 Kd7 30. Rf7 Re8 31. Nd5 Bb7 32. Nf6+ Kc8 33. Nxe8 |
| ECO A17 in 1977 play it! weyerstrass defeats black's de lange in 81 moves | 1. c4 Nf6 2. Nc3 e6 3. Nf3 d5 4. cxd5 exd5 5. d4 Be7 6. Bg5 O-O 7. e3 Nbd7 8. Bd3 Re8 9. Qc2 Nf8 10. O-O c6 11. Rab1 h6 12. Bxf6 Bxf6 13. b4 Bg4 14. Nd2 Be7 15. Rfc1 Bd6 16. b5 Qg5 17. Kh1 Qh5 18. Nf1 Ne6 19. bxc6 bxc6 20. Be2 Bxe2 21. Nxe2 c5 22. Neg3 Qg5 23. f4 Qf6 24. f5 Bxg3 25. fxe6 cxd4 26. exf7+ Qxf7 27. Nxg3 dxe3 28. Qd3 Rad8 29. Rf1 Qe7 30. Rbe1 d4 31. Rf4 Qc5 32. Ne2 Qa5 33. Ref1 Qd2 34. Rd1 Qxa2 35. Rxd4 Rxd4 36. Nxd4 e2 37. Re1 Rd8 38. Qxe2 Qxe2 39. Nxe2 Re8 40. Kg1 a5 41. Kf2 |
| ECO A16 in 1977 play it! weyerstrass defeats black's zijtsel in 63 moves | 1. c4 Nf6 2. Nc3 e5 3. g3 d5 4. cxd5 Nxd5 5. Bg2 c6 6. Nf3 Nxc3 7. bxc3 e4 8. Nd4 c5 9. Nc2 Bf5 10. Ne3 Bd7 11. Bxe4 Bc6 12. Qc2 Be7 13. Rb1 b6 14. O-O g6 15. Rd1 O-O 16. d4 Bxe4 17. Qxe4 Nd7 18. Nd5 Bd6 19. Bf4 Re8 20. Qf3 Bxf4 21. Nxf4 cxd4 22. cxd4 Rc8 23. Rbc1 Nf6 24. Qd3 Ne4 25. f3 Nd6 26. e4 Qd7 27. Nd5 Qd8 28. Rxc8 Nxc8 29. Rc1 f5 30. Rc7 fxe4 31. fxe4 Rf8 32. Rxc8 |
| ECO A10 in 1980 play it! weyerstrass defeats black's te winkel in 117 moves | 1. c4 f5 2. g3 Nf6 3. Bg2 e6 4. Nc3 d5 5. d4 c6 6. e3 Be7 7. b3 O-O 8. Bb2 Bd7 9. Nge2 Be8 10. Nf4 Bf7 11. Qc2 Nbd7 12. Nd3 Ng4 13. h3 Ngf6 14. f3 Bd6 15. Ne2 Qc7 16. g4 b6 17. cxd5 Nxd5 18. Qd2 Bg3+ 19. Nxg3 Qxg3+ 20. Qf2 Qxf2+ 21. Kxf2 fxg4 22. hxg4 Bg6 23. Ke2 Rac8 24. e4 Nf4+ 25. Nxf4 Rxf4 26. Bc1 Rff8 27. Ba3 Rfe8 28. Rac1 e5 29. d5 cxd5 30. exd5 Nc5 31. Rhd1 e4 32. Bxc5 exf3+ 33. Kxf3 Be4+ 34. Kg3 Bxg2 35. Kxg2 Rxc5 36. Kf3 Kf7 37. Rxc5 bxc5 38. Rc1 Ke7 39. Rxc5 Kd6 40. Ra5 Re7 41. Kf4 Rb7 42. Kf5 Re7 43. b4 Rb7 44. a3 Re7 45. Kf4 Rc7 46. Ke3 Rc4 47. g5 Rg4 48. Ra6+ Kxd5 49. Kf3 Rc4 50. Rxa7 g6 51. b5 Rc3+ 52. Ke2 Rb3 53. a4 Rb4 54. Kd3 Kc5 55. Kc3 Rg4 56. Rc7+ Kb6 57. Rc6+ Kb7 58. a5 Rg3+ 59. Kb4 |
| ECO A20 in 1986 play it! weyerstrass defeats black's thurkov in 101 moves | 1. c4 e5 2. g3 Nc6 3. Bg2 d6 4. Nc3 Be7 5. d3 Nf6 6. e4 Nd4 7. Nce2 c5 8. Nxd4 cxd4 9. f4 Nd7 10. Nf3 O-O 11. O-O a5 12. b3 Qc7 13. f5 Nc5 14. g4 Rb8 15. g5 f6 16. g6 hxg6 17. Nh4 Kf7 18. Nxg6 Ke8 19. Qh5 Kd8 20. Nxf8 Bxf8 21. Rf3 Qe7 22. Bd2 b6 23. Rg3 Bd7 24. Rb1 Kc7 25. a3 Nb7 26. Qd1 Be8 27. Bf3 Qf7 28. b4 a4 29. Kf2 b5 30. Qc2 Kb6 31. Rgg1 Rc8 32. Rbc1 Qg8 33. Be2 Qh7 34. Kg2 g5 35. Qd1 Rc7 36. cxb5 Bxb5 37. Rxc7 Qxc7 38. Qb1 Qd7 39. Qa2 Nd8 40. Qg8 Be7 41. Rc1 Nc6 42. Kf2 Qa7 43. Qg7 Qd7 44. Ke1 Na7 45. Bxg5 fxg5 46. f6 Qe6 47. Qxe7 Qxe7 48. fxe7 Bd7 49. Bh5 Kb7 50. e8=Q Bxe8 51. Bxe8 |
| ECO A17 in 1984 play it! weyerstrass defeats black's masmeijer in 45 moves | 1. c4 Nf6 2. Nc3 e6 3. Nf3 d5 4. cxd5 exd5 5. d4 c5 6. Bg5 cxd4 7. Bxf6 gxf6 8. Nxd4 Qa5 9. Nb3 Qb4 10. e3 Be6 11. a3 Qd6 12. Qf3 Qe5 13. Bb5+ Nd7 14. Bxd7+ Kxd7 15. Rd1 Kc6 16. Rd4 Rd8 17. O-O Bd6 18. g3 b6 19. Rc1 Kb7 20. Rcd1 h5 21. Qg2 Kb8 22. Nxd5 h4 23. Nb4 |
| ECO A20 in 1982 play it! weyerstrass defeats black's van der bergh p in 87 moves | 1. c4 e5 2. g3 c6 3. d4 exd4 4. Qxd4 d5 5. cxd5 cxd5 6. Bg2 Nf6 7. Nf3 Nc6 8. Qa4 Be7 9. O-O O-O 10. Be3 Bf5 11. Nc3 Qd7 12. Rfd1 Rfd8 13. Rd2 Ne4 14. Nxe4 Bxe4 15. Rad1 Bb4 16. Ne5 Nxe5 17. Qxb4 Bxg2 18. Kxg2 Qc6 19. Qc5 Nc4 20. Rxd5 Nxe3+ 21. fxe3 Qxc5 22. Rxd8+ Rxd8 23. Rxd8+ Qf8 24. Rxf8+ Kxf8 25. Kf3 Ke7 26. Ke4 Ke6 27. b4 h5 28. a4 g6 29. h3 b6 30. Kd4 Kd6 31. Kc4 a6 32. Kd4 f6 33. Kc4 Kc6 34. h4 Kd6 35. Kd4 Kc6 36. Kc4 Kd6 37. a5 bxa5 38. bxa5 Kc6 39. e4 Kd6 40. Kd4 Kc6 41. e5 fxe5+ 42. Kxe5 Kb5 43. e4 Kxa5 44. Kd6 |