| ECO A15 in 1976 play it! weyerstrass defeats black's verbeek h in 71 moves | 1. c4 Nf6 2. Nf3 g6 3. g3 Bg7 4. Bg2 O-O 5. O-O c5 6. Nc3 Nc6 7. d4 d6 8. d5 Na5 9. Nd2 e5 10. a3 b6 11. b4 Nb7 12. Rb1 Ne8 13. e4 f5 14. exf5 gxf5 15. Bb2 Bd7 16. f4 Nf6 17. Qc2 Ng4 18. Nd1 Rc8 19. h3 Nh6 20. b5 Qe8 21. Re1 Qg6 22. fxe5 dxe5 23. Bxe5 Rce8 24. Nf3 Nd6 25. Nf2 Ne4 26. Nh4 Qf7 27. Bxg7 Qxg7 28. Nxe4 fxe4 29. Re3 Qd4 30. Re1 Nf7 31. Qe2 Ne5 32. Kh1 Nxc4 33. Rxe4 Rxe4 34. Bxe4 Re8 35. Bxh7+ Kh8 36. Be4 |
| ECO A21 in 1980 play it! weyerstrass defeats black's sargon compute in 71 moves | 1. c4 e5 2. Nc3 d6 3. g3 Be6 4. Bg2 Nc6 5. d3 Be7 6. b4 Nf6 7. b5 Na5 8. Nf3 O-O 9. O-O Ng4 10. h3 Nf6 11. Ng5 d5 12. Nxe6 fxe6 13. Qa4 c6 14. Bd2 cxb5 15. cxb5 b6 16. Rac1 Rc8 17. Kh2 Rc5 18. a3 Qd7 19. Rb1 a6 20. bxa6 Bd8 21. Nb5 Ne8 22. a7 Rc8 23. Bb4 Rf5 24. e4 Rf7 25. Bxa5 bxa5 26. Qb3 d4 27. f4 exf4 28. Rxf4 Bb6 29. Rxf7 Kxf7 30. Nd6+ Qxd6 31. Qxb6 Qxb6 32. Rxb6 Nc7 33. Rb8 Re8 34. e5 h6 35. Rb7 Re7 36. Rxc7 |
| ECO A10 in 1990 play it! weyerstrass defeats black's sanatamaria in 27 moves | 1. c4 d6 2. Nc3 g6 3. g3 Bg7 4. Bg2 e5 5. e4 f5 6. exf5 gxf5 7. Qh5+ Kf8 8. d3 Nf6 9. Qh4 c6 10. Bh6 Qe7 11. Nh3 Nbd7 12. O-O-O Bxh6+ 13. Qxh6+ Qg7 14. Qd2 |
| ECO A20 in 1986 play it! weyerstrass defeats black's de man in 93 moves | 1. c4 e5 2. g3 c6 3. d4 Bb4+ 4. Bd2 Bxd2+ 5. Qxd2 exd4 6. Qxd4 Qf6 7. Nf3 Qxd4 8. Nxd4 Ne7 9. Nc3 Na6 10. Bg2 O-O 11. e4 f5 12. exf5 Nxf5 13. Nxf5 Rxf5 14. O-O Nc7 15. Rad1 Rf8 16. Rd2 Ne8 17. Ne4 Rb8 18. Rfd1 b5 19. c5 a5 20. Bh3 d5 21. cxd6 Bxh3 22. d7 Bxd7 23. Rxd7 Rf7 24. Kf1 h6 25. Rd8 Rxd8 26. Rxd8 Re7 27. Nd6 Kf8 28. Rc8 Re6 29. Nxe8 Rxe8 30. Rxc6 Re4 31. Rc2 Ke7 32. Re2 Rxe2 33. Kxe2 Ke6 34. Ke3 Kd5 35. Kd3 a4 36. f3 g6 37. Kc3 Kc5 38. a3 h5 39. f4 Kd5 40. Kd3 Kc5 41. h3 Kd5 42. g4 h4 43. Ke3 b4 44. axb4 Kc4 45. f5 gxf5 46. g5 Kb3 47. g6 |
| ECO A22 in 1976 play it! weyerstrass defeats black's van der heijden in 69 moves | 1. c4 e5 2. Nc3 Nf6 3. g3 d5 4. cxd5 Nxd5 5. Bg2 Nxc3 6. bxc3 Nc6 7. Bxc6+ bxc6 8. d3 Be6 9. Nf3 Bc5 10. O-O Bh3 11. Re1 f6 12. Nd2 h5 13. Ne4 Bb6 14. Qa4 Qd5 15. Be3 h4 16. c4 Qa5 17. Qxc6+ Ke7 18. Bc5+ Bxc5 19. Qxc5+ Qxc5 20. Nxc5 hxg3 21. fxg3 Bg4 22. Rab1 Rh7 23. Rb7 Rah8 24. h4 Kd6 25. Ne4+ Kc6 26. Rxa7 g5 27. Nxf6 Rg7 28. Nxg4 gxh4 29. Nxe5+ Kb6 30. Ra3 Rxg3+ 31. Kh1 Rhg8 32. Nf3 Rh3+ 33. Nh2 Rg5 34. Rb1+ Kc6 35. Ra6+ |
| ECO A15 in 1975 play it! weyerstrass defeats black's ten kate in 83 moves | 1. c4 Nf6 2. Nf3 g6 3. g3 d5 4. cxd5 Nxd5 5. Nc3 Nxc3 6. bxc3 Bg7 7. Bg2 c5 8. O-O Nc6 9. Rb1 O-O 10. Qc2 e5 11. d3 Qe7 12. Nd2 Be6 13. Bxc6 bxc6 14. Ba3 f5 15. Nb3 Bxb3 16. Qxb3+ Rf7 17. Qc4 Bf8 18. d4 f4 19. Bxc5 Qf6 20. dxe5 Qxe5 21. Rb7 Qf5 22. e4 fxe3 23. Rxf7 Qxf7 24. Qxf7+ Kxf7 25. fxe3+ Kg7 26. Rxf8 Rxf8 27. Bxf8+ Kxf8 28. Kf2 Ke7 29. Kf3 Kf6 30. Ke4 Ke6 31. Kd4 Kd6 32. a3 g5 33. g4 h6 34. a4 c5+ 35. Kc4 Kc6 36. e4 Kd6 37. Kb5 Ke5 38. Kxc5 Kxe4 39. c4 Ke5 40. Kc6 Kd4 41. c5 Kc4 42. Kd6 |
| ECO A10 in 1991 play it! weyerstrass defeats black's vedder in 61 moves | 1. c4 d6 2. Nc3 Nf6 3. g3 g6 4. Bg2 c5 5. e4 Nc6 6. Nge2 Bg7 7. d3 O-O 8. O-O e5 9. h3 Be6 10. f4 exf4 11. Nxf4 Bd7 12. Be3 a6 13. g4 Qc8 14. Qd2 Re8 15. Nfd5 Nxd5 16. Nxd5 Qd8 17. Bg5 Qa5 18. Qf4 Ne5 19. Nf6+ Kh8 20. Nxe8 Rxe8 21. Bf6 Be6 22. g5 b5 23. Qh4 bxc4 24. dxc4 Nxc4 25. Rf4 Qd2 26. Raf1 Ne3 27. R1f2 Qd1+ 28. Kh2 Nxg2 29. Kxg2 d5 30. Qh6 Bxh3+ 31. Kh2 |
| ECO A17 in 1977 play it! weyerstrass defeats black's van keekum in 51 moves | 1. c4 Nf6 2. Nc3 e6 3. Nf3 c5 4. g3 g6 5. Bg2 Bg7 6. d4 O-O 7. O-O cxd4 8. Nxd4 Nc6 9. Nc2 a6 10. e4 d6 11. b3 h6 12. Bb2 Qa5 13. Qd2 Rd8 14. Rfd1 e5 15. Nd5 Qxd2 16. Nxf6+ Bxf6 17. Rxd2 b6 18. Rad1 Be7 19. Ba3 Ra7 20. Ne3 Nd4 21. Bb2 Nc6 22. Nd5 Bg5 23. f4 exf4 24. gxf4 Ne7 25. fxg5 Nxd5 26. Rxd5 |
| ECO A17 in 1980 play it! weyerstrass defeats black's disselhoff in 79 moves | 1. c4 Nf6 2. Nc3 e6 3. Nf3 b6 4. g3 Bb7 5. Bg2 d5 6. e3 c5 7. O-O Be7 8. b3 O-O 9. Bb2 Nc6 10. d3 a6 11. Qe2 Qc7 12. Rac1 dxc4 13. bxc4 Rfd8 14. Rfd1 Rd7 15. Rb1 Rad8 16. a3 Ba8 17. Ba1 h6 18. h3 Kf8 19. Ne1 Ne5 20. f4 Bxg2 21. Kxg2 Qb7+ 22. Kh2 Nc6 23. Na4 b5 24. Bxf6 gxf6 25. Qh5 Qa7 26. Qxh6+ Ke8 27. Nc3 bxc4 28. Qh8+ Bf8 29. Ne4 cxd3 30. Nxf6+ Ke7 31. Nxd7 Rxd7 32. Rxd3 Rxd3 33. Nxd3 c4 34. Ne5 Na5 35. Qh7 Ke8 36. Qe4 c3 37. Qa4+ Ke7 38. Qxa5 c2 39. Rc1 f6 40. Nc6+ |
| ECO A15 in 1988 play it! weyerstrass defeats black's otto in 39 moves | 1. c4 Nf6 2. g3 c5 3. Bg2 Nc6 4. Nc3 g6 5. e4 d6 6. Nge2 Bg7 7. O-O O-O 8. d3 a6 9. h3 Bd7 10. Be3 e6 11. f4 Qc7 12. Rc1 Rad8 13. Qd2 b6 14. g4 Bc8 15. f5 gxf5 16. exf5 exf5 17. Bh6 Bxh6 18. Qxh6 Ne8 19. gxf5 f6 20. Bd5+ |
| ECO A20 in 1991 play it! weyerstrass defeats black's voortman in 75 moves | 1. c4 e5 2. g3 Ne7 3. Bg2 Ng6 4. Nc3 Nc6 5. e3 Bc5 6. Nge2 Nce7 7. a3 a5 8. O-O c6 9. Ne4 d6 10. d4 exd4 11. exd4 Bb6 12. N2c3 d5 13. cxd5 cxd5 14. Nc5 O-O 15. Re1 Bxc5 16. dxc5 Be6 17. Be3 Ne5 18. Bg5 f6 19. Bf4 d4 20. Nb5 N7c6 21. Nd6 Qd7 22. Qa4 Bh3 23. Bh1 Qg4 24. Qb3+ Kh8 25. f3 Qd7 26. Rad1 Be6 27. Qc2 Bd5 28. Qf2 b6 29. b4 axb4 30. axb4 Ra2 31. Re2 Rxe2 32. Qxe2 bxc5 33. bxc5 g5 34. Bc1 Ra8 35. f4 gxf4 36. Bxd5 fxg3 37. hxg3 Ne7 38. Bxa8 |
| ECO A15 in 1987 play it! weyerstrass defeats black's woortman in 59 moves | 1. c4 Nf6 2. g3 g6 3. Bg2 Bg7 4. Nc3 O-O 5. e4 d6 6. Nge2 e5 7. O-O Ne8 8. d4 Nc6 9. Be3 h6 10. h3 Bd7 11. Rc1 b6 12. f4 exf4 13. gxf4 Ne7 14. Qd2 Bc6 15. d5 Bd7 16. Bd4 f5 17. e5 c5 18. dxc6 Bxc6 19. Nd5 Rc8 20. Nec3 Ba8 21. Nxe7+ Qxe7 22. Nd5 Qe6 23. Rfe1 Nc7 24. exd6 Qxd6 25. Bxg7 Kxg7 26. Qd4+ Rf6 27. Re7+ Kf8 28. Rxc7 Rxc7 29. Qxf6+ Qxf6 30. Nxf6 |
| ECO A36 in 1976 play it! weyerstrass defeats black's smallegange in 63 moves | 1. c4 c5 2. Nc3 Nc6 3. g3 g6 4. Bg2 Bg7 5. d3 Nf6 6. e4 d6 7. Nge2 a6 8. Rb1 Rb8 9. a3 O-O 10. b4 cxb4 11. axb4 b5 12. cxb5 axb5 13. d4 e6 14. e5 Nd5 15. Nxd5 exd5 16. exd6 Re8 17. O-O Bf5 18. Rb2 Qb6 19. Bxd5 Nxd4 20. Be3 Rxe3 21. fxe3 Nf3+ 22. Rxf3 Bxb2 23. Qb3 Bg7 24. Bxf7+ Kh8 25. Be6 Be4 26. Rf4 Qc6 27. d7 Bh1 28. Rf2 Ra8 29. h4 Ra1+ 30. Kh2 Qd6 31. Qc2 Bc6 32. Qxc6 |
| ECO A20 in 1986 play it! weyerstrass defeats black's lamme in 115 moves | 1. c4 e5 2. g3 Nc6 3. Bg2 g6 4. Nc3 Bg7 5. d3 d6 6. Rb1 f5 7. e3 Nf6 8. Nge2 O-O 9. b4 Qe7 10. b5 Nd8 11. O-O Be6 12. a4 Rc8 13. f4 Kh8 14. Qd2 c5 15. Bb2 Nf7 16. Rbc1 b6 17. Rfe1 Rcd8 18. Nd5 Bxd5 19. cxd5 e4 20. Bxf6 Bxf6 21. dxe4 fxe4 22. Rc4 Rde8 23. Nc3 Bxc3 24. Qxc3+ Kg8 25. Qc2 Qb7 26. Rxe4 a6 27. Rxe8 Rxe8 28. Qc4 axb5 29. Qxb5 Ra8 30. e4 Qa6 31. Rb1 Qxa4 32. Qxa4 Rxa4 33. Rxb6 Ra1+ 34. Bf1 Re1 35. Rb8+ Kg7 36. Re8 Rd1 37. Kf2 Rd2+ 38. Be2 Rb2 39. Ke3 Rb3+ 40. Kd2 Rb2+ 41. Kd1 h5 42. e5 Rb4 43. e6 Rd4+ 44. Ke1 Nh6 45. Rd8 Nf5 46. Bf3 Rd3 47. Rd7+ Kf8 48. Bxh5 Ne7 49. Bxg6 Nxg6 50. Rxd6 Ke8 51. Ke2 c4 52. Rc6 Rxd5 53. Rxc4 Ke7 54. g4 Kf6 55. Ke3 Rd6 56. f5 Ne5 57. Re4 Nxg4+ 58. Kf4 |
| ECO A15 in 1988 play it! weyerstrass defeats black's van der wal in 37 moves | 1. c4 Nf6 2. g3 g6 3. Bg2 Bg7 4. Nc3 O-O 5. e4 d6 6. Nge2 e5 7. O-O Nc6 8. f4 Ne7 9. d3 c6 10. h3 h6 11. Be3 Qc7 12. Qd2 Kh7 13. d4 Nd7 14. g4 f5 15. exf5 gxf5 16. fxe5 dxe5 17. d5 f4 18. d6 fxe3 19. Qc2+ |
| ECO A20 in 1981 play it! weyerstrass defeats black's van dungen in 63 moves | 1. c4 e5 2. g3 Nc6 3. Bg2 f5 4. Nc3 Nf6 5. d3 Bc5 6. e3 O-O 7. Nge2 d6 8. a3 a5 9. d4 exd4 10. exd4 Bb6 11. Bg5 Qe8 12. Bxf6 Rxf6 13. Nd5 Rf8 14. Nxb6 cxb6 15. O-O Ne7 16. Re1 Qh5 17. Nf4 Qxd1 18. Raxd1 g5 19. Rxe7 gxf4 20. gxf4 Rf6 21. Bd5+ Kf8 22. Rde1 a4 23. Re8+ Kg7 24. R1e7+ Kh6 25. Rc7 Rg6+ 26. Kf1 Rg4 27. Rh8 Rxf4 28. Rhxh7+ Kg6 29. Rhg7+ Kh6 30. Rg8 Rxd4 31. Ke2 f4 32. Rcxc8 |
| ECO A13 in 1978 play it! weyerstrass defeats black's koomen in 51 moves | 1. c4 e6 2. Nc3 Nf6 3. Nf3 Be7 4. d4 d5 5. cxd5 exd5 6. Bg5 O-O 7. e3 Bg4 8. h3 Be6 9. Bd3 Nbd7 10. Qc2 c5 11. g4 Rc8 12. Bxf6 Nxf6 13. g5 Ne4 14. Bxe4 dxe4 15. Qxe4 cxd4 16. Nxd4 Rxc3 17. Nxe6 Qa5 18. O-O Rc6 19. Nxf8 Qxg5+ 20. Kh1 Rh6 21. Qg2 Qf5 22. Kh2 Kxf8 23. f4 Bd6 24. Rg1 g5 25. Qg4 Qf6 26. Qxg5 |
| ECO A15 in 1981 play it! weyerstrass defeats black's nagel j in 87 moves | 1. c4 Nf6 2. Nf3 e6 3. Nc3 d5 4. cxd5 exd5 5. d4 Be7 6. Bg5 c6 7. Qc2 Bg4 8. Ne5 Bh5 9. e3 Nbd7 10. Nxd7 Nxd7 11. Bxe7 Qxe7 12. Bd3 Bg6 13. O-O Bxd3 14. Qxd3 O-O 15. Rfc1 f5 16. Rab1 Rae8 17. b4 a6 18. a4 Nb6 19. b5 axb5 20. axb5 Nc4 21. bxc6 bxc6 22. Ne2 Qe4 23. Nf4 g5 24. Qxe4 fxe4 25. Nh5 Ra8 26. Ra1 Kf7 27. h3 Rfb8 28. g4 Ke7 29. Ng3 Kd7 30. Rxa8 Rxa8 31. Nxe4 dxe4 32. Rxc4 Kd6 33. Rc5 h6 34. Re5 Rf8 35. Kg2 Rf6 36. Rxe4 Kd5 37. Re5+ Kc4 38. Kg3 Kd3 39. Rf5 Re6 40. h4 gxh4+ 41. Kxh4 Ke4 42. Kg3 Rg6 43. Re5+ Kd3 44. f4 |
| ECO A11 in 1979 play it! weyerstrass defeats black's dijk in 33 moves | 1. c4 c6 2. Nc3 d5 3. cxd5 cxd5 4. d4 Nc6 5. Bf4 a6 6. e3 e6 7. Nf3 Nf6 8. Bd3 Bd7 9. O-O Nb4 10. Bb1 g6 11. Re1 Qb6 12. Be5 Bg7 13. Qb3 a5 14. a3 a4 15. Qxb4 Qxb4 16. axb4 O-O 17. Bc2 |
| ECO A17 in 1981 play it! weyerstrass defeats black's rutgersson in 55 moves | 1. c4 Nf6 2. Nc3 e6 3. Nf3 d5 4. cxd5 exd5 5. d4 Bb4 6. Bg5 Qd6 7. Bxf6 Bxc3+ 8. bxc3 Qxf6 9. Qb3 c6 10. e3 O-O 11. c4 Qd6 12. Rc1 Nd7 13. cxd5 cxd5 14. Bd3 Nf6 15. O-O b6 16. Rc2 Bb7 17. Rfc1 Rac8 18. Ne5 g6 19. g3 Nd7 20. Qa4 Rxc2 21. Rxc2 Nxe5 22. dxe5 Qb8 23. Qd7 Rd8 24. Qe7 Re8 25. Qd6 Qxd6 26. exd6 Rd8 27. Rc7 Rxd6 28. Rxb7 |