| ECO A20 in 1986 play it! weyerstrass defeats black's voortman in 54 moves | 1. c4 e5 2. g3 c6 3. d4 Bb4+ 4. Bd2 Qe7 5. dxe5 Bxd2+ 6. Qxd2 Qxe5 7. Nf3 Qe6 8. Nd4 Qf6 9. Nc3 Ne7 10. Bg2 Nf5 11. Nxf5 Qxf5 12. Rd1 O-O 13. O-O Na6 14. b3 Nc7 15. Kh1 b5 16. cxb5 Nxb5 17. e4 Qe5 18. Na4 Ba6 19. f4 Qh5 20. Bf3 Qh3 21. Nc5 Nc3 22. Nxa6 Nxd1 23. Rxd1 Rad8 24. e5 Rfe8 25. Bg2 Qg4 26. Qd3 h5 27. h3 Qe6 |
| ECO A16 in 1976 play it! weyerstrass defeats black's van der laan in 72 moves | 1. c4 Nf6 2. Nc3 g6 3. g3 Bg7 4. Bg2 O-O 5. e4 d6 6. Nge2 e5 7. O-O Nc6 8. d3 Be6 9. Bg5 Qd7 10. Bxf6 Bxf6 11. f4 Bg4 12. Qd2 Bg7 13. Rab1 f5 14. h3 Bh5 15. b4 Rae8 16. b5 Nd8 17. Qe3 Bxe2 18. Nxe2 c5 19. Qd2 Ne6 20. a4 Bh6 21. exf5 gxf5 22. a5 Qg7 23. Kh2 Kh8 24. Rg1 exf4 25. gxf4 Qe7 26. Bd5 Ng7 27. Rbe1 Qh4 28. Ref1 Re7 29. Ng3 Rfe8 30. Rf3 Qf6 31. Qg2 Qf8 32. Qb2 Re3 33. Rgf1 Qe7 34. Qa1 b6 35. Nxf5 Re2+ 36. Kh1 Qd8 |
| ECO A30 in 1975 play it! weyerstrass defeats black's voortman in 85 moves | 1. c4 c5 2. g3 g6 3. Bg2 Bg7 4. Nc3 Nc6 5. d3 Nf6 6. e4 d6 7. Nge2 Bg4 8. h3 Bd7 9. O-O Qc8 10. Kh2 a6 11. Rb1 e5 12. Bg5 Ne7 13. a3 h6 14. Be3 O-O 15. Qd2 Kh7 16. b4 cxb4 17. axb4 Qc7 18. f4 exf4 19. gxf4 Nh5 20. Bf3 Qc8 21. Ng1 Nf6 22. c5 dxc5 23. Bxc5 Re8 24. Bxe7 Rxe7 25. e5 Nh5 26. Bxh5 gxh5 27. Nd5 Re6 28. Rbc1 Bc6 29. Nb6 Qb8 30. Nxa8 Qxa8 31. d4 Rg6 32. Rf2 b5 33. f5 Rg5 34. f6 Bxf6 35. Rxc6 Bxe5+ 36. dxe5 Qxc6 37. Rxf7+ Kg8 38. Rf6 Qe8 39. Nf3 Rg6 40. Rxg6+ Qxg6 41. Qg2 Kf7 42. Qxg6+ Kxg6 43. Nd4 |
| ECO A15 in 1981 play it! weyerstrass defeats black's van keekem in 57 moves | 1. c4 Nf6 2. g3 e5 3. Bg2 c6 4. d4 e4 5. Nc3 d5 6. cxd5 cxd5 7. Bg5 Bb4 8. Qb3 Nc6 9. e3 Bg4 10. h3 Be6 11. Ne2 Be7 12. Bxf6 Bxf6 13. Nf4 O-O 14. Ncxd5 Bxd4 15. exd4 Nxd4 16. Qc4 Nf3+ 17. Bxf3 exf3 18. Nxe6 fxe6 19. Nf4 Qa5+ 20. Qc3 Qb5 21. a4 Qa6 22. Qxf3 e5 23. Qb3+ Kh8 24. Ne2 Rxf2 25. Kxf2 Rf8+ 26. Ke1 Qf6 27. Qe3 Qc6 28. Rf1 Rd8 29. Qd2 |
| ECO A25 in 1975 play it! weyerstrass defeats black's voortman in 21 moves | 1. c4 e5 2. Nc3 Nc6 3. g3 Bc5 4. Bg2 Nf6 5. e3 d6 6. Nge2 Be6 7. d4 exd4 8. exd4 Bxd4 9. Nxd4 Nxd4 10. Qxd4 c5 11. Qd3 |
| ECO A21 in 1977 play it! weyerstrass defeats black's van hamond in 69 moves | 1. c4 e5 2. Nc3 f5 3. g3 Nf6 4. Bg2 Nc6 5. e3 d6 6. d4 Be7 7. Nge2 O-O 8. Rb1 Qe8 9. b4 Kh8 10. b5 Nd8 11. Bb2 Be6 12. d5 Bf7 13. Qc2 Bg6 14. f4 Nf7 15. O-O Nh6 16. h3 Nd7 17. Rbe1 Ng8 18. Na4 Ngf6 19. c5 Bd8 20. c6 bxc6 21. bxc6 Nb6 22. Nxb6 axb6 23. fxe5 dxe5 24. Qc3 Rxa2 25. Qxe5 Qxe5 26. Bxe5 Re8 27. Bf4 Bf7 28. Nc3 Ra5 29. d6 cxd6 30. Bxd6 Nd5 31. Nxd5 Bxd5 32. c7 Bg5 33. Rxf5 Bxg2 34. Rxa5 Bxh3 35. Rxg5 |
| ECO A10 in 1988 play it! weyerstrass defeats black's brontz alexander in 37 moves | 1. c4 b6 2. Nc3 Bb7 3. e4 e5 4. Nge2 Nf6 5. d3 Nc6 6. g3 Bc5 7. Bg2 Ng4 8. O-O Ne7 9. h3 Nf6 10. d4 exd4 11. Nxd4 d6 12. Bg5 Bxd4 13. Qxd4 Nc6 14. Qd2 Ne5 15. b3 h6 16. Be3 Qe7 17. f4 Ng6 18. e5 Bxg2 19. exf6 |
| ECO A15 in 1982 play it! weyerstrass defeats black's hervir in 51 moves | 1. c4 Nf6 2. g3 e5 3. Bg2 c6 4. e4 Bc5 5. Nc3 d6 6. Nge2 Be6 7. b3 d5 8. exd5 cxd5 9. d4 exd4 10. Nxd4 Qb6 11. Na4 Bb4+ 12. Bd2 Qxd4 13. Bxb4 Qe5+ 14. Kf1 Nc6 15. Bc3 Qf5 16. Bxf6 gxf6 17. cxd5 O-O-O 18. Nc3 Nb4 19. Qc1 Kb8 20. dxe6 Rc8 21. Be4 Qe5 22. Qf4 Rxc3 23. Qxe5+ fxe5 24. exf7 Rf8 25. Bxh7 Rxf7 26. Be4 |
| ECO A10 in 1988 play it! weyerstrass defeats black's overmeier in 45 moves | 1. c4 f5 2. g3 Nf6 3. Bg2 e6 4. d3 Be7 5. e4 fxe4 6. dxe4 d6 7. Nc3 O-O 8. Nge2 Qe8 9. h3 Nc6 10. f4 Qh5 11. Be3 Bd7 12. Qd2 Rab8 13. c5 a6 14. cxd6 cxd6 15. Bb6 Ne8 16. O-O-O Kh8 17. Kb1 Bd8 18. g4 Qg6 19. Bxd8 Rxd8 20. Ka1 b5 21. f5 exf5 22. exf5 Bxf5 23. Bxc6 |
| ECO A16 in 1976 play it! weyerstrass defeats black's voortman in 53 moves | 1. c4 Nf6 2. Nc3 b6 3. Nf3 Bb7 4. g3 c5 5. Bg2 e6 6. O-O Na6 7. d3 Nc7 8. e4 d6 9. Nh4 Be7 10. e5 Bxg2 11. exf6 Bxf1 12. fxe7 Qxe7 13. Kxf1 O-O 14. b3 d5 15. Qe2 Rad8 16. Bb2 d4 17. Ne4 f5 18. Nd2 f4 19. Re1 Rde8 20. Nhf3 Qf6 21. Ne5 Qf5 22. g4 Qg5 23. Ndf3 Qd8 24. h4 Na6 25. Qe4 Qa8 26. Nc6 Nb8 27. Ne7+ |
| ECO A36 in 1976 play it! weyerstrass defeats black's brueggemann in 71 moves | 1. c4 c5 2. Nc3 Nc6 3. g3 g6 4. Bg2 Bg7 5. d3 d6 6. e4 Nf6 7. Nge2 O-O 8. Rb1 e6 9. O-O Rb8 10. a3 b6 11. f4 Bb7 12. h3 Ne7 13. b4 cxb4 14. axb4 d5 15. cxd5 exd5 16. e5 Ne8 17. Nd4 Nd6 18. Nf3 Ne8 19. Ne2 Nc7 20. Ned4 Ne6 21. Bb2 Qd7 22. h4 Nxd4 23. Nxd4 Nc6 24. Nxc6 Bxc6 25. f5 Bh6 26. Qe2 Rbc8 27. Bh3 d4 28. Kh2 Ba4 29. fxg6 Qd5 30. gxf7+ Kh8 31. Bxc8 Rxc8 32. e6 Bf8 33. Rbc1 Rxc1 34. Rxc1 Bc6 35. Rxc6 Qxc6 36. Bxd4+ |
| ECO A10 in 1989 play it! weyerstrass defeats black's kerkmeester in 57 moves | 1. c4 g6 2. Nc3 Bg7 3. e4 d6 4. g3 c6 5. Bg2 Nd7 6. Nge2 e5 7. O-O Ne7 8. d3 O-O 9. h3 Qc7 10. Be3 f5 11. Qd2 Nf6 12. Rac1 Be6 13. f4 Qd7 14. Kh2 Kh8 15. b3 b6 16. Rcd1 Rad8 17. Qc1 Qc7 18. Rfe1 Bc8 19. d4 Nxe4 20. Nxe4 fxe4 21. Bxe4 Nf5 22. Bg1 exf4 23. Nxf4 Bh6 24. Rf1 g5 25. Nh5 g4 26. Qc3 d5 27. cxd5 gxh3 28. dxc6 Bg7 29. Qd3 |
| ECO A16 in 1982 play it! weyerstrass defeats black's leinwand in 39 moves | 1. c4 Nf6 2. Nc3 d5 3. cxd5 Nxd5 4. g3 g6 5. Bg2 Nb6 6. d3 Bg7 7. Be3 Nc6 8. Bxc6+ bxc6 9. Rc1 O-O 10. Qc2 Nd5 11. Nf3 Nxe3 12. fxe3 Rb8 13. b3 f5 14. Na4 Qd5 15. Qxc6 Qxc6 16. Rxc6 Bd7 17. Ra6 Bxa4 18. Rxa4 Bc3+ 19. Kf2 a5 20. Rc1 |
| ECO A10 in 1979 play it! weyerstrass defeats black's middelkoop in 103 moves | 1. c4 f5 2. g3 g6 3. Bg2 Bg7 4. Nc3 e5 5. d3 Nf6 6. Rb1 O-O 7. e3 d6 8. Nge2 c6 9. b4 Be6 10. b5 d5 11. bxc6 bxc6 12. cxd5 Nxd5 13. Bd2 Nd7 14. Nxd5 Bxd5 15. Bxd5+ cxd5 16. Bb4 Rf7 17. d4 Rb8 18. O-O e4 19. Nf4 Nb6 20. Ba5 Rf6 21. Rb5 Qd7 22. Qb3 Rd6 23. Bxb6 Rbxb6 24. Nxd5 Qxb5 25. Nf6+ Kf8 26. Qg8+ Ke7 27. Qxg7+ Ke6 28. d5+ Rxd5 29. Nxd5 Qxd5 30. Qxa7 Rb7 31. Qa4 Rb2 32. Qe8+ Kd6 33. Qd8+ Ke6 34. Qg8+ Kd6 35. Qxh7 Rxa2 36. Qxg6+ Ke7 37. h4 Rd2 38. Qg5+ Kf7 39. Qf4 Ke6 40. h5 Qd8 41. Kg2 Rd1 42. Rxd1 Qxd1 43. h6 Qh5 44. g4 fxg4 45. Qxe4+ Kf6 46. h7 Kg7 47. Qb7+ Kg6 48. Qb1+ Kf7 49. Qb3+ Ke7 50. Qg8 Qh3+ 51. Kg1 Qf3 52. Qg5+ |
| ECO A15 in 1982 play it! weyerstrass defeats black's den hamer in 65 moves | 1. c4 Nf6 2. g3 e5 3. Bg2 Nc6 4. Nc3 g6 5. e4 Bg7 6. Nge2 O-O 7. O-O d6 8. f4 Bd7 9. f5 Ne7 10. d3 c6 11. Bg5 h6 12. Bxf6 Bxf6 13. g4 Kh7 14. Kh1 b5 15. Ng1 b4 16. Nce2 c5 17. Nf3 Nc6 18. Qe1 Rb8 19. Rg1 h5 20. Bh3 hxg4 21. Bxg4 gxf5 22. Bxf5+ Bxf5 23. exf5 Rg8 24. Qf2 Rg7 25. Rxg7+ Kxg7 26. Ng3 Kf8 27. Ne4 Ke8 28. Rg1 Kd7 29. Rg8 Qe7 30. Rxb8 Nxb8 31. Qg3 Nc6 32. Qg8 Nd8 33. Qh7 |
| ECO A10 in 1976 play it! weyerstrass defeats black's van der berg in 53 moves | 1. c4 g6 2. Nc3 Bg7 3. g3 c6 4. e4 d6 5. Bg2 e5 6. d3 Ne7 7. Nge2 O-O 8. O-O f5 9. Rb1 a5 10. a3 Na6 11. exf5 Nxf5 12. b4 axb4 13. axb4 Nc7 14. b5 d5 15. bxc6 bxc6 16. cxd5 cxd5 17. f4 Qe7 18. Nxd5 Qc5+ 19. d4 exd4 20. Nxc7 d3+ 21. Kh1 dxe2 22. Qxe2 Qxc7 23. Bxa8 Bd7 24. Bd5+ Kh8 25. Bb2 Re8 26. Bxg7+ Kxg7 27. Qb2+ |
| ECO A20 in 1988 play it! weyerstrass defeats black's riemersma l in 41 moves | 1. c4 e5 2. g3 Nc6 3. Bg2 g6 4. Nc3 Bg7 5. e4 Nge7 6. Nge2 O-O 7. O-O f5 8. d3 d6 9. Rb1 Rb8 10. Bg5 h6 11. Be3 Be6 12. Nd5 Nd4 13. Bxd4 exd4 14. Nef4 Bf7 15. Nxe7+ Qxe7 16. exf5 gxf5 17. Re1 Be5 18. Nd5 Qd8 19. f4 Bf6 20. Qe2 Re8 21. Qxe8+ |
| ECO A10 in 1975 play it! weyerstrass defeats black's merkies in 91 moves | 1. c4 f5 2. g3 Nf6 3. Bg2 g6 4. Nc3 Bg7 5. d3 O-O 6. e4 fxe4 7. dxe4 d6 8. Nge2 Nc6 9. O-O e5 10. h3 Be6 11. Nd5 Qd7 12. Kh2 Ne7 13. Qd3 c6 14. Nxf6+ Bxf6 15. Rd1 Rad8 16. Nc3 a6 17. a4 Qc7 18. a5 Bg7 19. Be3 c5 20. Nd5 Nxd5 21. cxd5 Bd7 22. Qc2 b5 23. axb6 Qxb6 24. b4 Rc8 25. bxc5 dxc5 26. Bf1 Bb5 27. Rdb1 Rf7 28. Bc4 Kh8 29. d6 Rb7 30. Be6 Rc6 31. Bd5 Rd7 32. Bxc6 Qxc6 33. Qxc5 Rxd6 34. Qxc6 Rxc6 35. Rxb5 axb5 36. Ra8+ Bf8 37. Rxf8+ Kg7 38. Rb8 Rc4 39. Rxb5 Rxe4 40. Kg2 Kf6 41. Rb6+ Kf7 42. Rb7+ Kg8 43. Bh6 Rd4 44. Rg7+ Kh8 45. Rf7 Rd8 46. Re7 |
| ECO A10 in 1979 play it! weyerstrass defeats black's van der poel in 51 moves | 1. c4 g6 2. Nc3 Bg7 3. e4 d6 4. Nge2 e5 5. g3 Ne7 6. Bg2 O-O 7. O-O Nd7 8. b3 c6 9. Ba3 Qc7 10. d4 Kh8 11. dxe5 Bxe5 12. f4 Bxc3 13. Nxc3 f6 14. Rf2 Nc5 15. Rc1 Be6 16. Rd2 Rad8 17. Bb2 b6 18. g4 Rd7 19. f5 Bf7 20. Ne2 gxf5 21. gxf5 Bh5 22. Rc3 a6 23. Rg3 d5 24. Qa1 Rd6 25. e5 Bxe2 26. exf6 |
| ECO A20 in 1983 play it! weyerstrass defeats black's de vries in 95 moves | 1. c4 e5 2. g3 Nf6 3. Bg2 c6 4. e4 d5 5. exd5 cxd5 6. cxd5 Nxd5 7. Nf3 Nc6 8. O-O Be7 9. Re1 Qd6 10. d4 exd4 11. Nxd4 Be6 12. Nb5 Qc5 13. Bxd5 Qxb5 14. Nc3 Qa5 15. Bxe6 fxe6 16. Qg4 O-O 17. Qxe6+ Kh8 18. Be3 Bc5 19. Qd5 Bxe3 20. Rxe3 Qxd5 21. Nxd5 Rad8 22. Nc3 Rd2 23. Re2 Rfd8 24. Rae1 Kg8 25. Rxd2 Rxd2 26. Re2 Rd7 27. Kg2 Kf7 28. f4 h6 29. Kf2 Nb4 30. a3 Nc6 31. Ne4 b6 32. g4 Na5 33. Rd2 Rc7 34. b4 Nb7 35. Nd6+ Nxd6 36. Rxd6 Rc2+ 37. Ke3 Rc7 38. h4 Ke7 39. Rd3 Ke6 40. h5 Ke7 41. Ke4 Rc6 42. g5 Ke6 43. f5+ Ke7 44. f6+ gxf6 45. gxh6 Ke6 46. h7 Rc8 47. Rg3 Rh8 48. Rg7 |