| ECO A00 in 1988 play it! merten defeats white's grob henry in 51 moves | 1. b4 e5 2. Bb2 Bxb4 3. Bxe5 Nf6 4. a3 Be7 5. e3 c5 6. Be2 Nc6 7. Bb2 Qb6 8. Ra2 d5 9. Nf3 Be6 10. Ng5 Bf5 11. O-O h6 12. Nf3 Be6 13. d4 c4 14. Nc3 Ne4 15. Nd2 Nxc3 16. Bxc3 O-O 17. Rb2 Qc7 18. Qa1 Bd6 19. f4 Rac8 20. Nf3 Bg4 21. Kf2 Qe7 22. Kg3 Qxe3 23. Bd2 Bxf4+ 24. Kxg4 Qxe2 25. Bxf4 Qxg2+ 26. Bg3 |
| ECO A00 in 1990 play it! merten defeats white's grob henry by checkmate in 38 moves | 1. b4 d5 2. Bb2 Nf6 3. e3 Bf5 4. f4 Nbd7 5. Nf3 e6 6. a3 Be7 7. c4 dxc4 8. Bxc4 Nb6 9. Be2 Ne4 10. O-O Bf6 11. Nd4 Bg6 12. d3 Nd6 13. e4 Be7 14. f5 Bf6 15. fxg6 hxg6 16. Qb3 Nxe4 17. Nxe6 Qd6 18. Nf4 Bd4+ 19. Kh1 Ng3# |
| ECO A00 in 1992 play it! merten defeats white's gross david cze in 56 moves | 1. b4 d5 2. Bb2 Nf6 3. e3 Bf5 4. c4 dxc4 5. Bxc4 e6 6. a3 Nbd7 7. d4 Be7 8. Nf3 O-O 9. Nbd2 Nb6 10. Be2 Ne4 11. O-O Nd6 12. Rc1 Rc8 13. Re1 Nd7 14. Bf1 Bg4 15. h3 Bh5 16. Qb3 Nf6 17. e4 Nde8 18. Rc2 c6 19. Nh2 Nc7 20. Qg3 Bg6 21. Nhf3 Nb5 22. Bxb5 cxb5 23. Rxc8 Qxc8 24. Rc1 Qb8 25. Qc7 Bd6 26. Qc2 Bf4 27. Re1 Rc8 28. Qd1 Qc7 |
| ECO A00 in 1988 play it! merten defeats white's grob henry in 62 moves | 1. b4 Nf6 2. Bb2 a6 3. e3 d5 4. c4 Bg4 5. Nf3 Nbd7 6. cxd5 Nxd5 7. a3 e6 8. Bc4 N5f6 9. d4 Be7 10. Nbd2 O-O 11. O-O Nb6 12. h3 Nxc4 13. Nxc4 Bh5 14. Nce5 Ne4 15. Qd3 Qd5 16. g4 Bg6 17. Nxg6 hxg6 18. Rac1 Rac8 19. h4 Nd6 20. Qe2 f5 21. g5 f4 22. exf4 Rxf4 23. Ne5 Rxh4 24. f3 Bxg5 25. Nxg6 Rh6 26. Rc5 Rxg6 27. Rxd5 exd5 28. Rf2 Re8 29. Qd3 Re1+ 30. Kg2 Kf7 31. f4 Bh4+ |
| ECO A00 in 1990 play it! merten defeats white's grob henry in 42 moves | 1. b4 Nf6 2. Bb2 d5 3. e3 Nbd7 4. f4 e6 5. b5 a6 6. a4 Bd6 7. Nf3 O-O 8. Be2 c5 9. bxc6 bxc6 10. c4 Rb8 11. Qc2 a5 12. Nc3 Ba6 13. cxd5 Bxe2 14. Nxe2 cxd5 15. Rc1 Qb6 16. Bd4 Qa6 17. Qd1 Rfc8 18. O-O Rxc1 19. Qxc1 Qxe2 20. Qc6 Bb4 21. Qc7 Qc4 |
| ECO A00 in 1992 play it! merten defeats white's gross in 60 moves | 1. b4 d5 2. Bb2 Nf6 3. e3 Bf5 4. c4 dxc4 5. Bxc4 e6 6. Nf3 Nbd7 7. Nd4 Be4 8. O-O Nb6 9. Bb3 Bxb4 10. d3 Bg6 11. Ba4+ Nbd7 12. Qb3 Be7 13. e4 O-O 14. Bxd7 Qxd7 15. Nd2 c5 16. N4f3 Rfd8 17. Ne5 Qc7 18. Rac1 Nd7 19. Ndc4 Rac8 20. f4 f6 21. Nxg6 hxg6 22. Ne3 Qb6 23. Qc2 c4 24. d4 Qa6 25. Ba1 b5 26. f5 gxf5 27. exf5 e5 28. Nd5 Ba3 29. Rcd1 Qb7 30. Ne7+ Bxe7 |
| ECO A00 in 1989 play it! merten defeats white's drefke in 38 moves | 1. b4 e5 2. Bb2 Nf6 3. Bxe5 Bxb4 4. c4 Nc6 5. Bb2 O-O 6. e3 Re8 7. Nf3 d5 8. cxd5 Nxd5 9. Be2 Bf5 10. Nc3 Nxc3 11. dxc3 Bd6 12. O-O Qf6 13. Qb3 Be4 14. c4 Qh6 15. h3 Rad8 16. Nd4 Nxd4 17. Bxd4 c5 18. Bb2 Qg6 19. f3 Bc2 |
| ECO A00 in 1987 play it! merten defeats white's gro in 28 moves | 1. b4 Nf6 2. Bb2 d5 3. e3 Bf5 4. c4 e6 5. b5 Nbd7 6. Nf3 Bd6 7. a4 c5 8. d4 cxd4 9. Bxd4 e5 10. Bb2 Bxb1 11. Rxb1 Qa5+ 12. Nd2 Ne4 13. Qc2 Nxd2 14. Qxd2 Bb4 |
| ECO A00 in 1988 play it! merten defeats white's grob henry in 63 moves | 1. b4 e5 2. Bb2 Bxb4 3. Bxe5 Nf6 4. a3 Be7 5. e3 c5 6. c4 Nc6 7. Bb2 O-O 8. Nf3 d5 9. cxd5 Nxd5 10. Be2 Bf6 11. Nc3 Nxc3 12. dxc3 Qb6 13. Qc2 Bf5 14. Qc1 Rfd8 15. O-O Bd3 16. Bxd3 Rxd3 17. Qc2 Rad8 18. Rab1 Qa5 19. c4 Bxb2 20. Qxb2 R8d7 21. Ne5 Nxe5 22. Qxe5 Qd8 23. Qxc5 b6 24. Qb5 Rxa3 25. g3 h6 26. Qb2 Rad3 27. Qb5 Rd2 28. Ra1 Rc2 29. Qb3 Rdd2 30. Qb5 Qf6 31. Qb4 Rxf2 32. Rae1 |
| ECO A00 in 1989 play it! merten defeats white's groa in 52 moves | 1. b4 c6 2. c4 d5 3. cxd5 cxd5 4. Bb2 Nf6 5. e3 e6 6. a3 Be7 7. f4 O-O 8. Nf3 Ne4 9. Nc3 Bh4+ 10. g3 Bf6 11. Qc2 Nd7 12. d4 Nd6 13. Ne5 Nb6 14. Rc1 Bxe5 15. fxe5 Ndc4 16. Nd1 Qg5 17. Qb3 Bd7 18. Bxc4 Ba4 19. Qc3 Nxc4 20. O-O Rac8 21. Rf4 Bxd1 22. Rxd1 Nxe5 23. Qd2 Nc4 24. Qf2 Rc7 25. Rf1 Rfc8 26. Rxf7 Qxe3 |
| ECO A00 in 1988 play it! merten defeats white's grob henry in 56 moves | 1. b4 Nf6 2. Bb2 d5 3. e3 Bg4 4. Be2 Bxe2 5. Nxe2 e6 6. a3 c5 7. b5 Nbd7 8. O-O Be7 9. d3 O-O 10. Nd2 a6 11. a4 Qb6 12. c4 Rfd8 13. Qc2 Nf8 14. Nf3 Ng6 15. h3 h6 16. Kh1 Qc7 17. Nd2 Nh5 18. f4 d4 19. g4 Nf6 20. exd4 cxd4 21. Bxd4 axb5 22. axb5 Rxa1 23. Bxa1 Bf8 24. Bxf6 gxf6 25. Ne4 Bg7 26. d4 f5 27. gxf5 exf5 28. N4g3 Nh4 |
| ECO A00 in 1989 play it! merten defeats white's grob henry in 66 moves | 1. b4 d5 2. Bb2 Bg4 3. Nf3 Nf6 4. e3 e6 5. a3 c5 6. b5 Nbd7 7. h3 Bh5 8. g4 Bg6 9. c4 h6 10. Nc3 Nb6 11. cxd5 Nfxd5 12. Ne5 Bh7 13. Bg2 Qc7 14. Nxd5 Nxd5 15. Rc1 b6 16. Qb3 Rd8 17. d4 Bd6 18. Nc6 Rd7 19. dxc5 Bxc5 20. Bxg7 Rg8 21. Be5 Bd6 22. Bb2 Bc5 23. Nd4 Qd6 24. Bxd5 Qxd5 25. Qxd5 Rxd5 26. Nc6 Rd7 27. Ne5 Rc7 28. Rd1 Be4 29. f3 Bc2 30. Rd2 Bxe3 31. Rd6 Bc5 32. Rd2 Ba4 33. Nc6 Be7 |
| ECO A00 in 1990 play it! merten defeats white's grob henry in 56 moves | 1. b4 d5 2. Bb2 Bg4 3. d4 Nf6 4. Nd2 e6 5. a3 a5 6. b5 a4 7. Ngf3 c6 8. Ne5 Bd6 9. Nxg4 Nxg4 10. e4 h5 11. e5 Bc7 12. Bd3 Qh4 13. g3 Qd8 14. h3 Nh6 15. Qxh5 Ba5 16. c3 Qb6 17. O-O c5 18. Nf3 Nd7 19. c4 O-O-O 20. Qg5 dxc4 21. Bxc4 Nf5 22. dxc5 Nxc5 23. Kg2 Kb8 24. Rad1 Rxd1 25. Rxd1 Ne4 26. Bd4 Nxd4 27. Qxg7 Rd8 28. Nxd4 Rxd4 |
| ECO A00 in 1988 play it! merten defeats white's grob henry in 50 moves | 1. b4 e5 2. Bb2 Bxb4 3. Bxe5 Nf6 4. a3 Be7 5. e3 c5 6. c4 Nc6 7. Bb2 O-O 8. Nf3 d5 9. d4 Re8 10. Be2 Bg4 11. Nbd2 dxc4 12. Nxc4 cxd4 13. Nxd4 Bxe2 14. Qxe2 Rc8 15. Rd1 Nxd4 16. Rxd4 Qc7 17. O-O b5 18. Nd2 Qc2 19. Rb1 a6 20. Qd1 Qxd1+ 21. Rxd1 Rc2 22. Rb1 Rec8 23. Rd3 a5 24. Nb3 a4 25. Nd4 Rxb2 |
| ECO A00 in 1992 play it! merten defeats white's gross david cze in 61 moves | 1. b4 d5 2. Bb2 Nf6 3. e3 Bf5 4. c4 dxc4 5. Bxc4 e6 6. Nf3 Nbd7 7. Nd4 Be4 8. Bxe6 fxe6 9. Nxe6 Qc8 10. Nc3 Bd3 11. Qb3 Nb6 12. Nf4 Bc4 13. Qc2 Bxb4 14. d3 Bf7 15. O-O O-O 16. Nb5 c6 17. Nd4 Nbd5 18. Nfe2 Bd6 19. a3 Ng4 20. h3 Ngf6 21. Rac1 Qd7 22. Qd2 Rad8 23. e4 Ne7 24. Nf3 Ng6 25. e5 Bxe5 26. Bxe5 Qxd3 27. Qxd3 Rxd3 28. Bxf6 gxf6 29. Rb1 b6 30. Ra1 Re8 31. Ng3 |
| ECO A00 in 1988 play it! merten defeats white's grob henry in 68 moves | 1. b4 Nf6 2. Bb2 a6 3. c4 e6 4. a3 c5 5. bxc5 Bxc5 6. d4 Be7 7. Nf3 d5 8. e3 O-O 9. Be2 dxc4 10. Bxc4 b5 11. Be2 Bb7 12. Nbd2 Nbd7 13. O-O Ne4 14. Nxe4 Bxe4 15. Bd3 Bg6 16. Qb3 Nb6 17. e4 Nc4 18. Rfe1 Nxb2 19. Qxb2 f6 20. Rac1 Rc8 21. Rc2 Rxc2 22. Bxc2 Qa5 23. Re3 Rc8 24. h3 Bf7 25. Bb3 Bxa3 26. Qa2 Rc1+ 27. Kh2 Bd6+ 28. e5 Qxa2 29. Bxa2 fxe5 30. dxe5 Bb8 31. Nd4 Kf8 32. Nxe6+ Bxe6 33. Bxe6 b4 34. Rf3+ Ke7 |
| ECO A00 in 1991 play it! merten defeats white's gross by checkmate in 60 moves | 1. b4 d5 2. Bb2 Bg4 3. h3 Bh5 4. Nf3 Nf6 5. e3 Nbd7 6. Be2 e6 7. a3 c5 8. bxc5 Bxc5 9. O-O Qb6 10. Ra2 O-O 11. d4 Be7 12. Nbd2 Rac8 13. c4 Qd8 14. cxd5 exd5 15. Ne5 Bxe2 16. Qxe2 Rc2 17. Qd3 Qc7 18. f4 Rc8 19. Nxd7 Nxd7 20. Nf3 Qb6 21. Rf2 R2c7 22. Ra1 Nf6 23. Rd1 Ne4 24. Re2 Qh6 25. Nd2 Ng3 26. Rf2 Bh4 27. Rf3 Rc2 28. Qb5 Qg6 29. Qxb7 Ne4 30. Nxe4 Qxg2# |
| ECO A00 in 1988 play it! merten defeats white's grob henry in 78 moves | 1. b4 e5 2. Bb2 Nf6 3. b5 d6 4. e3 Bf5 5. Nf3 Be7 6. Be2 O-O 7. Nc3 Nbd7 8. d3 Nb6 9. O-O Qd7 10. e4 Bg4 11. a4 c6 12. a5 Nc8 13. bxc6 Qxc6 14. h3 Bd7 15. Nd2 Be6 16. f4 exf4 17. Rxf4 Nd7 18. Nb3 Bf6 19. d4 Bxb3 20. cxb3 Ne7 21. Rc1 Qc7 22. Nd5 Qd8 23. Nxf6+ Nxf6 24. Qe1 Ng6 25. Rf5 Nxe4 26. Bf3 Nf6 27. Bxb7 Rb8 28. a6 Re8 29. Qg3 Ne4 30. Qd3 Nf6 31. Rcf1 Qb6 32. Kh1 Re7 33. d5 Ne5 34. Qg3 Ng6 35. Bxf6 gxf6 36. Rxf6 Rbe8 37. Qxd6 Qxb3 38. Qc6 Ne5 39. Qc1 Qg3 |
| ECO A00 in 1990 play it! merten defeats white's gross david cze in 46 moves | 1. b4 d5 2. Bb2 Bg4 3. h3 Bh5 4. Nf3 Nf6 5. e3 Nbd7 6. c4 e5 7. g4 Bg6 8. cxd5 Nxd5 9. a3 Bd6 10. Qb3 c6 11. Be2 O-O 12. Nc3 Nxc3 13. Qxc3 Re8 14. d4 exd4 15. Nxd4 Be5 16. f4 Qh4+ 17. Kd2 Bxd4 18. exd4 Nf6 19. Kd1 Ne4 20. Qe1 Nf2+ 21. Kd2 Bd3 22. Bxd3 Rxe1 23. Rhxe1 Qxh3 |
| ECO A00 in 1991 play it! merten defeats white's gross david cze in 62 moves | 1. b4 d5 2. Bb2 Bg4 3. h3 Bh5 4. Nf3 Nf6 5. e3 e6 6. b5 Nbd7 7. Be2 Be7 8. c4 c6 9. a4 O-O 10. Nc3 Nb6 11. Qb3 dxc4 12. Bxc4 Nxc4 13. Qxc4 Rc8 14. Nd4 c5 15. Nde2 Nd7 16. Nf4 Bg6 17. Nxg6 hxg6 18. Ne4 Nb6 19. Qc3 f6 20. h4 c4 21. h5 Qd5 22. Qc2 gxh5 23. Nc3 Qxg2 24. O-O-O f5 25. Rxh5 Bf6 26. Rdh1 Nd5 27. Nxd5 Bxb2+ 28. Qxb2 Qxd5 29. Rg1 c3 30. dxc3 Qd3 31. c4 Rxc4+ |