Jyrki Heikkinen - GNU WebChess

Diemer-Duhm Gambit, Helsinki 1995

1. e4 e6 2. d4 d5 3. c4 dxe4 4. Nc3 Nc6 5. Be3

5. f3 Qxd4 6. Bd2? Bc5 (6. -e3!) 7. Qe2 Nb4 8. O-O-O Nd3+ 9. Kb1 Nf2 10. Nb5 Qd3+ 11. Qxd3 exd3 12. Nxc7+ Ke7 13. Nxa8 Nxh1 14. Nh3 Nf6 15. Bxd3 Nf2 16. Nxf2 Bxf2 17. Nc7 Rd8 18. Bb4+ Kd7 19. Nb5 Kc6 20. Be4+ Nxe4 21. Rxd8 Bd7 22. fxe4 a6 23. Nd6 Bc5 24. Bxc5 Kxc5 25. Nxf7 Bc6 26. Ng5 Kxc4 27. Nxe6 Bxe4+ 28. Kc1 Bxg2 29. Nxg7 1-0, Bronstring - van Dijk, 1994.

5. -Nf6

5. -Bb4 6. Qb3 Nf6

7. O-O-O Qe7 8. Nb1 Na5 9. Qc2 c5 10. a3 cxd4 11. axb4 Qxb4 12. Rxd4 Nb3+ 13. Kd1 Nxd4 14. Bxd4, Diemer - Werner, 1950.
7. f3 O-O 8. O-O-O Bxc3 9. Qxc3 Qe7 10. a3 a6 11. Qc2 Bd7 12. fxe4 Rfb8 13. Nf3 b5 14. Ng5 (14. e5!) h6 15. h4 e5, Markwardt - Schulz, 1956.

6. h3

A naive fear was 6. f3 exf3 7. Nxf3 Ng4?!.

6. -Bb4 7. a3 Bxc3+ 8. bxc3 h6?

Even computers have suicidal tendencies.

9. f3 O-O 10. Qc2 exf3 11. Nxf3 Bd7

11. -e5!? 12. dxe5 (12. d5 e4 13. Nd2 Ne5) Qe7 13. Bd4 Nd7 14. Qe4 f5! 15. Qe3 Rfe8 -+.

12. Bd3 Qe7 13. O-O Rfd8

14. Qd2

What on earth might the Queen do here...

14. -Na5

14. -e5 15. Bxh6 e4 16. Rae1 +-, but not 16. Qg5?! Qf8 winning a piece with unclear game. 14. -Qf8 15. Ne5 Nxe5 16. dxe5 Ne8 17. Bg6!? +-.

15. Bxh6! Kf8

15. -gxh6 16. Qxh6 and Ng5.
15. -Nb3 16. Qg5 Qf8 17. Rb1 Na5 18. Ne5 1-0.
15. -Ne8 16. Bg5 Nf6 (16. -f6 17. Ne5! fxg5 18. Ng6 Qd6 19. c5) 17. Ne5 Nb3 18. Qf4 Nxa1 19. Qh4 1-0.

16. Ne5

16. Bxg7+ Kxg7 17. Qg5+ Kf8 18. Ne5 wins easily.

16. -Nb3 17. Qg5 gxh6

17. -Ne8?? 18. Ng6+.

18. Qxh6+ Ke8 19. Rxf6 Nxa1 20. Rxf7 Qxf7 21. Bg6

21. Nxf7 Kxf7 22. Bg6+ Kf6 (22. -Ke7 23. Qg5+) 23. Bh5+ Kf5 24. Qg5+ Kf4 25. Kf2 and 26. g3#.

21. -Qxg6 22. Qxg6+ Ke7 23. Qf7+ Kd6 24. c5+ Kd5 25. Qf3#

PGN version.