Jyrki Heikkinen (1880) - Andreas Walkenhorst (2000)
Diemer-Duhm Gambit, casual e-mail game 1996-1997

1. e4 e6 2. d4 d5 3. c4 dxe4 4. Nc3 Nf6 5. f3 Bb4 6. Qa4+

Thanks to this game, I have started to play 6. Be3, intending Qc2 and O-O-O.

6... Nc6 7. a3 Bxc3+ 8. bxc3 O-O 9. Bg5 h6 10. Bh4

10. h4? hxg5 11. hxg5 Nd7 12. f4 f6! 13 g6 Qe8 -+.

10... exf3

AW: "I must admit that I would never play this in a tournament game. But it looks entertaining."

11. Nxf3 e5

11... g5 12. Nxg5?! hxg5 13. Bxg5 Kg7 14. Bd3 Qd6 -/+.

12. O-O-O

12. d5 e4 13. O-O-O exf3 (13... Ne7) 14. dxc6 fxg2? 15. Bxg2 Qe8 16. cxb7 +/-.

12... e4

12... exd4 13. cxd4 Bg4 14. Bd3 looks promising for White.

13. Ne5

13. Nd2 Re8 14. Be2 or 14. d5?! e3 -/+.

13... Ne7

Other moves are worse, leading to unclear positions:

• 13... Qe8!? 14. Bxf6 gxf6 15. Nxc6 Bd7 16. Qc2 Bxc6 17. Qf2 e3? 18. Qg3+ Kh8 19. Bd3.
• 13... Nxe5 14. dxe5 Qe8 15. Qxe8 Nxe8 16. Be7.

14. Be2

• 14. c5!? Nf5 15. Bf2 Ng4!? 16. Nxg4 Qg5+.
• 14. Bxf6?? gxf6, and the knight on e5 is lost.

14... Nf5

14... g5!? 15. Bg3 Nh7 with the idea f6, f5, f4.

15. Bf2

15. Bg3 Ne3 16. Rdg1 c5 -/+, especially 17. dxc5?? Qe7 would lose the knight on e5.

15... Nd7

15... e3? 16. Bg1 threatening g4 and Bxe3.

16. g4

16. Qc2 Nxe5 17. dxe5 Qe7 -/+.

16... Qg5+ 17. Kb1 Nxe5

• 17... Ne3 18. Nxd7 Nxd1 19. Rxd1 b5 20. Qxb5 Qxb5+ 21. cxb5 Bxd7 =/+, with the idea h5 and f5.
• 17... b5! 18. cxb5 Ne3.

18. dxe5

18. gxf5 Qxf5 -/+.

e3 19. Be1

19. Bg1 Ne7

• 20. Qb5 Bxg4 21. h4 Bf5+ 22. Bd3 e2 -+.
• 20. Rd3 Bxg4 21. Rxd3 Bf5+ 22. Ka1 Qg2 23. Bf3 Qf1+ -+.

19... Ne7 20. Bg3

20. Rg1!? Qxe5 21. Bg3 (21. Rg3 f5 -+) Qxc3 22. Rd3 Qf6 23. Rxe3 Qb6+ -+.

20... Bxg4 21. Bxg4 Qxg4 22. Qd7 Nf5

22... Qxd7 23. Rxd7 Ng6 24. Rxc7 b6 intending Rac8 =/+.

23. Rhg1 e2 24. Rde1 Rfd8 25. Qxc7 Qe4+ 26. Ka1 Qc2 0-1

There is nothing against 27... Rd2 or Rd1.

PGN version.