Kort, Jacob - Tomson, J. B.
E25       Student Olympiad, Harrachov, Final-B (6)       1967

1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. f3 d5 5. a3 Bxc3+ 6. bxc3 c5 7. cxd5 Nxd5 8. dxc5 Qa5 9. e4 Qxc3+?!

Better 9... Ne7 .

10. Bd2 Qe5 11. Ne2 Nf6?

Now 11... Ne7 , covering c8, was essential. Tomson’s move allows 12. Bc3, after which 12. ... Qxc5? fails to 13. Rc1. So 12. ... Qc7, and then after 13. Qd6 White stands clearly better.

12. Bf4? Qxc5 13. Bd6 Qa5+ 14. Kf2 Qb6+ 15. Kg3??

A severe case of over-optimism. At this point the computer starts straining at the leash, urging 15. ... Nxe4+ with great and increasing insistence. After 16. fxe4 Qe3+ 17. Kh4 g5+ 18. Kh5 Qxe4 White can only avoid mate by giving up large amounts of material, with an easily won game for Black. Tomson misses the chance, perhaps thinking the text came to the same thing ...

15... Qe3? 16. Qd4 Nh5+ 17. Kh4 Qh6 18. g4??

... and as it happens he’s right. But White could have escaped with 18. Qc5 Nc6 (nothing more direct seems available) 19. Qg5. He may have wanted to avoid playing the pawn-down ending, but instead allows a mate in three.

18... g5+ 19. Kh3 Nf4+

0-1