Friday, September 10, 2010

Sicilian Defense: Pin. Koch Variation

JONATHAN D TISDALL vs. GRAHAM LEE
London 1981

1. d4, e6
2. e4, c5
3. Nf3, cxd4
4. Nxd4, Nf6
5. Nc3, Bb4
6. e5 ....

The aggressive Pin. Koch Variation. White gives up some pieces in exchange for an attack on Black's King side.

6. .... Ne4
7. Qg4, Nxc3
8. Qxg7, Rf8
9. a3, Nb5+
10. axb4, Nxd4
11. Bd3, Qb6
12. Bg5, Nf5
13. Bxf5, exf5
14. 0-0-0, Qg6
15. e6 ....

The Queen could not be taken. If 15....Qxg7, then 16. exd7+ Bxd7 (or Nxd7), 17. Rhe1+ Be6, 19. Rd8 mate.

15. .... d5
16. Rxd5 ....

Threatening Rd8+ mate.

16. .... Nc6
17. e7, Nxe7

White's Queen is still invulnerable because of the threat 18. Rd8+ Nxd8, 19. exd8=Q+ mate.

18. Rd8+, Resigns

If 18....Kxd8, then 19. Qxf8+ Kc7, 20. Qxe7+ Bd7 (Not Kb6, 21. Qc5+ Ka6, 22. Qa5+ mate.), 21. Bf4+ Kb6, 22. Qc5+ with the same mating attack.

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