Here is a nice chess position from the game Almasi-Babula, Dresden Chess Olympiad 2008. The Black Queen cannot leave the precious a4-e8 light-square diagonal because White has lined up a checkmate on d7. Can you use this hint to find White’s killer move?

35.Be2 is the magic move! Possible continuation could be 35. …Qc6 or Qa4 and both lose as White gets a piece for free. Run the full game in the applet and see the final continuation in the Houdini analysis after Black resigns on 35.Be2.

Almasi Zoltan (HUN) (2663) – Babula Vlastimil (CZE) (2608)

Result: 1-0
Site: Dresden (Germany)
Date: 2008.11.15
[…] 1.e4 c5 2.¤f3 d6 3.d4 cxd4 4.¤xd4 ¤f6 5.¤c3 e6 6.¥e3 ¥e7 7.g4 h5 8.gxh5 ¤xh5 9.£e2 a6 10.O-O-O b5 11.e5 d5 12.£g4 b4 13.¤ce2 £c7 14.f4 g6 15.¥g2 ¥d7 16.¢b1 ¤g7 17.h4 ¤c6 18.¦c1 ¤f5 19.¤xf5 gxf5 20.£g3 £a5 21.¤d4 ¢f8 22.¦cg1 ¦g8 23.£f2 ¤xd4 24.¥xd4 ¦c8 25.¥f3 ¦h8 26.£g2 ¢e8 27.h5 ¥f8 28.h6 ¦xh6 29.¦xh6 ¥xh6 30.£g8+ ¢e7 31.£h7 ¥f8 32.¥f2 ¢d8 33.£xf7 ¥c5 34.¦g7 £b5 35.¥e2 “Black resigns here because the Black Queen has to keep watch on the d7 square – all three possibilities of Qa4, Qb7, and Qc6 lose

(35…£b7 the worst choice 36.¥h4+ ¢c7 37.£xd7+ ¢b6 38.£xb7+ ¢a5 39.£xa6# (0:00:11) 35…Qb7)
(35…£c6 36.¥xc5 ¢c7 37.¥xb4 ¢b6 38.c3 and White is comfortably one piece up)
36.¥xc5 ¦xc5 37.£f8+ ¢c7 38.£xc5+ and White is one piece up