Chess

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All experienced human players know the right way to play against computers: you keep the game blocked and avoid all tactics. But putting this simple strategy into practice is not simple, particularly when a tempting chance to complicate comes along.

Jonathan Speelman fell into that trap as Black against "Kallisto" in the current Aegon Man vs Machine tournament in the Hague. From the diagram, Speelman continued 1...Nf7 inviting 2.Rxf7 Rxe2 3.Rxd4 when after 3...Qe5 Black threatened both Qxd4+ and Re1+. If White defends with 4.Re1, then 4...Qg3 wins. The machine, however, surprised him with 4.Rdxd7! Re1+ 5.Kf2!! when 5...Rxc1 6.Rxg7+ leaves Black the choice between 6...Qxg7 7.Rxg7+ Kxg7 8.Bxc1 and 6...Kh8 7.Rh7+ Kg8 8.Rdg7+ Kf8 9.Bxc1 winning easily for White in either case. Here are the full moves; at the end 42...Kc6 43.Rxg6+ is quickly fatal.

White: Kallisto

Black: Jonathan Speelman

1 e4 c6 22 Qc1 Rfe8

2 d4 d5 23 h4 h5

3 exd5 cxd5 24 f3 e5

4 c4 Nf6 25 dxe5 d4

5 Nc3 Nc6 26 Bg5 Bxe5

6 Nf3 a6 27 f4 Bg7

7 c5 Bg4 28 f5 Nce5

8 Be2 e6 29 fxg6 fxg6

9 h3 Bxf3 30 Rf1 Kh7

10 Bxf3 Be7 31 Rf4 Nf7

11 Na4 Nd7 32 Rxf7 Rxe2

12 0-0 0-0 33 Rxd4 Qe5

13 Rb1 b5 34 Rdxd7 Re1+

14 Nc3 Bg5 35 Kf2 Qe2+

15 Be3 b4 36 Kg3 Rxc1

16 Na4 Bf6 37 Rxg7+ Kh8

17 Qd2 g6 38 Rh7+ Kg8

18 Rfe1 Bg7 39 Rdg7+ Kf8

19 Rbd1 Qa5 40 Be7+ Ke8

20 b3 Rfc8 41 Rg8+ Kd7

21 Be2 Qc7 42 Bd8+ resigns

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