Decoy (chess)

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This article uses algebraic notation to describe chess moves.
Image:chess zhor 26.png
Image:chess zver 26.png a8 b8 c8 rd d8 e8 rd f8 g8 kd h8 Image:chess zver 26.png
a7 b7 pd c7 d7 e7 f7 g7 bd h7 pd
a6 pd b6 c6 d6 pd e6 f6 qd g6 pd h6
a5 b5 nd c5 d5 pl e5 f5 g5 h5
a4 b4 c4 pl d4 e4 bl f4 g4 h4 pl
a3 b3 nl c3 d3 ql e3 f3 g3 h3
a2 pl b2 pl c2 d2 e2 rl f2 g2 h2
a1 b1 kl c1 d1 e1 f1 g1 h1 rl
Image:chess zhor 26.png
Honfi - Barczay, Kecskemet 1977.

In chess, decoying is the tactic of ensnaring a piece, usually the king or queen, by forcing it to move to a poisoned square with a sacrifice on that square.

The diagram on the right, with Black to play, illustrates two separate decoys. First, the White queen is set up on c4 for a knight fork: 1... Rxc4! 2. Qxc4. Next, the fork is executed by removing the sole defender of the a3 square: 2... Qxb2! 3. Rxb2 Na3+ 4. Kc1. Finally, a zwischenzug decoys the king to b2: 4... Bxb2+. After either 5. Kxb2 Nxc4+ 6. Kc3 Rxe4, or 5. Kd1 Nxc4, Black is two pawns ahead and should win comfortably.

Perhaps the most celebrated game featuring a decoy theme is Petrosian - Pachman, Bled 1961 (java interface), which also involved a queen sacrifice.

[edit] See also