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a b c d e f g h
8 a8 b8 c8 d8 e8 r f8 g8 k h8 8
7 a7 b7 c7 p d7 B~ e7 f7 g7 p h7 p 7
6 a6 b6 c6 q d6 e6 f6 p g6 h6 6
5 a5 b b5 c5 d5 e5 p f5 g5 h5 5
4 a4 b4 p c4 P d4 e4 N f4 g4 h4 4
3 a3 b3 c3 d3 e3 f3 P g3 Q h3 ~~ 3
2 a2 r b2 P c2 P d2 e2 f2 g2 P h2 P 2
1 a1 b1 c1 d1 e1 f1 g1 R h1 K 1
a b c d e f g h
If black accepts the "sacrifice", then the knight can abuse the queen's new position by forking. 1.Bd2 Qxd2 2.Nxf3+ (1...Qa1?! 2.Nxf3+ Kh1 3. Nxe1 Qa3?? 4.Qxg2#)

A decoy is a sacrifice used to attract a piece, usually a king or queen, to a square where its position can be abused.

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