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a b c d e f g h
8 a8 b8 c8 d8 e8 f8 q g8 k h8 8
7 a7 b7 b c7 d7 e7 f7 p g7 p h7 p 7
6 a6 b6 c6 d6 e6 f6 g6 h6 6
5 a5 b5 c5 Q d5 e5 f5 g5 h5 5
4 a4 p b4 P c4 d4 e4 f4 g4 h4 4
3 a3 b3 c3 d3 B e3 f3 g3 P h3 3
2 a2 b2 c2 d2 e2 f2 P g2 h2 P 2
1 a1 b1 c1 d1 e1 f1 g1 K h1 1
a b c d e f g h
1...Bxh7+!! Kxh7 2.Qxf8 is a sequence of moves that sacrifices a bishop to force black's king away from the queen.

To undermine is to oust a piece's defender by attacking it and forcing it to evade.

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