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Undermining (also known asremoval of the guard, orremoving the defender) is achess tactic in which a defensive piece is captured, leaving one of the opponent's pieces undefended or under-defended. The opponent has the unpalatable choice of recapturing or saving the undefended piece. A possible response is to sacrifice the piece whose defense was undermined before capturing the piece which just took the defender.[2]
Kramnik–Topalov in the seventh round of the 2004Linares chess tournament reached the diagrammed position with White to play. The black knight on a4 is defended only by the black pawn on b5. White undermined the knight with1. Bxb5. The game continued1... Rxb5 2. Rxa4, with a netmaterial gain of a pawn for White.
Black may attempt 1...Nxb2?, disposing of the unguarded knight and hoping for 2.Kxb2 Rxb5+ to regain the lost pawn. After 2.Rb3, however, Black can only save the knight with 2...Rxb5 3.Rxb5, leaving White anexchange up instead of just a pawn.
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