Solution
40… ♞h4 41. ♛f1 ♞f3+ 42. ♚g3 ♞d2
The position
This expert puzzle (rating 2405) asks Black to move to find the winning idea. It features these themes: Quiet Move.
It is Black to move. Look for the tactic hiding in the position — Quiet Move. Drag a piece on the board to play your move; the puzzle will tell you if you found the best continuation.
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