Solution
40… ♜xg3+ 41. fxg3 d2 42. ♜h7 d1=♛
The position
This advanced puzzle (rating 1900) asks Black to move to find the winning idea. It features these themes: Promotion, Sacrifice.
It is Black to move. Look for the tactic hiding in the position — Promotion, Sacrifice. 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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