Solution
40… a2 41. ♜e1 ♞f3+ 42. ♚f1 ♞xe1 43. g8=♛ a1=♛
The position
This advanced puzzle (rating 2088) asks Black to move to find the winning idea. It features these themes: Promotion, Fork.
It is Black to move. Look for the tactic hiding in the position — Promotion, Fork. 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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