Solution
37. ♜f8+ ♞g8 38. ♜xg8+ ♚xg8 39. ♝a2 ♚f8 40. ♝xc4
The position
This advanced puzzle (rating 1850) asks White to move to find the winning idea. It features these themes: Sacrifice, Pin.
It is White to move. Look for the tactic hiding in the position — Sacrifice, Pin. 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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