Solution
39. ♜e8 ♜g1+ 40. ♚h2 ♜7g2+ 41. ♚h3 ♜g6 42. ♜xf8+
The position
This intermediate puzzle (rating 1550) asks White to move to find the winning idea. It features these themes: Pin.
It is White to move. Look for the tactic hiding in the position — 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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