Solution
38. ♜e1 ♝f7 39. ♜e7 ♚g6 40. ♜xb7
The position
This advanced puzzle (rating 1957) 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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