Solution
55. ♚e8 ♛c5 56. f8=♛
The position
This expert puzzle (rating 2260) asks White to move to find the winning idea. It features these themes: Promotion, Clearance.
It is White to move. Look for the tactic hiding in the position — Promotion, Clearance. 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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