Solution
56. ♜a2 ♚c1 57. ♜a1+ ♚b2 58. ♜xe1
The position
This advanced puzzle (rating 1821) asks White to move to find the winning idea. It features these themes: Skewer, Quiet Move.
It is White to move. Look for the tactic hiding in the position — Skewer, Quiet Move. 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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