Solution
42. ♚xb2 g4 43. f4 ♚e4 44. ♚c3
The position
This intermediate puzzle (rating 1682) asks White to move to find the winning idea. It features these themes: Zugzwang, Quiet Move.
It is White to move. Look for the tactic hiding in the position — Zugzwang, 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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