Solution
48. ♞xe4+ fxe4 49. ♚xe4 ♚e6 50. g4
The position
This intermediate puzzle (rating 1475) asks White to move to find the winning idea. It features these themes: Zugzwang.
It is White to move. Look for the tactic hiding in the position — Zugzwang. 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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