Solution
39. ♜xg5+ fxg5 40. ♚f5 g4 41. ♚xg4
The position
This advanced puzzle (rating 1823) asks White to move to find the winning idea. It features these themes: Rook Endgame.
It is White to move. Look for the tactic hiding in the position — Rook Endgame. 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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