Solution
37. ♜xd4 cxd4 38. ♚d5 ♚f6 39. g4
The position
This advanced puzzle (rating 1868) 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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