Solution
35. ♜b1 ♜c2 36. ♜b7 f4 37. ♜xa7
The position
This expert puzzle (rating 2496) 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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