Solution
40. ♜xb7 ♚xb7 41. ♚b3 a5 42. ♚c4 ♚c6 43. ♚xd4
The position
This easy puzzle (rating 1386) 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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