Solution
48… ♚xc7 49. ♜e2 ♚xc6 50. ♜c2+ ♚d7
The position
This expert puzzle (rating 2338) asks Black to move to find the winning idea. It features these themes: Rook Endgame.
It is Black 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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