Solution
55… ♜b7+ 56. ♚a4 ♜b1 57. ♜c1 ♜xc1
The position
This advanced puzzle (rating 1854) 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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