Solution
51… a3 52. f6 ♚d6 53. f7 ♚e7 54. f8=♜ ♚xf8
The position
This advanced puzzle (rating 1979) asks Black to move to find the winning idea. It features these themes: Pawn Endgame.
It is Black to move. Look for the tactic hiding in the position — Pawn 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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