Solution
50… exf3 51. ♚e3 f2 52. ♚xf2 ♚e4 53. ♚g3 ♚e3
The position
This expert puzzle (rating 2379) 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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