Solution
57… b3+ 58. ♚b1 bxa2+ 59. ♚xa2 ♚d4 60. ♚b2 ♚d3 61. ♚c1 ♚c3
The position
This advanced puzzle (rating 1898) asks Black to move to find the winning idea. It features these themes: Fork, Knight Endgame.
It is Black to move. Look for the tactic hiding in the position — Fork, Knight 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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