Solution
57. ♞d4+ ♚d7 58. ♞xe6 ♚xe6 59. ♚xb5 ♚d7 60. ♚b6 ♚c8 61. ♚c6
The position
This intermediate puzzle (rating 1622) asks White to move to find the winning idea. It features these themes: Fork.
It is White to move. Look for the tactic hiding in the position — Fork. 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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