Solution
55. f7 d2 56. ♚c2 ♞xf7 57. ♞xf7 d1=♛+ 58. ♚xd1
The position
This advanced puzzle (rating 2027) asks White to move to find the winning idea. It features these themes: Knight Endgame.
It is White to move. Look for the tactic hiding in the position — 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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