Solution
56. ♞d3+ ♚d4 57. ♞xb2 e2 58. b8=♛
The position
This intermediate puzzle (rating 1406) asks White to move to find the winning idea. It features these themes: Promotion, Fork.
It is White to move. Look for the tactic hiding in the position — Promotion, 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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