Solution
53. g7 ♜g4 54. ♜f8+ ♚e7 55. g8=♛ ♜xg8 56. ♜xg8
The position
This intermediate puzzle (rating 1426) asks White to move to find the winning idea. It features these themes: Promotion.
It is White to move. Look for the tactic hiding in the position — Promotion. 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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