Solution
84. gxf5 g4 85. f6 g3 86. f7 g2 87. f8=♛
The position
This beginner puzzle (rating 861) 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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