Solution
18. h4+ ♚g4 19. f3+ ♝xf3 20. gxf3+ ♚h3 21. ♝f2
The position
This expert puzzle (rating 2400) asks White to move to find the winning idea. It features these themes: Middlegame.
It is White to move. Look for the tactic hiding in the position — Middlegame. 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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