Solution
21. ♝xc5 ♛xc5 22. ♞d6+ ♚c7 23. O-O
The position
This expert puzzle (rating 2228) asks White to move to find the winning idea. It features these themes: Middlegame, Castling.
It is White to move. Look for the tactic hiding in the position — Middlegame, Castling. 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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