Solution
21. O-O-O c6 22. e4 ♝xc4 23. ♜xd8
The position
This advanced puzzle (rating 2026) 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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