Solution
15. ♛xa8 ♞xd5 16. O-O-O
The position
This expert puzzle (rating 2204) asks White to move to find the winning idea. It features these themes: Opening, Castling.
It is White to move. Look for the tactic hiding in the position — Opening, Castling. Drag a piece on the board to play your move; the puzzle will tell you if you found the best continuation.
Take 50,000 puzzles anywhere
Get Chess Puzzles Trainer for iPhone and iPad — the same puzzles, offline, with progress tracking and spaced repetition.