Solution
28. ♜b3 a5 29. ♞c6+ ♚a8 30. ♞xe7
The position
This expert puzzle (rating 2318) asks White to move to find the winning idea. It features these themes: Pin.
It is White to move. Look for the tactic hiding in the position — Pin. 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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