Solution
27… ♜8d3+ 28. ♚h2 ♜xh3+ 29. ♚g1 ♜g3 30. ♝d5 f6
The position
This expert puzzle (rating 2234) asks Black to move to find the winning idea. It features these themes: Pin.
It is Black 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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