Solution
27… ♛f2+ 28. ♚d1 ♜d4+ 29. ♚c1 ♛d2+ 30. ♚b1 ♛d1#
The position
This advanced puzzle (rating 1834) asks Black to move to find the winning idea. It features these themes: Mate in 4.
It is Black to move. Look for the tactic hiding in the position — Mate in 4. 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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