Solution
19. ♝xa5 ♜xa5 20. ♚xc2 ♜c5+ 21. ♚b1
The position
This advanced puzzle (rating 1872) asks White to move to find the winning idea. It features these themes: Middlegame.
It is White to move. Look for the tactic hiding in the position — Middlegame. 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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