Solution
18. ♜fe1 ♛d5 19. ♜xe7 ♛xb3 20. axb3
The position
This intermediate puzzle (rating 1778) asks White to move to find the winning idea. It features these themes: Middlegame, Pin.
It is White to move. Look for the tactic hiding in the position — Middlegame, 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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