Solution
47. ♜xc4+ bxc4 48. a7 c3 49. a8=♛ c2 50. ♛a7+
The position
This expert puzzle (rating 2351) asks White to move to find the winning idea. It features these themes: Promotion, Sacrifice.
It is White to move. Look for the tactic hiding in the position — Promotion, Sacrifice. 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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