Solution
44. a8=♛ ♜xa8 45. ♝xa8 c2 46. ♚d2 c1=♛+ 47. ♚xc1
The position
This intermediate puzzle (rating 1480) asks White to move to find the winning idea. It features these themes: Promotion.
It is White to move. Look for the tactic hiding in the position — Promotion. 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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