Solution
46. ♞d8+ ♚e8 47. ♞c6 ♝f4 48. a6 ♚d7 49. a7 ♚xc6 50. a8=♛+
The position
This advanced puzzle (rating 2094) 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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