Solution
38. e8=♛ ♜d1+ 39. ♚f2 ♛d2+ 40. ♚g3
The position
This intermediate puzzle (rating 1583) 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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