Solution
73. a8=♛+ ♚xc5 74. ♛xf3
The position
This beginner puzzle (rating 855) asks White to move to find the winning idea. It features these themes: Skewer, Promotion.
It is White to move. Look for the tactic hiding in the position — Skewer, 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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