Solution
50. ♚xd4 a3 51. ♚c3 a2 52. ♚b2 a1=♜ 53. ♚xa1
The position
This easy puzzle (rating 1315) asks White to move to find the winning idea. It features these themes: Tactics.
It is White to move. Look for the tactic hiding in the position — Tactics. 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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