Solution
66. ♜c7+ ♚d6 67. ♜c6+ ♚d7 68. ♜xg6
The position
This intermediate puzzle (rating 1657) asks White to move to find the winning idea. It features these themes: Skewer, Rook Endgame.
It is White to move. Look for the tactic hiding in the position — Skewer, Rook Endgame. 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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