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Remote Pairs
A chain of cells all holding the same pair {X,Y}, each seeing the next. The colours alternate X/Y, so any cell seeing both colours sees both an X and a Y — and loses both digits.
There's a move in the grid.
A chain of cells all holding the same pair {X,Y}, each seeing the next. The colours alternate X/Y, so any cell seeing both colours sees both an X and a Y — and loses both digits.
There's a move in the grid.