Game technique · Sudoku
Skyscraper in Sudoku
Two strong links for one digit share an aligned end; at least one of their unaligned ends must be true.
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Two strong links for one digit share an aligned end; at least one of their unaligned ends must be true.
Example
Remove the digit from any cell that sees both unaligned ends.
Video guide
Key point
Two strong links for one digit share an aligned end; at least one of their unaligned ends must be true.