Sudoku Tutorial | |
X Chain |
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An X chain follows a single
candidate (2 in this example). The chain is a sequence of links between cells where:
be a 2. This will eliminate the slashed 2's. (It is possible that both ends of the chain are 2's) In this example, all of the links are strong links except in column 1. Here is another examples of an X chains X Chain #2 X Chain #3 |