X-Wing |
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| X-Wing | |
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In the puzzle below, we have an example of the X-Wing technique. The yellow cells indicate the X-Wing.
Cells A and B share the same row. Since these are the only cells which can contain a 3, either cell A or cell B
must be a 3. Cells C and D also share the same row. These cells are the only ones which can contain a 3. So either cell
C or D must contain a 3. Because cell A and C and cell B and D share the same column, we can use this information to
exclude certain candidate values. When cell A contains a 3, cells B and C cannot and cell D must be a 3. When cell B contains a 3, cells A and D cannot and cell C must be a 3. We can simplify this by saying that when cell A is a 3, cell D must be the other 3. The same goes for cell B and C. We do not know which is a 3, but we do know that other cells that share the same columns cannot be a 3. In the example below, we can exclude the candidate value 3 from the blue cells. |
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