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X Wing

Medium

An X-Wing can be found when two match up perfectly in parallel . We can then safely remove candidates in the opposite lines.

How it works

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Find the first Row or Column

This Row has a . Digit 1 appears in exactly two cells.

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Find the matching Row

This Row also has 1 in exactly two cells and in the same Columns.

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Only 1s in each Row

These are the only four Cells that can be 1 in both Rows.

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Notice the relationship

If this Cell is 1, then the opposite Cell must be 1.

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And vice versa

If this Cell is 1, then the opposite Cell must be 1.

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1
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1
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There's only two outcomes

In each Row, one of these Cells is 1. The opposite Cell will be 1 too. With this relationship, no other Cell in either Column can possiblly be 1.

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7
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Eliminate other cells

We can safely remove 1 from any other Cell in those two Columns.

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the X Wing on your board.

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