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Solving Techniques 6
Y-Wing

This is a Y-wing. There is a [12] in the upper left cell, highlighted in red.

If a 1 goes here, the [13] on the lower right cell becomes a [3]. The X’s indicate the where the 3 can’t go.

If there is a [2] in this cell, the [23] to its right becomes a [3]. The X’s indicate the where the 3 can’t go.

In the overlapping areas, B4, 5 and 6, a 3 can’t be entered (the cells with X’s), hence a 3 can be eliminated as a candidate number.

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Other Y-wing patterns

The pattern below is also an XY-wing.

There are two numbers in the cells serving as starting points. Look for the cells with two numbers in them, that will be affected by the first set of cells. Finally, look for where these two cells intersect.

It seems like this would occur often, but the cells that meet the criteria are not that common. So unless you make a conscious effort to use this technique, it can happen that you solve the problem using a different method.
This technique is worth remembering, since it can be useful when trying to solve the puzzle quickly.

Names of cells in Sudoku

A1A2A3A4A5A6A7A8A9
B1B2B3B4B5B6B7B8B9
C1C2C3C4C5C6C7C8C9
D1D2D3D4D5D6D7D8D9
E1E2E3E4E5E6E7E8E9
F1F2F3F4F5F6F7F8F9
G1G2G3G4G5G6G7G8G9
H1H2H3H4H5H6H7H8H9
I1I2I3I4I5I6I7I8I9

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