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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.

## 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

 A1 A2 A3 A4 A5 A6 A7 A8 A9 B1 B2 B3 B4 B5 B6 B7 B8 B9 C1 C2 C3 C4 C5 C6 C7 C8 C9 D1 D2 D3 D4 D5 D6 D7 D8 D9 E1 E2 E3 E4 E5 E6 E7 E8 E9 F1 F2 F3 F4 F5 F6 F7 F8 F9 G1 G2 G3 G4 G5 G6 G7 G8 G9 H1 H2 H3 H4 H5 H6 H7 H8 H9 I1 I2 I3 I4 I5 I6 I7 I8 I9