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### XYZ-Wing: Advanced Solving Sudoku Technique

XYZ-Wing:

Courtesy from http://www.sudokusnake.com/xyzwings.php

An XYZ-Wing is like an XY-Wing in that it is a group of three cells, one sharing a unit with the other two. However, the first cell in an XYZ-Wing has three candidates while the other two, called the wings, have two. Each of the wings must share one candidate with the first cell, (that's part of sharing a unit) but of different values. If the second candidates in the wings are both the same, and are also the same as the extra candidate in the first cell, then if any fourth cell shares that candidate and a unit with all three, that candidate can be eliminated.

Below is an example of using XY-Wing-RowBox(one case of XY-Wing in our Sudoku solver, explained after the example) to refine the candidate values of R3C6 (the highlighted square that is not circled in red). Blank/Empty Squares are marked with candidate values in red.

##### Solving Sudoku Methods Explained

This article answers questions: What are commonly used solving sudoku methods? What solving Sudoku methods do we use? In what sequences?

##### Basic Solving Sudoku Method: One Choice

a.k.a Sole Candidate, Only Candidate, or Naked Single

##### Basic Solving Sudoku Method: Elimination

a.k.a Hidden Single, Loner

##### Advanced Solving Sudoku Method: Subset2

a.k.a Pair, Naked Pair, or Naked Twins

##### Advanced Solving Sudoku Method: SubsetPosition2

a.k.a Hidden Pair or Hidden Twins

Last updated 3 mins ago

##### Advanced Solving Sudoku Method: Interaction

a.k.a Box/Row Claim or Intersection , or Locked Candidates

##### Solving Sudoku Methods Explained

This article answers questions: What are commonly used solving sudoku methods? What solving Sudoku methods do we use? In what sequences?