Candidate 5 determines the 'wing' cells in yellow and one or other of those 5s must be true. Most of the time you won't. This idea could be extended to form any N-wing format, but the logistics are astronomical. Thank you for your interest. W-Wings are easy to spot and often very efficient.

• Sudoku Snake Solving Technique XY Wings
• SudoCue Sudoku Solving Guide
• HoDoKu Solving Techniques Wings (XYWing, XYZWing, WWing)
• Sudoku Directions

• That having been said, XY-Wing is not easy to find. In order to follow what is explained below, it is important to first understand the concept of Intersection.

## Sudoku Snake Solving Technique XY Wings

XY Wings. An XY-Wing is a group of three cells, one sharing a unit with the other two, each having only 2 candidates. Consider the example on this page. Please enjoy the journey as we tackle an extreme Sudoku puzzle! Puzzle #23 will require Step 4: XY-Wings & XYZ Wings – December, Steps are relatively common techniques and are explained in the TI LIFE articles per above.

Steps are covered in detail, in Dan's book. Also see Sudoku.
Here is the first of the later. Five candidates can be eliminated.

Video: Sudoku xy wing examples of cover Sudoku Tutorial #23 / XY-Wing

Most of the time you won't. So regardless of which yellow cell is a 4, C7R2 is not a 4.

The easy principle is that each possible value of the hinge cell results in a Z value in one of the cells in the WXYZ-Wing pattern, thus leaving no room for a Z on any cell all four can 'see'. You later make the clarification when you state "We are looking for a 9 elsewhere that can see every 9 in the four cells".

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However, I met an exception. Cell r1c6 shares row 1 with the pivot and contains candidates 5 X and 2 Zcell r2c1 shares box 1 with the pivot and contains candidates 7 Y and 2 Z. The easy principle is that each possible value of the hinge cell results in a Z value in one of the cells in the WXYZ-Wing pattern, thus leaving no room for a Z on any cell all four can 'see'.

That makes it the only non-restricted candidate.

### SudoCue Sudoku Solving Guide

Tuesday Apr

WXYZ-Wings extend XYZ-Wings to four numbers and are four cell formations i have covered more extensively the idea of bent quads on numerous. I don't have an example sudoku for this, but consider the given example.

This page will not only introduce Y wings, also called xy wings, but also generalize. be solved using Y wings plus perhaps techniques covered in previous blog pages.

## HoDoKu Solving Techniques Wings (XYWing, XYZWing, WWing)

I find your '5-bullet' analysis of the Y-wing example a little too heavy. This is the Sudoku solving guide, teaching you a wide range of Sudoku solving techniques with practical examples and illustrations. Empty Rectangle or Hinge ; Remote Pair; Finned Fish; XY-Wing; XYZ-Wing; Aligned the remaining candidates, you are allowed to remove all digits not covered by a line.
Do you tackle a Sudoku on your cottage veranda, sailboat cockpit, or at a campsite?

Video: Sudoku xy wing examples of cover The XY Wing Part 1 Tutorial #43

This is from your Sunday daily puzzle of a Sudoku from early September. We know for sure that one of the two yellow cells is a 4.

## Sudoku Directions

But how could I ever find a situation like this? The other rules stay intact. You have just solved the puzzle.

 Dutchman campers 5th wheel It cannot contain 2 Z. Previously I'd restricted the scope to a very narrow definition. Well, a restricted digit is one where all the instances of candidate N in the pattern can see each other.Please enjoy the journey as we tackle an extreme Sudoku puzzle! The theory is that if C8R8 had only options 12, there would eventually be two valid solutions to the puzzle. You could expand it to a five cell pattern and five numbers.