A WXYZ-Wing is a Bent group of four cells with four candidates (naked), that have exactly one non-restricted common candidate, where the elimination cell(s) can see all occurrences of the non-restricted candidate in the group. In your Example #1, Cells A1-A3-B3-E1 form a WXYZ-Wing according to StrmCkr's more general definition (as you quote).

XYZ-Wings extend Y-Wings to three numbers and are three cell formations used to eliminate candidate elsewhere. They use a common candidate method to find contradictions.

A WXYZ-Wing is like an XY-Wing and an XYZ-Wing, except it is a group of four cells, one sharing a unit with the other three. The first cell in a WXYZ-Wing has three or four candidates while the other three, called the wings, have two each.

Mar 11, 2022 · You do not need to identify wxyz wings for easy or moderate sudoku puzzles, or even the hard ones found in New York Times or websudoku. But for very hard puzzles, also called evil or diabolical, wxyz wings are a powerful tool when …

XYZ-Wing. The XYZ-Wing is an enhanced version of an XY-Wing: Now the pivot contains not only candidates X and Y but Z as well. Consequently Z can only be eliminated from cells that see not only the pincers, but the pivot as well.

Sep 7, 2010 · The WXYZ-Wing is an extension of the XYZ-Wing, and is sometimes called XYZW-Wing. Seeing the extension of XYZ-Wing to WXYZ-Wing, one can further extend the technique to VWXYZ-Wing, UVWXYZ-Wing and so on.

The idea from the extended form of the WXYZ-Wing comes from the following observation: If the WZ is W, then the WXYZ (which becomes XYZ), XZ and YZ cells form a naked subset, and so Z can be eliminated from the starred cells.

In the example if candidate 9 were the solution in F7, then candidate 4 would be the solution in F6, 5 in E7, 8 in E9... and E5 would be empty. You can practice this strategy by installing the SudokuCoach application on your Android™ device.

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一、寻找 WXYZ-Wing 结构 〔一〕寻找 四值格. 这里选择第九宫b9中的r8c8（2359） 〔二〕在r8c8所在的宫寻找 双值格. 第九宫b9的双值格是r7c8（23），r9c7（35） 〔三〕在r8c8所在的行寻找双值格. 1、在r8c8所在的行r8一共有三个双值格