![]() ![]() The cell in the center is called the pivot. The other possible cells involved are R3C1, R7C2, R8C2 and R9C2 but none of them have a "3" as candidate. An XY-Wing is a solving technique that uses a short chain of 3 cells. You can eliminate candidate "3" (Z) from all cells seen simultaneously by both pincers, in this case R2C1. The name derives from the fact that it looks like an X-Wing - but with three corners, not four. The pincers are the green cells: R3C2 (93 or YZ) and R7C1 (37 or ZX). 27,317 views 365 Dislike Share Cracking The Cryptic 471K subscribers Simon takes a look at last Friday's Diabolical-rated Sudoku for The Daily Telegraph (28 Dec 18). Y-Wing Strategy: This is an excellent candidate eliminator (and is also known as XY-Wing). You can ignore the 3x3 blocks as they aren't involved. In Nice Loop notation, you must include the cell(s) with the eliminated candidates to complete the loop: '-wing' is an advanced Sudoku technique, which is based on two parallel rows or columns. You can write it like this in Eureka notation: ![]() Chain NotationĪn XY-Wing is a short chain. One of the pincers shares a row with the pivot, the other shares a column. ![]() Up to 5 eliminations are possible in this formation. One of the pincers shares a row or column with the pivot, the other shares a box. SubtypesĪlthough the logic behind the XY-Wing is always the same, subtypes have been introduced to help players to recognize these patterns more easily. The pincers have candidates XZ and YZ.Īny cell that can see both pincers can not longer contain a candidate for digit Z, because the pivot forces either of the pincers to contain this digit. The pivot contains candidates XY, which explains the name of this technique. The chain uses only 3 digits, symbolically named X, Y and Z. In this series, you will learn to love solving Sudoku In this fifth video of the series, I teach the Y-Wing and XYZ-Wing techniques, and then solve a Sudoku. This square is sometimes called a pivot or hinge. Contents Y-Wing starts with a square that contains exactly two candidates. It is also confusingly known as the X-Y Wing even though it has nothing to do with X Wings. The Hook rule is a last ditch attack for hard puzzles. The cell in the center is called the pivot. Y-Wing is a strategy that allows you to eliminate candidates. First step of 22 steps As a last resort for solving really difficult puzzles, when you have tried everything else, the Hook (or X-Y Wing) may come to the rescue. An XY-Wing is a solving technique that uses a short chain of 3 cells. sudokumaniacs YWing classicsudokuA place where you learn to solve sudokus and videos detailing how to approach different variations of Sudoku. ![]()
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