![]() ![]() ![]() The other possible cells involved are R3C1, R7C2, R8C2 and R9C2 but none of them have a "3" as candidate. Guides Sudoku Box/Line Reduction Intersection Removal Strategy Pointing Pairs, Pointing Triples, Intersection Removal Strategy X-Wing Strategy Box/Line Reduction Intersection Removal Strategy Intersection removal is a strategy where you can eliminiate one candidate from a cell or cells. You can eliminate candidate "3" (Z) from all cells seen simultaneously by both pincers, in this case R2C1. The pincers are the green cells: R3C2 (93 or YZ) and R7C1 (37 or ZX). You can use Y-Wing if each of the two candidates in the pivot forms a conjugate pair in two different units. The red square in the above image is the pivot. This square is sometimes called a pivot or hinge. Contents Y-Wing starts with a square that contains exactly two candidates. In Nice Loop notation, you must include the cell(s) with the eliminated candidates to complete the loop: This may seem obvious to you, but some folks don’t do this It’s possible for adept players to solve easier sudokus with pen, but for harder puzzles it’s going to help a lot if you use pencil. Y-Wing is a strategy that allows you to eliminate candidates. You can write it like this in Eureka notation: Chain NotationĪn XY-Wing is a short chain. Solving Techniques / Y-wing Y-wing Index Sudoku is a popular logic-based puzzle that challenges players to fill in a 9x9 grid with the numbers 1-9, with each row, column, and 3x3 sub-grid containing each number exactly once. ![]() One of the pincers shares a row with the pivot, the other shares a column. While solving the sudoku puzzle you can only use each number one time in the square, column, and row. Up to 5 eliminations are possible in this formation. The objective of Sudoku is to fill a 9x9 grid made of squares (shown above circled in blue) so that each row, each column, and each full 9x9 square use the numbers 1-9. 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. On the left: Pivot r7c2, pincers r2c2 and r7c1. Consequently Z can only be eliminated from cells that see not only the pincers, but the pivot as well. The chain uses only 3 digits, symbolically named X, Y and Z. 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. The cell in the center is called the pivot. An XY-Wing is a solving technique that uses a short chain of 3 cells. Y-Wing is a strategy that allows you to eliminate candidates. ![]()
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