9/26/2023 0 Comments Xyz wing sudoku strategyThis one’s not too easy to use, but it precisely tells you what number a particular cell would hold. This way, you can eliminate candidates on the column except for the ones making a swordfish. Where the columns may contain more than three candidates, rows may not. But it’s a master technique for advanced puzzles. Swordfish is a complex version of X-Wing. ![]() X-Wing is a pattern spanning multiple columns and rows claiming the candidates to be eliminated from other relevant rows and columns. This technique works with cells forming a rectangle, and it also occurs in rare situations. If you use computer assistance to get a complete candidate listing for all cells, these are the ones with specific numbers hidden amongst other candidates for those cells. Instead of affecting cells of other rows, columns, and boxes, hidden subset impacts the pair/ triplet/ quad of the same subset. So if two cells have the same two candidates in a row, column or box, they can be excluded from the cells of another row, column, or box. You can quickly and efficiently spot naked subsets (pair/ triplet/ quad) when all the remaining candidates have been placed. This technique concerns the cells containing only a specific number of candidates. So if a particular digit can be placed in a said row, column, or box, it’s a perfect fit. It’s like when all possibilities are eliminated after scanning, only one choice remains, and that’ll be the correct value.įollowing Sudoku’s one rule where each box, row, and column must contain digits 1 to 9 without repetition, the single candidate/ hidden single applies. When all other digits, except the possible candidate, fall under the current row, column, or box, it’s a sole candidate (naked single). This happens when particular cells contain a single number. So, make use of these simple yet surefire strategies if you ever get stuck: You may succeed once, but it isn’t always the case. ![]() We know how it feels after making most moves by pure luck and not logic. This is an early 'ultimate puzzle' but this crown has been usurped by the puzzle created by Arto Inkala, which is also in the example list.If you’re one those players who hate guessing at Sudoku, try these Sudoku solving techniques instead. With the community's help I hope to extend the documentation here.įor those people wondering why " Escargot" cannot be solved by the solver, there is an article on this special Sudoku here. If you are interested in the concepts behind creation and grading, there is a PDF document here called Sudoku Creation and Grading. Many strategies can be further extended and we do not have a complete theory of all Sudoku puzzles. This strategy list is by no means complete. These are now included for the first time on this site. There are naturally special strategies for Jigsaw and Killers because of their differences. They are definitely worth presenting as a demonstration of people's ingenuity but you will only need to have recourse to them on the extreme puzzles. Do read the introductory articles Introducing Chains and Links and Weak and Strong Links.Įxotic strategies do overlap with chaining ones, but they have a peculiar flavour of their own and some wonderful, if obscure, logic. Thus, for example, Remote Pairs are a subset of XY-Chains that is, XY-Chains is a more general approach of which Remote Pairs are a specific instance. You will find, if you read through this group, that earlier strategies become part of a more general theory as the theme develops. This theme is all about bi-value (only two candidates left in the same cell) and bi-location (only two occurrences of a particular candidate left in the same unit) pairs and the incredible number of deductions one can make from them. ![]() With chaining strategies, there is definitely a theme going through them.
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