I hope this is helpful, if you have further questions, please ask. It requires the use of pencil marks and cross referencing several cells. Welcome to this new video, explaining the X-Wing technique that can be used to make progress with solving sudoku puzzles. Obviously 5 is in all rows except maybe in J.Ĭhecking 5 in J: If 5 not in J then J1234=1234, which implies H1 GHJ7=1249ĥ not in GHJ6 => GHJ6 5 in col 6 => 5 in AB6 You may get half way through a puzzle before you realize that a mistake was made somewhere. Guessing will most often lead you down the wrong road. Applying logical reasoning rather than guessing will assure you a solution with greater satisfaction. Single's Chains also related to X-Cycles. It is best to approach solving a Sudoku puzzle in a systematic way. 'Simple' refers to the idea that one candidate number is considered - in contrast to 'multi-colouring' which is the basis of 3D Medusa. In the example on the right row 4 and column 5 form the ER, r7c59 is the conjugate pair, and r4c9 can be eliminated. Single's Chains, also known as Simple Colouring is a chaining strategy and part of a large family of such strategies. However I'd like to point out setti 5, which you can use after the first 4 solved cells and which is really helpful: The equivalent Finned Mutant X-Wing: 9 c2b5 r4c6 fr8c2 > r8c6<>9.These cells are extremely useful and will play a huge part in most chaining strategies. I tried to write down all steps for you in detail but it quickly got too much. bi-value links In the next diagram I have picked a random Sudoku from my solver examples and highlighted all the cells with two remaining candidates. We solved it without chain and started with a different strategy than Aubinger (whose beginning I find really elegant!). If you can find a row that contains the same pencil mark in exactly two spots, as well as another parallel row that mirrors it containing the same pencil mark in only the. It starts with either two parallel rows or two parallel columns. Concerning your question about last week's B puzzle is.gd/kst_690_B. An X Wing is a technique for removing candidates (pencil marks).
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