![]() Locked TripleĪ Naked Triple located in a single intersection. Locked PairĪ Naked Pair located in a single intersection. Solving Sudoku Strategy - Intersections Locked Candidates| Intersection Removal | Line-Box Interaction | Pointing (Pair, Triple) | ClaimingĬandidates are locked in the intersection of a line and a box. Alternating Inference Chain| AICĪ chain where each node is a candidate, with alternating strong and weak inference. Ī Forcing Chain that has implications in both directions.Ģ Forcing Chains starting from a bivalue cell or a bilocal unit showing a verity. The first originates from a reliable source. Several types of loops formed by cells following strict rules and a notation system. Broken WingĮliminations caused by loops of odd length. Simplified form of XY-Chain, involving only two digits. Advanced Sudoku Strategies - Chains and Loops Forcing Chain Kraken FishĪ fish pattern with indirect connections to a candidate which can be eliminated. Mutant Fishįish patterns with mixed sets of constraints. Franken Fishįish patterns that include box constraints. Incomplete basic fish patterns with a fin. Advanced Sudoku Strategies - Fish X-Wingįish patterns with additional candidates in a single box. Naked Single | Forced Digit | Sole CandidateĪ single candidate remaining in a cell. Hidden Single | Pinned DigitĪ single candidate remaining for a digit in a house. Solving Sudoku Strategy - Singles Full HouseĪ house with a single empty cell. 3D Medusa Coloring | Advanced ColoringĪ set of techniques that uses colors on multiple digits. Color WingĪ technique that uses multiple clusters to eliminate candidates outside these clusters. Color WrapĪ technique that uses a single cluster to detect a contradiction in one of the colors. Color TrapĪ technique that uses a single cluster to eliminate candidates outside the cluster. Uses only 2 colors, but also takes the implications for each color into account. Weak ColorsĮxtends Simple-Colors by the use of hinge linkages. Uses multiple colors (4, 6 or a higher multiple of 2) to form multiple color clusters. Uses only 2 colors to form a single color cluster. Advanced Sudoku Strategies - Coloring Simple Colors Sudoku software for PC - with the Color marking function and specific method to control candidate number,you can use the advanced techniques of sudoku more easily. Solving sudoku puzzles is easier than it looks.Learn more bout sudoku puzzles and how to solve them at There are many different solving sudoku strategies discovered. ![]() These are the strategies used to solve a Sudoku. If you can find two columns with only two identical positions for a given pencil mark, then the corresponding rows intersecting these positions can have all other candidates safely removed.How to solve sudoku - Solving sudoku strategies Of course, this whole concept can be rotated. In Sudoklue, the same pencil mark highlighting feature that helps me find hidden singles and omissions, can make X Wings easier to spot as well. Knowing that, all other 4s in the columns are not possible, and can be erased (erase all the pink 4s).Īgain, this is one of those hard to find methods. Based on what we said above, the 4s in these columns must exist where these two rows cross - that is, where the blue 4s are. Now if we think about this, we know that each of these rows has to have a 4, right? And we also know the 4s cannot be on top of each other, because that would put two 4s in the same column.īecause of this, we can safely assume that either the light blue cells or the dark blue cells must be 4s.Īrmed with this, let's zoom out all the way and shift our focus to the columns involved here (indicated with arrows below). ![]() Next, if we zoom out a bit, we can see that another row, two rows down, has the same two 4s, and in the same two spots: Here we see a row containing exactly two 4s: 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 same two spots, then you can use this information to eliminate similar pencil marks in the columns passing through those spots. It starts with either two parallel rows or two parallel columns. An X Wing is a technique for removing candidates (pencil marks).
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