Solution Techniques for Sudoku puzzles are described for the junior Exocet and BigFish Techniques, and the following which are based on "xy-chaining": - Related Values Chaining - Chain Trees - Chaining Methods.The junior Exocet Technique uses a complicated pattern involving ten main and eighteen secondary cells.The BigFish Techniques use patterns of four, nine, sixteen and twenty-five cells.Related Values Chaining extends xy-chaining to analyze row-, column- and box- interactions between chain links and cells that are not part of the chain. A group of two or more chains are considered. Related values analysis can solve puzzle cells that are not links in the chain, and can determine additional cells that can be used as chain links leading to longer chains.Tree Chaining extends xy-chaining for multiple branches and incorporates Related Values Chaining. A "Chain Tree" is a multi-branched chain.The Chaining Methods extend xy-chaining to allow a three-, four- or five- valued cell, or a pair of three-valued cells to be included.
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