In this paper we discuss sudoku-solving strategies and how graph theory can be used to explain some of the advanced techniques. There are many websites that provide tutorials on solving sudoku puzzles. The sites [1] and [2] discuss the xy -chain technique, and the two explanations are quite different. We will define xy -chains as paths in a graph, and properties of the paths show why the technique works.
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Jeff Brown (2024) studied this question.
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