X-Wings and the Rectangle Rule for Solving Medium to Hard Sudoku Puzzles

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In which I solve an EXTREME SUDOKU for Twitter

Tutorial 58. Hard sudoku puzzle with lots of techniques.

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Tutorial #50 Solving a hard puzzle from the beginning to the end

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Tutorial #56. A difficult puzzle solved from beginning to end. Lots to learn.

Х-wing - an Advanced Sudoku technique

Tutorial #40 A must know technique. NOT a puzzle.

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