The present book aims to provide systematic and reliable
techniques, called the global solution, for Sudoku puzzles. Any
proper Sudoku puzzle, which has one and only one solution of
Sudoku, can be solved by anyone following the techniques provided
in this book. Specific symbols are introduced to express the 6
basic rules of the Sudoku global solution, as the results, those
Sudoku solving techniques are presented similar to the annotations
in chess. Finnish mathematician Arto Inkala proposed 'the most
difficult Sudoku puzzle' in 2007. Then, he designed another
difficult Sudoku puzzle in 2012, named 'the thing Everest'. In the
present book the solving process of those two difficult Sudoku
puzzles are illustrated reliably by the specific symbols of the
global solution step by step.
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