George Ho eBooks

'Explained SUDOKU' by Dr. George Ho: a book with Rules, Techniques, Uniform Method to solve SUDOKU puzzles, including 30 hard or vey hard SUDOKU puzzles with fully Explained Solutions.

SUDOKU Training by Dr. George Ho: a book full of value rules, candidate rules, examples, exercises with answers, complete sample solution... to help solve systematically and logically SUDOKU puzzles.