Solving Sudoku without a pencil mark

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Solving Sudoku without a pencil mark

Postby Dipro » Sat May 09, 2020 11:06 am

Is there any way to solve hard Sudoku (with 17-19 digits or so) without any pencil marks? What is/are the way(s) of finding a make single without a pencil mark? Is there any book on it?
Dipro
 
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