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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Re: Solving Sudoku without a pencil mark

Postby Mauriès Robert » Mon Nov 16, 2020 1:20 pm

Hi Dipro,
Dipro wrote: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?

I don't think you can solve difficult puzzles without pencil marking, unless you have an outstanding memory. I know of a book whose author, a serious mathematician, gives the keys to solving without marking, but I remain doubtful about it.
The book is in French, here is a link to Amazon to find it:
https://www.cultura.com/cinq-techniques ... 50561.html
Cordialy
Robert
Mauriès Robert
 
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Location: France



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