Sudoku Players' Forums

Drjsguo · Joined: 23 Oct 2006 Posts: 24 Location: California, USA

I discovered a logic-Sudoku named Mudan Rainbow Sudoku that has only eleven digits. Is this the ultimate minimum-digits limit for a 9X9 Sudoku puzzle?

www.chinasudoku.com

Who has seen one less than that before? Please tell us.

Drjsguo 3/3/2007

udosuk · Joined: 17 Jul 2005 Posts: 2835 Location: Sydney, Australia

I've posted a couple with eight:

http://www.sudoku.com/boards/viewtopic.php?t=4566

The absolute minimum is zero, but that's another story...

Drjsguo · Joined: 23 Oct 2006 Posts: 24 Location: California, USA

Very interesting. Thanks!

I was thinking the minimum digits required could be 8. I never thought zero is the answer. Could you give us more info?

Drjsguo · Joined: 23 Oct 2006 Posts: 24 Location: California, USA

After think it over again, I finally get your point. I agree with you “zero” is the minimum digit for logic Sudoku, if all numbers are restricted to certain rules. In that case, since all 81 numbers are fixed. Without any number showing we are still be able to get the answer.

Thanks for your answer.

udosuk · Joined: 17 Jul 2005 Posts: 2835 Location: Sydney, Australia

Yes, you got the concept why zero is possible...

Here is an example:

Drjsguo · Joined: 23 Oct 2006 Posts: 24 Location: California, USA

Nice tip. Thanks.