## Is â€œ11â€ the ultimate minimum-digits for logic-Sudoku puzzle?

Everything about Sudoku that doesn't fit in one of the other sections

### Is â€œ11â€ the ultimate minimum-digits for logic-Sudoku puzzle?

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
Drjsguo

Posts: 24
Joined: 23 October 2006

I've posted a couple with eight:

http://forum.enjoysudoku.com/viewtopic.php?t=4566

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

Posts: 2698
Joined: 17 July 2005

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

Posts: 24
Joined: 23 October 2006

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.

Drjsguo

Posts: 24
Joined: 23 October 2006

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

Here is an example:

19 months ago, tso wrote:
Code: Select all
`. . . | . . . | . . .. . . | . . . | . . .. . . | . . . | . . .------+-------+------. . . | . . . | . . .. . . | . . . | . . .. . . | . . . | . . .------+-------+------. . . | . . . | . . .. . . | . . . | . . .. . . | . . . | . . .`

Place the digits in this Sudoku such that the resulting 81 digit number formed by stringing the rows one after the other in order from top to bottom is minimum.

PS: Despite being a Chinese speaker, I never had a seriously strong interest in your website... But I guess it's a nice one, so keep up the good work!
udosuk

Posts: 2698
Joined: 17 July 2005

Nice tip. Thanks.
Drjsguo

Posts: 24
Joined: 23 October 2006