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18 September 2007 @ 11:29 pm
If You're Going to San Francisco ...  


So its been awhile since I've posted so I figured I'd give a puzzle which I wrote in June. The above puzzle is a new type called a Mastermindoku which combines the classic Mastermind game with Sudoku. Your goal is to form a valid sudoku solution using some subset of the numbers 1 to 9; that subset of numbers will appear a single time in each row, column, and 2x3 box. Two grid guesses are given above, both for the same solution grid, and as in the game Mastermind the value of these guesses is given with white and black circles. Any white circle indicates that there is a correct digit in that row/column but that it is not in the correct position. Any black circle indicates that there is a correct digit in the correct place in that row/column. The answer can be found by logic alone, and this example is meant to be more illustrative of the type than incredibly fiendish so please comment if you are finding it too hard.

In quick Dr. Sudoku life news, I've now moved into a nice 1BR/BA apartment in the College Terrace area of Palo Alto near Stanford. I'm still getting settled and still have much of my stuff in transit from the East Coast. Normal blog posting likely won't return until I've attained all the consumer electronics I mean to purchase for my apartment and have wireless set-up as well, so most likely in October around the WPC (expect a pre- and post-trip report) and then the US Sudoku Championship. Otherwise, loving my time in the Bay Area so far.
lunchboylunchboy on September 19th, 2007 01:00 pm (UTC)
This idea is, like so many of your sudoku variants, brilliant.
thedan on September 19th, 2007 02:04 pm (UTC)
Very smooth solve. Nice work as always.
Adam R. Wood: butasanzotmeister on September 19th, 2007 05:26 pm (UTC)
Oh, now this is just beautiful. I so need to make one myself. - ZM
zundevilzundevil on October 2nd, 2007 06:48 am (UTC)
So, like, just in case anyone was wondering -- you will reach the same solution even if you relax the stipulation that the same six digits are in each row/column/region.

Not that I mistakenly did it the first time that way or anything...

(Anonymous) on October 2nd, 2007 06:51 pm (UTC)
Thomas - It's Craig Wilson at USA Today. We're starting reserach on a story on Sudoku and we'd love to talk to you. Do you have a cellphone number, an e-mail address where I can contact you?
motrismotris on October 2nd, 2007 07:50 pm (UTC)
I do - email me your contact info at drsudoku@gmail.com and I can send you my cell number.
lardarsegreg on March 7th, 2008 03:51 pm (UTC)
So let me get this straight... there are exactly 6 digits used in the solution?
motrismotris on March 7th, 2008 04:43 pm (UTC)
Yes, there is some set of 6 digits from 1-9 that will appear once in each row/column/box. The set could be {1,2,3,4,5,6}, it could be {2,3,4,6,8,9}, who knows? You have to determine this set. However, no digit will repeat in this set (so it is not 1,1, 2, 3, 5, 8). I'd have to specify a new rule to go all Fibonacci on you.
lardarsegreg on March 7th, 2008 07:32 pm (UTC)
Just a I thought.

Reminds me of my "Binary Star" puzzle which also had you trying to work out which six of 1-9 are used. Did you see that one?
motrismotris on March 7th, 2008 07:34 pm (UTC)
No, I don't think I ever saw that one - do you have a simple link to it? googling "binary star puzzle" is failing
lardarsegreg on March 7th, 2008 07:43 pm (UTC)
I only posted it at the DJApe forums. Hang on a moment...

Here it is. Given it as a link as the image is a bit page-stretching. The original description follows:

The 9x9 part is fairly standard. Where it gets fun is the 6x6 part. That has 6 numbers, but you don't know which 6...

This idea could easily be applied to different size combinations, killers wiith diagonals, multiple places of overlap, non-killers, etc. The possibilities are endless...

Thanks to HATMAN, Howard S, jcbonsai, and udosuk for testing this beast, and for helping me to spot both errors in the original version fairly quickly. I hope that other sudoku creators will be inspired by this, and maybe even take it one step further...