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Anon17 found 325 new 17 given sudokus!!!!!!!!

 
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ChPicard

Joined: 12 Mar 2008
Posts: 82
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Location: Montreal, Canada

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PostPosted: Tue Oct 13, 2009 10:45 pm    Post subject: Anon17 found 325 new 17 given sudokus!!!!!!!! Reply with quote

Hi everybody

Look that. Anon17 found 325 new 17 given sudokus!!!!!!!!

http://units.maths.uwa.edu.au/~gordon/sudokuid.php


Congratulations

Tell us anon17 how you do that. PLEASE

JPS
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coloin

Joined: 05 May 2005
Posts: 97
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PostPosted: Tue Oct 20, 2009 5:45 pm    Post subject: Reply with quote

Anon17 was in communication with Gordon Royle some time back and he "sort of" explained his methods.

Given that gsf tried exceedingly hard with multiple processors over a long period - and still didnt find the 325 that were out there - it remains possible/probable that there are others as yet undiscovered.

If we were to start the whole process again and were able to generate the same 49151 17-puzzles this would be an indication that we were close to closure.

Given the timing of the post I suspect that anon17 has maybe done this a couple of times !

C
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gsf

Joined: 18 Aug 2005
Posts: 411
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Location: NJ USA

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PostPosted: Wed Oct 21, 2009 11:53 am    Post subject: Reply with quote

coloin wrote:

Given that gsf tried exceedingly hard with multiple processors over a long period - and still didnt find the 325 that were out there - it remains possible/probable that there are others as yet undiscovered.

I lost the grid for ~6 weeks
the search re-started on 64 processors last week
in that time 75103 17s were generated,
24797 were essentially different
all were already in the catalog
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