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Sudoku identification service

 
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ChPicard

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

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PostPosted: Fri Jul 03, 2009 2:36 pm    Post subject: Sudoku identification service Reply with quote

Hi

Is there a new address for this Royle's site?

Thank you
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strmckr

Joined: 24 Apr 2009
Posts: 52
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PostPosted: Sat Jul 04, 2009 3:03 am    Post subject: Reply with quote

Gordon Royle page seems to be down and is moveing to a new host site.


http://www.csse.uwa.edu.au/~gordon/

http://www.csse.uwa.edu.au/~gordon/sudokumin.php

http://school.maths.uwa.edu.au/~gordon/sudokuid.php
{complet listing of known 17's}

these all seem to be offline Sad
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gsf

Joined: 18 Aug 2005
Posts: 408
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Location: NJ USA

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PostPosted: Sat Jul 25, 2009 3:05 pm    Post subject: Reply with quote

the site moved to
http://units.maths.uwa.edu.au/~gordon/sudokuid.php
thanks to Gordon for resuscitating the service

Jean-Pierre, any change in your strategy for the recent batch of additions?
on my side its the same search but on ~200 cores
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gsf

Joined: 18 Aug 2005
Posts: 408
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PostPosted: Sun Jul 26, 2009 2:23 pm    Post subject: Reply with quote

to help others get in sync I just posted the current 48750
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ChPicard

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

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PostPosted: Mon Jul 27, 2009 2:42 pm    Post subject: Reply with quote

gsf wrote:
Jean-Pierre, any change in your strategy for the recent batch of additions?
on my side its the same search but on ~200 cores


Hi Glenn

8 new 17-clue sudokus the same day, it is a fantastic chance. Zero yesterday and zero today.

I continue to perturbate the clues in the Royle's list searching a new one "between" 2 known grids in the minlex form.

Thanks for stimulation

Jean-Pierre
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gsf

Joined: 18 Aug 2005
Posts: 408
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Location: NJ USA

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PostPosted: Mon Jul 27, 2009 3:43 pm    Post subject: Reply with quote

ChPicard wrote:
gsf wrote:
Jean-Pierre, any change in your strategy for the recent batch of additions?
on my side its the same search but on ~200 cores


Hi Glenn

8 new 17-clue sudokus the same day, it is a fantastic chance. Zero yesterday and zero today.

I continue to perturbate the clues in the Royle's list searching a new one "between" 2 known grids in the minlex form.

Thanks for stimulation

Jean-Pierre

is your search within an interval random or complete?
if complete then you can identify intervals that contain no 17s
have any such intervals been identified yet?
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ChPicard

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

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PostPosted: Tue Jul 28, 2009 10:22 am    Post subject: interval random or complete? Reply with quote

gsf wrote:
Jean-Pierre
is your search within an interval random or complete?
if complete then you can identify intervals that contain no 17s
have any such intervals been identified yet?


I limited the search depending on the statistics for all the Royle's grids :
less than 5 clues in a row, column or box and less than 5 empty groups (row, column or box).

Maybe the sixteen clue sudoku is weird. Laughing

Here in Quebec, it is always raining this summer, I have time to continue searching.

JPS
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