Sudoku Programmers Forum Index

 
 FAQFAQ   SearchSearch   MemberlistMemberlist   UsergroupsUsergroups   RegisterRegister   ProfileProfile   Log inLog in          Games  Calendar

Log in to check your private messagesLog in to check your private messages   

NEWS:
Reputed Logically Impossible Sudoku Grid!

 
Post new topic   Reply to topic    Sudoku Programmers Forum Index -> Puzzles
View previous topic :: View next topic  
Author Message
Jay

Joined: 19 Apr 2011
Posts: 7
:
Location: London

Items
PostPosted: Wed Apr 27, 2011 6:21 pm    Post subject: Reputed Logically Impossible Sudoku Grid! Reply with quote

Hi all

Whilst browsing i have discovered
w.w.w.f.l.i..c.k.r.c.o.m/photos/npcomplete/2304537670/in/photostream/
(apologies for the .. but i haven't made enough posts to post a url!

Which apparently is a Sudoku puzzle which is Impossible for a human to solve.!!
Please try this out yourself or using any logical solver you have / can find

Here it is in string format:

000700800000040030000009001600500000010030040005001007500200600030080090007000002

...7..8......4..3......9..16..5......1..3..4...5..1..75..2..6...3..8..9...7.....2


Please test this out and return your findings!

I did not create and do not have anything to do with the generation of this puzzle!


EDIT:

**********
Results from a VERY long running Analysis by the Sudoku Explainer Java Application:

Analysis results
Difficulty rating: 10.6
This Sudoku can be solved using the following logical methods:
53 x Hidden Single
2 x Direct Hidden Pair
3 x Naked Single
6 x Pointing
1 x Claiming
1 x Naked Pair
1 x X-Wing
2 x Hidden Pair
1 x Naked Triplet
1 x Unique Rectangle type 1
1 x Forcing X-Chain
4 x Forcing Chain
1 x Nishio Forcing Chains
7 x Region Forcing Chains
5 x Cell Forcing Chains
4 x Dynamic Cell Forcing Chains
6 x Dynamic Region Forcing Chains
15 x Dynamic Contradiction Forcing Chains
7 x Dynamic Contradiction Forcing Chains (+)
6 x Dynamic Contradiction Forcing Chains (+ Forcing Chains)

*******
Which proves that this puzzle is solvable by logical means!

This appears to be a great test for any logical solver!


I simply found it intriguing!!
Back to top
View user's profile Send private message
Pat

Joined: 06 Sep 2006
Posts: 243
:

Items
PostPosted: Thu Apr 28, 2011 7:08 am    Post subject: Reply with quote

Jay wrote:
Whilst browsing i have discovered
    ...7..8......4..3......9..16..5......1..3..4...5..1..75..2..6...3..8..9...7.....2
which apparently is a Sudoku puzzle which is Impossible for a human to solve.!!
Please try this out yourself or using any logical solver you have / can find
Please test this out and return your findings!

this puzzle was originally posted by Ocean (2006.Nov.3) in the form
    001002000030040050600700800006000007010000030900000600007001008040030020000500900
the equivalent form (which you posted above)
was posted by oysterkite (2007.May.24)
( we never did discover who transformed Ocean's puzzle to this equivalent form )
Back to top
View user's profile Send private message
Jay

Joined: 19 Apr 2011
Posts: 7
:
Location: London

Items
PostPosted: Thu Apr 28, 2011 5:09 pm    Post subject: Ah Reply with quote

Ah sorry for the re-post in that case!
Back to top
View user's profile Send private message
Display posts from previous:   
Post new topic   Reply to topic    Sudoku Programmers Forum Index -> Puzzles All times are GMT
Page 1 of 1

 
Jump to:  
You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot vote in polls in this forum
Sudoku Programmers topic RSS feed 


Powered by phpBB © 2001, 2005 phpBB Group

Igloo Theme Version 1.0 :: Created By: Andrew Charron
FREE FORUM HOSTING by AtFreeForum. Terms of Service - Privacy Policy
FASHION ACCESSORIES - BLING BLING - LADIES WATCHES - KOREAN CHILDREN CLOTHING - ONLINE BARGAIN STORE - FASHION JEWELLERIES