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General Common Peer Elimination? http://www.rcbroughton.co.uk/sudoku/forum/viewtopic.php?f=10&t=836 |
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Author: | enxio27 [ Tue Oct 26, 2010 3:28 pm ] |
Post subject: | General Common Peer Elimination? |
What exactly is this? SudokuSolver gave this as a hint for a puzzle I'm working, but I had already eliminated the suggested digit from the pertinent cells. |
Author: | enxio27 [ Tue Nov 09, 2010 3:24 pm ] |
Post subject: | Re: General Common Peer Elimination? |
Ed suggested that I post the pertinent puzzle. Here it is: Code: .-------------------------------.-------------------------------.-------------------------------. | 689 58 4 | 2 7 15689 | 1589 1589 3 | | 1 7 2 | 3458 3589 3589 | 4589 6 589 | | 3689 35689 3568 | 458 5689 1589 | 2 14589 7 | :-------------------------------+-------------------------------+-------------------------------: | 4 69 3568 | 1 3568 358 | 3589 7 2 | | 689 1358 1358 | 7 468 2 | 35689 34589 1689 | | 7 2 13568 | 9 34568 34568 | 13568 1358 4568 | :-------------------------------+-------------------------------+-------------------------------: | 2 1368 7 | 358 134589 34589 | 35689 13589 5689 | | 368 4 1368 | 358 13589 3589 | 7 2 5689 | | 5 138 9 | 6 2 7 | 348 348 148 | '-------------------------------.-------------------------------.-------------------------------' Here is what SudokuSolver gave me as the next step: Quote: General Common Peer Elimination on 5 at r3c23 r1c2 in n1 Removed candidate from r5c2 I don't know what is meant by General Common Peer Elimination. I haven't tried going any further with this puzzle, since the list of required techniques according to JSudoku shows that the puzzle is well beyond my current skill level: Quote: JSudoku Techniques used:
38 Naked Single 27 Hidden Single 16 Intersection 2 Naked Pair 2 Two String Kite 1 Empty Rectangle 4 Turbot Fish 4 Finned X-Wing 10 Grouped Turbot Fish 3 XY-X-Chain up to 3 links 3 Grouped XY-Chain up to 3 links 3 Grouped XY-Chain 2 ALS-XZ up to 5 cells 2 ALS-XZ |
Author: | Ed [ Thu Nov 11, 2010 3:44 am ] |
Post subject: | Re: General Common Peer Elimination? |
enxio27 wrote: Here is what SudokuSolver gave me as the next step: Looks like you found a bug in SS but I can't get it to do this. Instead, it finds an ALSxz step but then needs brute force. Perhaps you could email Richard with the puzzle and version number of SS plus the exported .SSV routine order you are using.Quote: General Common Peer Elimination on 5 at r3c23 r1c2 in n1 Removed candidate from r5c2 enxio27 wrote: I don't know what is meant by General Common Peer Elimination This technique is common in killer sudoku when a cage and another cell force a common peer in strange places. On this site, we usually shorten it to CPE. See this thread. The simpler version, Common Peer Elimination is also common in sudoku variants such as jigsaw sudoku and x-sudoku. See here for some examples.According to JSudoku, the puzzle you have posted above has more than one solution so perhaps there is another constraint you overlooked. Tried a few variations with JS but it couldn't find one that gave a valid solution for those marks. However, I can't think of any possible constraint that SS would call General Common Peer Elimination unless it gets anti-chess Knight eliminations that way. SS sometimes does things in funny ways. Curious one. Thanks enxio! Cheers Ed |
Author: | enxio27 [ Thu Nov 11, 2010 3:54 am ] |
Post subject: | Re: General Common Peer Elimination? |
Ed wrote: According to JSudoku, the puzzle you have posted above has more than one solution so perhaps there is another constraint you overlooked. So sorry! Not overlooked--I just forgot to mention it. The puzzle is a Clover (windoku+asterisk). |
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