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Luke451
Joined: 20 Apr 2008
Posts: 310
Location: Southern Northern California
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 Posted: Sat Apr 03, 2010 4:51 pm Post subject: |
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| nataraj wrote: | | peterj wrote: | I saw the xy-wing but searched longer and quickly found a nice 5-link xy-chain which is also a one-stepper...
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 I was not aware that there was a contest for the LONGEST chain ... 
But while I'm at it, might as well enter this beauty - it has 10 links (and of course it also solves the puzzle ...)
(6)r2c7-(6=5)r1c9-(5=1)r1c8-(1=2)r3c8-(2=6)r2c7-(6=5)r9c7-(5=9)r4c7-(9=8)r4c1-(8=5)r4c4-(5=1)r3c4-(1=6)r2c6-(6)r2c7; r2c7<>6
beautiful, just beautiful ...
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Start in r9c7 and no self-consumption required. Then you'll clearly have a ladies' high-heel shoe . |
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arjun
Joined: 28 Sep 2009
Posts: 16
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| Posted: Thu Apr 15, 2010 4:58 pm Post subject: |
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| I have just started doing these very hard puzzles and solved it with a type 6 Unique Rectangle with 26. Anyone else use this? |
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nataraj
Joined: 03 Aug 2007
Posts: 1048
Location: near Vienna, Austria
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| Posted: Thu Apr 15, 2010 6:19 pm Post subject: |
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arjun,
I suppose you are referring to the pattern in rows 2 and 8 / cols 3 and 7.
Careful, this is NOT a UR pattern.
For the "deadly" pattern, the two "floor" cells must be in one box, and the two "roof" cells must be in another box.
In this case here, there are two cells with 26 in rows 2 and 8, two cells with 26 in columns 3 and 7, but only ONE each in boxes 1,3,7,9. Thus, the solution is unique because the content of each cell would be determined by the other eight cells in the box. |
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arjun
Joined: 28 Sep 2009
Posts: 16
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| Posted: Thu Apr 15, 2010 7:42 pm Post subject: |
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| nataraj wrote: | arjun,
I suppose you are referring to the pattern in rows 2 and 8 / cols 3 and 7.
Careful, this is NOT a UR pattern.
For the "deadly" pattern, the two "floor" cells must be in one box, and the two "roof" cells must be in another box.
In this case here, there are two cells with 26 in rows 2 and 8, two cells with 26 in columns 3 and 7, but only ONE each in boxes 1,3,7,9. Thus, the solution is unique because the content of each cell would be determined by the other eight cells in the box. |
Ohh right... that didn't strike me. I eliminated 2s from r2c3 and r8c7. i guess i just got lucky to solve it then |
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