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Strange pattern

 
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ravel



Joined: 21 Apr 2006
Posts: 536
PostPosted: Sat Jun 07, 2008 12:36 pm    Post subject: Strange pattern Reply with quote
Code:
+-------+-------+-------+
| . . . | . . . | . . . |
| . . 1 | 2 4 8 | 5 . . |
| . 7 . | . . . | . 4 . |
+-------+-------+-------+
| . 2 . | . . 6 | . 9 . |
| . 4 . | . 2 . | . 7 . |
| . 8 . | . 7 . | . 1 . |
+-------+-------+-------+
| . 6 . | . . . | . 3 . |
| . . 7 | 5 1 9 | 6 . . |
| . . . | . . . | . . . |
+-------+-------+-------+ m_b_metcalf

>>> play online

Not hard to solve, though its too hard for the online solver ...
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nataraj



Joined: 03 Aug 2007
Posts: 1048
Location: near Vienna, Austria
PostPosted: Sat Jun 07, 2008 1:10 pm    Post subject: Reply with quote
the online solver doesn't seem to recognize xy-chains...
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nataraj



Joined: 03 Aug 2007
Posts: 1048
Location: near Vienna, Austria
PostPosted: Sat Jun 07, 2008 1:13 pm    Post subject: Reply with quote
...
(like for example the generalized xy-wing 34-(36-26)-24 "pivot" row 3, but there are many others)

Code:

+--------------------------+--------------------------+--------------------------+
| 48      5       46       | 367     9       137      | 18      2       13       |
| 3       9       1        | 2       4       8        | 5       6       7        |
| 28      7       26       | 36      5       13       | 189     4       139      |
+--------------------------+--------------------------+--------------------------+
| 7       2       5        | 1       3       6        | 4       9       8        |
| 1       4       9        | 8       2       5        | 3       7       6        |
| 6       8       3        | 9       7       4        | 2       1       5        |
+--------------------------+--------------------------+--------------------------+
| 5       6       24       | 47      8       27       | 19      3       19       |
| 24      3       7        | 5       1       9        | 6       8       24       |
| 9       1       8        | 34      6       23       | 7       5       24       |
+--------------------------+--------------------------+--------------------------+


BTW, I did try the UR 19 r37c79, removes 1 from r3c79 and sets r3c6=1 but that did not get me very far
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keith



Joined: 19 Sep 2005
Posts: 3355
Location: near Detroit, Michigan, USA
PostPosted: Sat Jun 07, 2008 1:36 pm    Post subject: Reply with quote
nataraj wrote:
...
BTW, I did try the UR 19 r37c79, removes 1 from r3c79 and sets r3c6=1 but that did not get me very far


Why not? It leaves a BUG+1.

Keith
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storm_norm



Joined: 18 Oct 2007
Posts: 1741
PostPosted: Sat Jun 07, 2008 5:17 pm    Post subject: Reply with quote
keith wrote:
nataraj wrote:
...
BTW, I did try the UR 19 r37c79, removes 1 from r3c79 and sets r3c6=1 but that did not get me very far


Why not? It leaves a BUG+1.

Keith


definitely easier than looking for the chains, imo.
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nataraj



Joined: 03 Aug 2007
Posts: 1048
Location: near Vienna, Austria
PostPosted: Sun Jun 08, 2008 11:04 am    Post subject: Reply with quote
keith, Norm,

you are absolutely right, of course. I was so busy looking for xy-wings that I did not see the BUG+1
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