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X-treme Nov 25

 
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emm
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Joined: 11 Oct 2006
Posts: 34

PostPosted: Sun Nov 26, 2006 5:39 pm    Post subject: X-treme Nov 25 Reply with quote

There were a couple of Unique rectangles in this puzzle.

This is a particularly beautiful one Very Happy

Code:
+---------------+---------------+------------------+
| 59   249  6   | 8    3   247  | 4579  4579  1    |
| 78   47   3   | 9    1   5    | 2     6     48   |
| 589  1    29  | 24   6   247  | 59    3479  3489 |
+---------------+---------------+------------------+
| 79   79   1   | 6    2   3    | 8     45*   45*  |
| 2    6    4   | 5    8   9    | 3     1     7    |
| 3    8    5   | 7    4   1    | 6     29    29   |
+---------------+---------------+------------------+
| 6    3    29  | 1    7   8    | 459   2459* 2459*|
| 1    29   8   | 234  5   24   | 479   2379  6    |
| 4    5    7   | 23   9   6    | 1     8     23   |
+---------------+---------------+------------------+


Am I right that you can't use the 29 / 29 only the 45 / 45?
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Ruud
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Joined: 30 Dec 2005
Posts: 601

PostPosted: Sun Nov 26, 2006 9:11 pm    Post subject: Reply with quote

Both UR's avoid the diagonals and can be used AFAICS. Narrow

The -45- UR has a type 3 elimination:

r7c89 must contain either a 2 or a 9 to avoid a deadly -45- pattern. r7c2 must contain either a 2 or a 9. You can eliminate 9 from r7c7, leaving 45.

This brings us to step 2 Very Happy

r7c89 must contain either a 4 or a 5 to avoid the deadly -29- pattern. r7c7 must contain either 4 or 5. You can eliminate 4 from r8c7, leaving 79.

Those are 2 sequential UR3 moves. Too good to be true. You missed a locked candidates move that would eliminate 4 from r8c7.

Ruud
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“If the human brain were so simple that we could understand it, we would be so simple that we couldn't.” - Emerson M Pugh
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emm
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Joined: 11 Oct 2006
Posts: 34

PostPosted: Mon Nov 27, 2006 5:37 pm    Post subject: Reply with quote

I did miss that Ruud, because my eyes were set on the glittering prizes. FYI, I also ignored the hidden 5 in D/ which would have really taken the glisten off.

BTW thanks for the smiley WNE. I should have said so earlier but I didn’t because I didn't know how to say that it looks a bit cross without appearing ungrateful. If it had a straight mouth it would look more sly IMCO. Very Happy
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Ruud
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PostPosted: Mon Nov 27, 2006 7:16 pm    Post subject: Reply with quote

Quote:
If it had a straight mouth it would look more sly IMCO.


OK, you may need to refresh your browser to see the new image Narrow

Ruud
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“If the human brain were so simple that we could understand it, we would be so simple that we couldn't.” - Emerson M Pugh
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emm
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PostPosted: Mon Nov 27, 2006 7:27 pm    Post subject: Reply with quote

Actually I think it was the eyes that needed to be straight Rolling Eyes
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Ruud
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PostPosted: Mon Nov 27, 2006 8:01 pm    Post subject: Reply with quote

I give up Yeah...
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emm
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Posts: 34

PostPosted: Tue Nov 28, 2006 10:08 am    Post subject: Reply with quote

That’s OK Ruud, if it’s too hard. Very Happy

PS: The new one looks like a smiley WCP to me. Narrow
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