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Lynne_H
Joined: 13 Jul 2007
Posts: 3
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 Posted: Fri Jul 13, 2007 12:27 am Post subject: July 8 |
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The hint says a 3 in R4C1. Can someone tell me why?
[code]
+---------+-------------+-----------+
| 13 13 2 | 6 9 58 | 458 7 48 |
| 9 7 4 | 358 358 1 | 58 6 2 |
| 8 6 5 | 7 4 2 | 9 3 1 |
+---------+-------------+-----------+
| 13 5 9 | 48 6 478 | 147 2 347 |
| 6 4 8 | 2 17 3 | 17 9 5 |
| 2 13 7 | 9 15 45 | 6 8 34 |
+---------+-------------+-----------+
| 7 8 1 | 35 35 6 | 2 4 9 |
| 4 2 3 | 1 78 9 | 78 5 6 |
| 5 9 6 | 48 2 478 | 3 1 78 |
+---------+-------------+-----------+
Thanks, |
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jLo
Joined: 30 Apr 2007
Posts: 55
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| Posted: Fri Jul 13, 2007 2:02 am Post subject: Re: July 8 |
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| Lynne_H wrote: | The hint says a 3 in R4C1. Can someone tell me why?
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Just a guess, but an XY-Wing at R1C6, R1C9, and R6C6 eliminates the <4> at
R6C9, which forces a <1> at R6C2, which forces a 3 at R4C1. I'm not sure why
it wouldn't call out R6C9 first, but all three cells are tightly linked. |
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Asellus
Joined: 05 Jun 2007
Posts: 865
Location: Sonoma County, CA, USA
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| Posted: Fri Jul 13, 2007 3:05 am Post subject: |
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Lynne_H,
First a little housekeeping using that 48 Naked Pair in C4.
| Code: | +---------+-------------+-----------+
| 13 13 2 | 6 9 58 | 458 7 48 |
| 9 7 4 | 35 358 1 | 58 6 2 |
| 8 6 5 | 7 4 2 | 9 3 1 |
+---------+-------------+-----------+
| 13 5 9 | 48 6 478 | 147 2 347 |
| 6 4 8 | 2 17 3 | 17 9 5 |
| 2 13 7 | 9 15 45 | 6 8 34 |
+---------+-------------+-----------+
| 7 8 1 | 35 35 6 | 2 4 9 |
| 4 2 3 | 1 78 9 | 78 5 6 |
| 5 9 6 | 48 2 478 | 3 1 78 |
+---------+-------------+-----------+ |
There is an XY-Wing with pivot R1C6 that removes <4> from R6C9, leading immediately to <3> at R4C1. However, a better Hint would have been <3> at R6C9. That's the most direct that I can see.
Even without this XY-Wing, the puzzle succumbs totally to the 35 UR in C45 [R2C5 must be 8]. |
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Glassman
Joined: 21 Oct 2005
Posts: 50
Location: England
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| Posted: Sat Aug 11, 2007 2:09 am Post subject: |
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| Asellus wrote: | | ... There is an XY-Wing with pivot R1C6 that removes <4> from R6C9, leading immediately to <3> at R4C1. ... |
Asellus — Thanks for that. I had done a little more housekeeping with a couple of simple and obvious x-wings, resulting in a tidier c7, thus
| Code: | +---------+------------+----------+
| 13 13 2 | 6 9 58 | 45 7 48 |
| 9 7 4 | 35 358 1 | 58 6 2 |
| 8 6 5 | 7 4 2 | 9 3 1 |
+---------+------------+----------+
| 13 5 9 | 48 6 478 | 14 2 347 |
| 6 4 8 | 2 17 3 | 17 9 5 |
| 2 13 7 | 9 15 45 | 6 8 34 |
+---------+------------+----------+
| 7 8 1 | 35 35 6 | 2 4 9 |
| 4 2 3 | 1 78 9 | 78 5 6 |
| 5 9 6 | 48 2 478 | 3 1 78 |
+---------+------------+----------+ |
However, that UR was so obvious, shouting at me "Drop your standards — you know that that there is a unique solution", that I failed to see this xy-wing.
Ho hum.
Glassman  |
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