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keith
Joined: 19 Sep 2005
Posts: 3355
Location: near Detroit, Michigan, USA
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 Posted: Sat Jan 12, 2008 6:58 pm Post subject: Freep Friday Jan 11, 2008 |
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A tough one. I have yet to solve it.
| Code: | Puzzle: FP011108
+-------+-------+-------+
| . . . | . . . | . . . |
| . 4 1 | 6 . 7 | . 5 . |
| . . 9 | 2 . 8 | 7 . . |
+-------+-------+-------+
| . 8 3 | . 7 9 | 6 . . |
| . . . | . . . | . . . |
| . . 2 | 5 4 . | 1 7 . |
+-------+-------+-------+
| . . 7 | 4 . 2 | 8 . . |
| . 3 . | 7 . 5 | 2 6 . |
| . . . | . . . | . . . |
+-------+-------+-------+ |
Keith |
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Asellus
Joined: 05 Jun 2007
Posts: 865
Location: Sonoma County, CA, USA
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| Posted: Sat Jan 12, 2008 8:24 pm Post subject: |
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Keith,
I'm surprised, since one of your favorite special techniques is one of two steps that solve it. |
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keith
Joined: 19 Sep 2005
Posts: 3355
Location: near Detroit, Michigan, USA
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| Posted: Sat Jan 12, 2008 9:34 pm Post subject: |
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| Asellus wrote: | Keith,
I'm surprised, since one of your favorite special techniques is one of two steps that solve it. |
I haven't been working on it. Currently I have a remote pair <45> and a deadly pattern <39>. Then an X-wing (or coloring) on <5>.
Which brings me here:
| Code: | +----------------+----------------+----------------+
| 27 27 56 | 39 15 4 | 39 8 16 |
| 8 4 1 | 6 39 7 | 39 5 2 |
| 3 56 9 | 2 15 8 | 7 14 146 |
+----------------+----------------+----------------+
| 45 8 3 | 1 7 9 | 6 2 45 |
| 17 17 45 | 8 2 6 | 45 39 39 |
| 69 69 2 | 5 4 3 | 1 7 8 |
+----------------+----------------+----------------+
| 1569 169 7 | 4 369 2 | 8 139 1359 |
| 149 3 48 | 7 89 5 | 2 6 149 |
| 269 2569 4568 | 39 68 1 | 45 349 7 |
+----------------+----------------+----------------+ |
I'll give it another shot.
Keith |
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Marty R.
Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA
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| Posted: Sat Jan 12, 2008 9:55 pm Post subject: |
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I couldn't solve it in a satisfying way. There was remote pairs on the 45 and Medusa removed one candidate and then nothing. I don't know if anything could be done with the 39 and 69 URs, I sure couldn't. Each of the URs needed a 1 or a 5 to kill the DP, which sounded promising, but that's all.
Finally, I did a forcing chain, or DIC, as some like to call it, which finished it off. |
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Asellus
Joined: 05 Jun 2007
Posts: 865
Location: Sonoma County, CA, USA
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| Posted: Sun Jan 13, 2008 1:50 am Post subject: |
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The Remote Pair is, of course, the one thing to which I referred.
The other is an XY-Chain that removes <4> from r3c9 and solves the puzzle. The Pincers are connected via r1, c3 and r5. |
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storm_norm
Joined: 18 Oct 2007
Posts: 1741
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| Posted: Sun Jan 13, 2008 2:30 am Post subject: |
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how about a finned x-wing on 5??
then one on 4 later on? |
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