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Asellus
Joined: 05 Jun 2007
Posts: 865
Location: Sonoma County, CA, USA
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 Posted: Fri Nov 30, 2007 9:13 pm Post subject: LAT/Freep 30-Nov-07 |
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This one is somewhat challenging:
| Code: | +-------+-------+-------+
| . . 6 | . 2 . | 1 . . |
| 5 1 . | 6 9 8 | . . 2 |
| . 2 . | . . . | . . . |
+-------+-------+-------+
| . 5 . | . . . | 6 3 . |
| . . . | 4 . 5 | . . . |
| . 9 7 | . . . | . 5 . |
+-------+-------+-------+
| . . . | . . . | . 2 . |
| 6 . . | 1 5 3 | . 4 8 |
| . . 9 | . 4 . | 7 . . |
+-------+-------+-------+
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It is possible to solve it with one advanced step; but, good luck finding it! Or, you can do as I first did and hack away at it in various ways. |
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nataraj
Joined: 03 Aug 2007
Posts: 1048
Location: near Vienna, Austria
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| Posted: Fri Nov 30, 2007 10:02 pm Post subject: |
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so far, only the hacking solution: xy-chains starting with parts of the (useless) 18-19-89 xy-wing.
I'll try to find the advanced step tomorrow
edit: Medusa did it. I started with one of those "4"s that all hang together in a big chain/loop. No time now, I'll write it down tomorrow. |
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storm_norm
Joined: 18 Oct 2007
Posts: 1741
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| Posted: Fri Nov 30, 2007 10:25 pm Post subject: |
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hmm, I got a UR, but now I am lost.
i am going to look for some xy-chains. |
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nataraj
Joined: 03 Aug 2007
Posts: 1048
Location: near Vienna, Austria
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| Posted: Fri Nov 30, 2007 10:32 pm Post subject: |
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I couldn't do it. (seems to be a troubling sign of addiction...hm.mental note. watch out) can't go away without writing it down. Here goes.
From this grid after basics (well, not sure just how basic)
| Code: |
+--------------------------+--------------------------+--------------------------+
| 79 4g8 6 | 5 2 47 | 1 8g9 3 |
| 5 1 3 | 6 9 8 | 4 7 2 |
| 79 2 48 | 37 137 147 | 5 68r9 69 |
+--------------------------+--------------------------+--------------------------+
| 248 5 148 | 2789 178 1279 | 6 3 147 |
| 238 6 18 | 4 1378 5 | 28 19 179 |
| 2348 9 7 | 238 1368 126 | 28 5 14 |
+--------------------------+--------------------------+--------------------------+
| 14g8 48g 5 | 79 678 679 | 3 2 16 |
| 6 7 2 | 1 5 3 | 9 4 8 |
| 18 3 9 | 28 4 26 | 7 16 5 |
+--------------------------+--------------------------+--------------------------+
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where I've marked just part of the medusa coloring ... just the green part plus the one "8" in r3c8....
from (g) r7c2=8 => r9c1=1 => r9c8=6
from (r) r3c8=8 => r3c8<>6 => r9c8=6
we get r9c8=6 and the puzzle is solved.
edit:
in other words, a discontinuous nice loop:
r9c8=6 has strong links to both r9c8=1 and r3c8=6 and from there it's alternating weak and strong links all the way around |
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re'born
Joined: 28 Oct 2007
Posts: 80
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| Posted: Fri Nov 30, 2007 11:05 pm Post subject: |
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| How's about a semi-remote naked pair in r5c3,r9c1 <18> connected by 1's and eliminating 8 from r456c1, solving the puzzle? |
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Asellus
Joined: 05 Jun 2007
Posts: 865
Location: Sonoma County, CA, USA
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| Posted: Sat Dec 01, 2007 12:05 am Post subject: |
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That semi-remote naked pair (aka W-Wing) certainly does it.
I was referring to an XY Chain that pretty much follows nataraj's color path and removes <1> from R9C8.
Those who want to practice coloring from (or transporting) pincers can play around with digit <8> in this puzzle. |
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Marty R.
Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA
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| Posted: Sat Dec 01, 2007 12:27 am Post subject: |
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| re'born wrote: | | How's about a semi-remote naked pair in r5c3,r9c1 <18> connected by 1's and eliminating 8 from r456c1, solving the puzzle? |
I looked for W-Wings, but obviously missed this one. However, a simple XY-Chain established the same pincers and made the same eliminations. |
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