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keith
Joined: 19 Sep 2005
Posts: 3355
Location: near Detroit, Michigan, USA
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 Posted: Wed Mar 30, 2011 9:58 pm Post subject: Helmut 3-27 Advanced |
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I found an interesting move in this one:
| Code: | HS032710adv
+-------+-------+-------+
| 4 . 8 | . . 2 | . . . |
| . . . | 5 . . | . 7 3 |
| . 9 . | . . . | 5 . . |
+-------+-------+-------+
| 5 . . | . 3 . | . . . |
| 7 . . | 6 . 8 | . . 1 |
| . . . | . 2 . | . . 8 |
+-------+-------+-------+
| . . 5 | . . . | . 6 . |
| 6 3 . | . . 4 | . . . |
| . . . | 8 . . | 3 . 2 |
+-------+-------+-------+
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Play this puzzle online at the Daily Sudoku site
Keith |
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Marty R.
Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA
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| Posted: Thu Mar 31, 2011 1:01 am Post subject: |
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I doubt that I found the interesting move. A Skyscraper forced r5c7<>4 which exposed a flightless XY-Wing (294). The transport forced r9c8<>4.
The only other move that I spotted was what looked to be a non-productive Finned X-Wing on 4. I look forward to seeing your interesting move. |
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keith
Joined: 19 Sep 2005
Posts: 3355
Location: near Detroit, Michigan, USA
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| Posted: Thu Mar 31, 2011 1:44 am Post subject: |
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After basics: | Code: | +----------------+----------------+----------------+
| 4 5 8 | 3 7 2 | 169 19 69 |
| 2 16 16 | 5 4 9 | 8 7 3 |
| 3 9 7 | 1 8 6 | 5 2 4 |
+----------------+----------------+----------------+
| 5 8 126 | 49 3 17 | 267 49 67 |
| 7 24 249 | 6 5 8 | 249 3 1 |
| 19 146 3 | 49 2 17 | 4679 5 8 |
+----------------+----------------+----------------+
| 8 124 5 | 27 19 3 | 1479 6 79B |
| 6 3 129 | 27 19A 4 | 179C 8 5 |
| 19 7 149 | 8 6 5 | 3 14-9 2 |
+----------------+----------------+----------------+ |
Note the useless 17-9 XYZ-wing ABC.
However, <9> in A can be transported to either B7R9 or B9R7, making the elimination shown in R9C8.
This is the first time I have ever found this, though I have seen it once before.
After that, a transported W-wing 1-9 solves R4C8 <4> to finish it off.
Given what Marty found, it seems there are probably a number of paths through this one.
Keith |
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Marty R.
Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA
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| Posted: Thu Mar 31, 2011 3:47 am Post subject: |
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| I saw that XYZ-Wing but the only transport I noticed was from cell B to A. I should've looked further. |
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tlanglet
Joined: 17 Oct 2007
Posts: 2468
Location: Northern California Foothills
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| Posted: Thu Mar 31, 2011 3:49 am Post subject: |
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Keith,
I have found and posted this pattern a few times. I believe that it was 'Luke" that indicated this is referred to as a "Kraken" xyz-wing.
I found some two step solutions using regular and/or almost moves but missed your interesting step.
Ted |
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ronk
Joined: 07 May 2006
Posts: 398
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| Posted: Thu Mar 31, 2011 4:30 am Post subject: |
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| keith wrote: | Note the useless 17-9 XYZ-wing ABC.
However, <9> in A can be transported to either B7R9 or B9R7, making the elimination shown in R9C8.
This is the first time I have ever found this, though I have seen it once before. |
Nice find, with transport to "B7R9" the slightly more elegant choice IMO. Why more elegant? No end-node overlap and no awkward box notation. I don't see either as being "kraken."
B7R9: (9=7)r7c9 - (7=19)als:r8c57 - (9)r8c3 = (9)r9c13 ==> r9c8<>9
B9R7: (9=71)als:[r7c9,r8c7] - (1=9)r8c5 - (9)r7c5 = (9)r7c79 ==> r9c8<>9
[edits: virtually a 100% rewrite]
Last edited by ronk on Thu Mar 31, 2011 11:44 am; edited 2 times in total |
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Marty R.
Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA
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| Posted: Thu Mar 31, 2011 5:08 am Post subject: |
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When I first saw this technique discussed, it was referred to as an XYZ-Transport. That seems much more descriptive than Kraken, which means nothing to me other than it sounds like an Eastern European name.  |
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keith
Joined: 19 Sep 2005
Posts: 3355
Location: near Detroit, Michigan, USA
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| Posted: Thu Mar 31, 2011 4:35 pm Post subject: |
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| Quote: | | I have found and posted this pattern a few times. |
Yes, I will have to change the way I look for XYZ-wings. I usually look in each box. In this case I would find 179 and 79 in B9. Then, I would look for 17 or 19 in C7, because there is a potential elimination in R7C7. I would not normally look in R8, for there are no possible eliminations in R8C89.
Keith |
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