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keith
Joined: 19 Sep 2005
Posts: 3355
Location: near Detroit, Michigan, USA
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 Posted: Fri Dec 19, 2008 9:52 pm Post subject: Yesterday's BB sh |
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Just a touch more than this site's Very Hard:
| Code: | Puzzle: BB121808sh
+-------+-------+-------+
| 1 . . | . 2 . | . . 4 |
| . . 8 | 3 . 9 | 5 . . |
| . 2 . | . . . | . 8 . |
+-------+-------+-------+
| . 9 . | . 8 . | . 1 . |
| 8 . . | 6 . 7 | . . 9 |
| . 5 . | . 3 . | . 7 . |
+-------+-------+-------+
| . 7 . | . . . | . 5 . |
| . . 5 | 4 . 2 | 6 . . |
| 2 . . | . 9 . | . . 7 |
+-------+-------+-------+ |
Keith |
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storm_norm
Joined: 18 Oct 2007
Posts: 1741
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| Posted: Fri Dec 19, 2008 10:14 pm Post subject: |
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keith
Joined: 19 Sep 2005
Posts: 3355
Location: near Detroit, Michigan, USA
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| Posted: Fri Dec 19, 2008 10:24 pm Post subject: |
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I did not see that! There are at least three other "advanced" moves. After "basics": | Code: | +----------------+----------------+----------------+
| 1 36 369 | 58 2 58 | 7 369 4 |
| 7 46 8 | 3 14 9 | 5 26 12 |
| 5 2 349 | 7 14 6 | 19 8 13 |
+----------------+----------------+----------------+
| 6 9 7 | 2 8 4 | 3 1 5 |
| 8 13 13 | 6 5 7 | 24 24 9 |
| 4 5 2 | 9 3 1 | 8 7 6 |
+----------------+----------------+----------------+
| 39 7 14 | 18 6 38 | 1249 5 1238 |
| 39 18 5 | 4 7 2 | 6 39 18 |
| 2 1468 146 | 158 9 358 | 14 34 7 |
+----------------+----------------+----------------+ |
Keith |
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daj95376
Joined: 23 Aug 2008
Posts: 3854
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| Posted: Fri Dec 19, 2008 10:46 pm Post subject: |
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Besides XY-Chains, did you see this companion to Norm's solution?
| Quote: | W-Wing <14> in Band 3 => [r7c7],[r9c23]<>4
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tlanglet
Joined: 17 Oct 2007
Posts: 2468
Location: Northern California Foothills
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| Posted: Fri Dec 19, 2008 11:11 pm Post subject: |
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Another one-stepper: | Quote: | UR <58> r19c46. Pseudo-cell <13> from UR & r9c78 gives subset <134>; delete <14> in r9c23
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Ted |
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keith
Joined: 19 Sep 2005
Posts: 3355
Location: near Detroit, Michigan, USA
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| Posted: Sat Dec 20, 2008 12:09 am Post subject: |
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The <14> W-wing with 3 eliminations is really cool.
Yes, I saw the UR elimination on pencil & paper. Is it a one-stepper?
The way I solved it (P&P), after the UR, was with a pseudo-cell to create an extended XY-wing. | Code: | +----------------+----------------+----------------+
| 1 36 369 | 58 2 58 | 7 36-9 4 |
| 7 46 8 | 3 14 9 | 5 26 12 |
| 5 2 349 | 7 14 6 | 19a 8 13 |
+----------------+----------------+----------------+
| 6 9 7 | 2 8 4 | 3 1 5 |
| 8 13 13 | 6 5 7 | 24 24 9 |
| 4 5 2 | 9 3 1 | 8 7 6 |
+----------------+----------------+----------------+
| 39 7 14 | 18 6 38 | 1249 5 1238 |
| 39 18 5 | 4 7 2 | 6 39d 18 |
| 2 1468 146 | 158 9 358 | 14b 34c 7 |
+----------------+----------------+----------------+ |
There are so many bi-value cells, there must be something! Look at R89C8, c and d; <39> and <34> means that these two cells contain one of <49>. So a b cd is an extended XY-wing that takes out <9> in R1C8, solving the puzzle.
I have taken to looking for these before I look for the possible pairs and strong links that might make skyscrapers, W-wings, etc.
Keith |
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cgordon
Joined: 04 May 2007
Posts: 769
Location: ontario, canada
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| Posted: Sat Dec 20, 2008 1:54 pm Post subject: |
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I am of course a heavy user of w-wings (since I learnt about them this week). After a Type 4 UR (58) there were w -wings on 14 and 18.
(I think). |
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