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arkietech
Joined: 31 Jul 2008
Posts: 1834
Location: Northwest Arkansas USA
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 Posted: Mon Nov 14, 2011 5:06 pm Post subject: rh111411 |
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| Code: | *-----------*
|.71|...|...|
|.3.|7..|1..|
|5.9|4..|...|
|---+---+---|
|...|6..|49.|
|...|1.4|...|
|.95|..3|...|
|---+---+---|
|...|..5|6.8|
|..8|..2|.5.|
|...|...|27.|
*-----------*
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Marty R.
Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA
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| Posted: Mon Nov 14, 2011 8:20 pm Post subject: |
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XY-Chain; 3 in r9c3 proves 6 in r1c1; r89c1<>6
-or-
XY-Wing (672); r7c1<>2
| Code: |
+--------------+-------------+--------------+
| 26 7 1 | 5 236 68 | 389 2346 469 |
| 8 3 4 | 7 26 9 | 1 26 5 |
| 5 26 9 | 4 1236 168 | 38 236 7 |
+--------------+-------------+--------------+
| 1 8 23 | 6 5 7 | 4 9 23 |
| 2367 26 2367 | 1 9 4 | 5 8 23 |
| 4 9 5 | 2 8 3 | 7 16 16 |
+--------------+-------------+--------------+
| 279 14 27 | 39 147 5 | 6 134 8 |
| 67 14 8 | 39 1467 2 | 39 5 14 |
| 369 5 36 | 8 146 16 | 2 7 149 |
+--------------+-------------+--------------+
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Play this puzzle online at the Daily Sudoku site |
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arkietech
Joined: 31 Jul 2008
Posts: 1834
Location: Northwest Arkansas USA
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| Posted: Mon Nov 14, 2011 8:53 pm Post subject: |
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| Code: | *-----------------------------------------------------------*
| 26 7 1 | 5 236 68 | 389 2346 469 |
| 8 3 4 | 7 26 9 | 1 26 5 |
| 5 26 9 | 4 1236 168 | 38 236 7 |
|-------------------+-------------------+-------------------|
| 1 8 3-2 | 6 5 7 | 4 9 23 |
| 2367 d26 c367-2 | 1 9 4 | 5 8 23 |
| 4 9 5 | 2 8 3 | 7 16 16 |
|-------------------+-------------------+-------------------|
| 279 14 a27 | 39 147 5 | 6 134 8 |
|a67 14 8 | 39 67 2 | 39 5 14 |
| 369 5 b36 | 8 146 16 | 2 7 149 |
*-----------------------------------------------------------*
Another one -- psuedo cell w-wing
(2=6)r7c3,r8c1-(6)r9c3=(6)r5c6-(6=2) => r45c3<>2
There must be lots of these guys around!
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Marty, thanks for the xy-wing --I miised it--- makes this a vh puzzle. |
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Marty R.
Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA
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| Posted: Tue Nov 15, 2011 12:39 am Post subject: |
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I give up, I can't follow this like i could the last one.
What's the W-Wing?
What's the pseudo cell?
What's the strong link?
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arkietech
Joined: 31 Jul 2008
Posts: 1834
Location: Northwest Arkansas USA
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| Posted: Tue Nov 15, 2011 12:57 am Post subject: |
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| Marty R. wrote: | I give up, I can't follow this like i could the last one.
What's the W-Wing?
What's the pseudo cell?
What's the strong link?
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w-wing 26 (a,d) with 6 for strong link in col 6 (b,c)
pseudo cell denoted by (a) or (2=6)r7c3,r8c1 in block 7
hope that helps |
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Marty R.
Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA
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| Posted: Tue Nov 15, 2011 2:03 am Post subject: |
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It does. I can follow it now. Thanks. |
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tlanglet
Joined: 17 Oct 2007
Posts: 2468
Location: Northern California Foothills
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| Posted: Tue Nov 15, 2011 3:25 am Post subject: |
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Nice 6-cell AUR does some damage but does not solve the puzzle.
AUR (14)r789c259; internal SIS forces r9c6=1
Another one step solution is the xy-wing (23-6)r49c3+r5c2; r5c3<>6
Still another one stepper is the almost xy-wing(36-7)r59c3+r8c1 with fin (26)r5c3; r5c1<>7
If the xy-wing is true: r5c1<>7
If the fin is true: ls(26)r5c23-(2=3)r5c9-r4c9=r4c3-(3=6)r9c3-(6=7)r8c1; r5c1<>7
In notation form: xy-wing(36-7)r59c3+r8c1= ls(26)r5c23-(2=3)r5c9-r4c9=r4c3-(3=6)r9c3-(6=7)r8c1; r5c1<>7
Ted |
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ronk
Joined: 07 May 2006
Posts: 398
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| Posted: Tue Nov 15, 2011 4:59 am Post subject: |
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1-stepper with forgot-the-name-if-it-has-a-name wing:
(7=6)r8c1 - (6=3)r9c3 - (3)r9c1 = (3)r5c1 ==> r5c1<>7 |
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keith
Joined: 19 Sep 2005
Posts: 3355
Location: near Detroit, Michigan, USA
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| Posted: Tue Nov 15, 2011 7:51 am Post subject: |
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| ronk wrote: | 1-stepper with forgot-the-name-if-it-has-a-name wing:
(7=6)r8c1 - (6=3)r9c3 - (3)r9c1 = (3)r5c1 ==> r5c1<>7 |
Ron,
How do you define a "wing"?
I can't think of a definition that includes this pattern, and an XY- and a W-wing. (Do we even need such a definition?)
My notion of a wing is a simple chain with pincers, that can be recognized as a pattern.
Keith |
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ronk
Joined: 07 May 2006
Posts: 398
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| Posted: Tue Nov 15, 2011 11:25 am Post subject: |
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| keith wrote: | How do you define a "wing"?
I can't think of a definition that includes this pattern, and an XY- and a W-wing. (Do we even need such a definition?) |
Other than the x-wing, a wing is any useful chain of three native strong inferences using two or three digits (candidate values). |
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