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22 JULY VH (rare or normal)?

 
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Johan



Joined: 25 Jun 2007
Posts: 206
Location: Bornem Belgium
PostPosted: Sun Jul 22, 2007 11:30 pm    Post subject: 22 JULY VH (rare or normal)? Reply with quote
After spotting an XY-chain length 5, starting with number 8 in [R3C2] => [R2C3=9] => [R2C8=1] => [R6C8=6] => [R6C1=1], which eliminates the numbers 1 in R1C1,R2C1,R3C1 and R5C2, I noticed when the puzzle seizes up, I missed the XY-wing R4C2(pivot), which has the same eliminations like the XY-chain.
So is it rare or normal that two strategies overlap each other, with the exact same eliminations?

Code:

[code]
+--------------+-------------+----------+
| 136 146  47  | 2   136 9   | 17 5   8 |
| 156 2    89  | 168 7   568 | 3  19  4 |
| 135 18   79  | 4   138 58  | 2  79  6 |
+--------------+-------------+----------+
| 7   68   58  | 3   568 1   | 4  2   9 |
| 9   1468 458 | 68  568 2   | 16 3   7 |
| 16  3    2   | 7   9   4   | 8  16  5 |
+--------------+-------------+----------+
| 8   57   6   | 19  14  3   | 59 47  2 |
| 4   57   1   | 69  2   67  | 59 8   3 |
| 2   9    3   | 5   48  78  | 67 467 1 |
+--------------+-------------+----------+
[/code]
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jLo



Joined: 30 Apr 2007
Posts: 55
PostPosted: Mon Jul 23, 2007 2:21 am    Post subject: Re: 22 JULY VH (rare or normal)? Reply with quote
Johan wrote:

So is it rare or normal that two strategies overlap each other, with the exact same eliminations?
[/code]


Very common.
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Asellus



Joined: 05 Jun 2007
Posts: 865
Location: Sonoma County, CA, USA
PostPosted: Mon Jul 23, 2007 2:28 am    Post subject: Reply with quote
I see jLo just beat me to the reply after I clicked the "Post Reply" button. The more bivalues, the more possible paths. An XY-Wing is just the shortest XY Chain (other than a locked pair). Since this was the only step needed to solve this puzzle, it didn't seem VH to me.

By the way... how did you eliminate <8> from R3C3?
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Marty R.



Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA
PostPosted: Mon Jul 23, 2007 5:08 am    Post subject: Reply with quote
Quote:
By the way... how did you eliminate <8> from R3C3?


He's got a 1358 quad in row 3.
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Johan



Joined: 25 Jun 2007
Posts: 206
Location: Bornem Belgium
PostPosted: Mon Jul 23, 2007 8:08 am    Post subject: Removing 8 Reply with quote
There was a hidden pair [79] in R3
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