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hughwill
Joined: 05 Apr 2010
Posts: 424
Location: Birmingham UK
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 Posted: Mon Apr 25, 2016 9:56 am Post subject: Apr 25 VH(?) |
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You wait for a VH to come along and it isn't. This one falls through basics
only, though there are many pairs and triples first.
Hugh |
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the_lock_man
Joined: 18 Dec 2012
Posts: 40
Location: Portsmarfff, UK
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| Posted: Mon Apr 25, 2016 11:34 am Post subject: |
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I'm glad it wasn't just me that thought that.  |
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RobertRattley
Joined: 24 Jun 2007
Posts: 118
Location: Australia
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| Posted: Mon Apr 25, 2016 1:08 pm Post subject: |
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| Yes, only "hard". And I don't know about "many pairs and triples": I needed just one triple 137 in row 7. |
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dongrave
Joined: 06 Mar 2014
Posts: 572
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| Posted: Mon Apr 25, 2016 10:46 pm Post subject: |
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So anyway I got to the following point:
| Code: |
+-------------+----------------+--------------+
| 39 1 5 | 2378 367 368 | 2789 237 4 |
| 6 379 2 | 3578 4 1358 | 5789 137 19 |
| 8 37 4 | 2357 1357 9 | 257 1237 6 |
+-------------+----------------+--------------+
| 7 4 6 | 1 8 2 | 3 9 5 |
| 1 2 9 | 35 356 356 | 4 8 7 |
| 5 8 3 | 4 9 7 | 1 6 2 |
+-------------+----------------+--------------+
| 349 5 17 | 6 137 13 | 279 1247 8 |
| 49 6 178 | 5789 2 158 | 79 147 3 |
| 2 379 178 | 3789 137 4 | 6 5 19 |
+-------------+----------------+--------------+
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And then I says to myself... I says 'Don' I says 'It's a VH so there MUST be a VH move somewhere. Aha! There it is! An X-Wing of 9's in columns 2 and 9! So r9c4<>9 which means r8c4=9 which solves it! Boy, I bet my mother would be proud! (By the way, she was an English teacher.) Then I read the others' posts. ugh. I hate when that happens. |
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hughwill
Joined: 05 Apr 2010
Posts: 424
Location: Birmingham UK
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| Posted: Tue Apr 26, 2016 8:23 am Post subject: |
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Thanks for that Don. probably explains what the algorithm was using to
suggest it was a VH. I've noticed that before that there are certain box-line
interactions or triples that the programming fails to spot- in this case could it
be that there are two naked triples (both 137) which share two cells? It's an
unusual combination....
Still, it's hard to complain about something that has worked so well over 10
years- so thanks again Sam (even if he's a largely absent landlord!). |
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