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Rikthompson
Joined: 25 Jul 2007
Posts: 2
Location: Paignton UK
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 Posted: Wed Jul 25, 2007 11:35 am Post subject: 23 July Hard |
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I am trying hard to master the more advanced strategies but not finding it easy.
I have got thus far
+-------------+-------------+--------------+
| 359 12 235 | 8 4 7 | 1569 156 59 |
| 45 7 8 | 6 9 1 | 2 45 3 |
| 49 14 6 | 5 2 3 | 19 1478 4789 |
+-------------+-------------+--------------+
| 8 3 1 | 2 5 4 | 7 9 6 |
| 2 56 9 | 7 3 68 | 4 58 1 |
| 7 56 4 | 9 1 68 | 3 2 58 |
+-------------+-------------+--------------+
| 456 24 257| 3 8 9 | 156 14567 2457|
|1 9 57 | 4 6 2 | 8 3 57 |
| 346 8 23 | 1 7 5 | 69 46 249 |
+-------------+-------------+--------------+
Can anyone help with the next move(s)? |
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TKiel
Joined: 22 Feb 2006
Posts: 292
Location: Kalamazoo, MI
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| Posted: Wed Jul 25, 2007 11:49 am Post subject: |
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| Welcome to the forum, Rik. The answer lies in Row 3 but don't expect to find something exotic. You must have already done the hard moves. |
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cgordon
Joined: 04 May 2007
Posts: 769
Location: ontario, canada
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| Posted: Wed Jul 25, 2007 6:20 pm Post subject: |
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| There was no need for wings etc here - that would have made this a "Very Hard" - but I thought the necessary TRIPLES weren't that easy to spot. As TKiel alluded to - there was a 49, 14, 19 in Row 3 and a subsequent 78, 58, 57 in Col 9. |
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Rikthompson
Joined: 25 Jul 2007
Posts: 2
Location: Paignton UK
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| Posted: Wed Jul 25, 2007 7:49 pm Post subject: |
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| Thanks folks! Simply did not know about the "Triple pair" strategy, but managed to figure it out from Tracy's clue, and subsequently complete the puzzle. I must have been reading the wrong stuff. Lesson is not to try to run before one can walk. Looking forward to tackling a V Hard now. |
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TKiel
Joined: 22 Feb 2006
Posts: 292
Location: Kalamazoo, MI
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| Posted: Wed Jul 25, 2007 11:42 pm Post subject: |
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| Rikthompson wrote: | | Simply did not know about the "Triple pair" strategy |
Most refer to this as a 'naked triple' (I've also heard it called a locked triple), but it doesn't have to occur in cells in which there are only two candidates. As long as only three candidates appear in three cells that share a row/column/box, it's valid. On the flip side, the candidates [7,8] in that row appear only in the same two cells, which means all other candidates in those two cells can be excluded. These are known as hidden pairs. The end result is the same whether one locates the naked or the hidden. I've always found it easier on the eyes to look for the naked. |
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Asellus
Joined: 05 Jun 2007
Posts: 865
Location: Sonoma County, CA, USA
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| Posted: Thu Jul 26, 2007 8:26 am Post subject: |
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Some nakeds are easier on the eyes than others.  |
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