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Squiggly VH July 6, 2009

 
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mm01090



Joined: 02 Nov 2007
Posts: 6

PostPosted: Fri Nov 20, 2009 2:42 pm    Post subject: Squiggly VH July 6, 2009 Reply with quote

I have done most of the Very Hard Squigglies, but I am stuck on a few.

After basics and LOL, here is what I have:

+-------------+------------+---------------+
| 9 15 3 | 2 4 7 | 156 16 8 |
| 4 2 7 | 8 6 9 | 15 3 15 |
| 156 156 8 | 15 7 4 | 3 9 2 |
+-------------+------------+---------------+
| 2 8 16 | 167 5 3 | 9 47 146 |
| 3 156 2 | 4 9 156 | 8 16 7 |
| 156 3 9 | 1567 8 156 | 2 47 1456 |
+-------------+------------+---------------+
| 8 4 56 | 3 1 56 | 7 2 9 |
| 7 9 4 | 16 2 8 | 16 5 3 |
| 56 7 156 | 9 3 2 | 4 8 16 |
+-------------+------------+---------------+

The hint puts a '6' in R5C8. Can someone explain why?
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Steve R



Joined: 24 Oct 2005
Posts: 289
Location: Birmingham, England

PostPosted: Fri Nov 20, 2009 6:03 pm    Post subject: Reply with quote

I think I can.

If you run your eye along row 5 you will find it intersects five boxes. Letís call them A, B, C, D and E from left to right.

Now, your diagram makes it clear that 1 occupies row 5 or row 6 in boxes A and D. Accordingly it can be excluded from row 5 in box E.

Steve
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mm01090



Joined: 02 Nov 2007
Posts: 6

PostPosted: Sun Nov 22, 2009 1:32 pm    Post subject: Reply with quote

Thanks. That did the trick.

Is there a name for that type of logic or technique?
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Steve R



Joined: 24 Oct 2005
Posts: 289
Location: Birmingham, England

PostPosted: Sun Nov 22, 2009 8:33 pm    Post subject: Reply with quote

It's usually called "box-line interaction," just as in classical SuDoku.

Steve
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