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Oct 10 VH

 
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prakash



Joined: 02 Jan 2008
Posts: 67
Location: New Jersey, USA
PostPosted: Sun Oct 10, 2010 4:35 am    Post subject: Oct 10 VH Reply with quote
Eventhough the grid seemed quite full after the basics, an XY wing(279) clears it up completely!
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George Woods



Joined: 28 Mar 2006
Posts: 304
Location: Dorset UK
PostPosted: Sun Oct 10, 2010 12:31 pm    Post subject: or w wing or coured? 7s Reply with quote
79 s in Box 3 and 9 operating on 7s in col 7 give 2 at r2c9 and a solution

OR
a 7 at r3c8 fails (easy to follow as there are so many strong links on 7) Is this called colouring?
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Marty R.



Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA
PostPosted: Sun Oct 10, 2010 3:57 pm    Post subject: Reply with quote
Quote:
a 7 at r3c8 fails (easy to follow as there are so many strong links on 7) Is this called colouring?

I don't know what you had in mind, but I was able to eliminate that 7 by multi-coloring. Simple coloring is a chain of strong links with the chain having an even number of cells so that the start and end of the chain have opposite polarity.

For example, the chain might be true-false-true-false. The start and end cells are T-F. Or reverse the chain and those same two cells would be F-T. Any cell seeing both the start and end cells cannot contain the number.

Multi-coloring is more than one chain with the start cells in the same house. A Skyscraper and Kite are simple forms of multi-coloring.
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cgordon



Joined: 04 May 2007
Posts: 769
Location: ontario, canada
PostPosted: Sun Oct 10, 2010 8:59 pm    Post subject: Reply with quote
If, like me, you want to avoid those tedious wings.

ER on 9

Type 6 UR on 28

and two more ERs on 9

Quite simple really.
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