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  Topic: XY Chain Interpretation
chriswarren

Replies: 8
Views: 33395

PostForum: Daily Sudoku puzzles   Posted: Fri Oct 01, 2010 6:46 pm   Subject: XY Chain Interpretation
Thanks Marty!

Have finally twigged. The key point in your last link was that the number you elimate from the pincered cell has to be the one that is "unused" in the end of the chain (i.e. ...
  Topic: XY Chain Interpretation
chriswarren

Replies: 8
Views: 33395

PostForum: Daily Sudoku puzzles   Posted: Fri Oct 01, 2010 11:19 am   Subject: XY Chain Interpretation
Hi Marty and Danny,

Many thanks for your help.

I'm obviously missing something. I've reread the sudopedia article - and I still feel that in the example I've given, there are two XY chains i.e. ...
  Topic: XY Chain Interpretation
chriswarren

Replies: 8
Views: 33395

PostForum: Daily Sudoku puzzles   Posted: Thu Sep 30, 2010 6:57 pm   Subject: XY Chain Interpretation
Hi Marty - thanks for the response - but I'm still confused!

Maybe I've got the name of the strategy wrong, but I thought that if you follow a chain of bi-value cells where they always share a digi ...
  Topic: XY Chain Interpretation
chriswarren

Replies: 8
Views: 33395

PostForum: Daily Sudoku puzzles   Posted: Thu Sep 30, 2010 2:05 pm   Subject: XY Chain Interpretation
Trying to solve the puzzle below via XY chains appears to give two answers to R1C4??

Starting from R1C6 -> R4C6-> R5C6->R6C4 -> suggests you can remove the 5 out of R1C4...

...and R1 ...
 
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