"I had to come back to this after being stumped the first time. At last I found the conjugate chain in 4 -- B7-D7-D3-C3 which eliminates candidate 4 in B1. Solution is straightforward thereafter." more
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About conjugate chains -- and very difficult sudokus in general
by David Cummins
August 07, 2009 04:08 PM EDT 
Is There a Logical Way to Solve This Puzzle? {Yes -- See Comments}
by Robert Mack
August 31, 2008 02:31 PM EDT | comments: 5 Recent Photos
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Aug 06, 2009 1:30PM EDT
 David Cummins commented on a post Aug 03, 2009 5:18PM EDT
David Cummins commented on a post "In general ... no. Symmetry is simply a convention that some publishers follow and others do not. If you look at the LA Times sudoku puzzles they are often not symmetrical." more Aug 03, 2009 8:20AM EDT
 Robert Mack commented on a post "I'm not familiar with conjugate chains, David. I'd be interested in a post that explains this, as I think other members would also. Bob" more Jul 31, 2009 4:07PM EDT
David Cummins commented on a post "Bob. Are you familiar with conjugate chains (aka colors)? From your stuck point there is a conjugate chain in 5 that goes F4-G4-G6-A6-A2-B3 and eliminates 5 as a candidate in F3. So F3 must be a 7, and . . ." more Conversation Space
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