chain rule

Advanced methods and approaches for solving Sudoku puzzles

chain rule

Postby zr1skydiver » Thu Dec 06, 2007 6:25 pm

I was looking at a solution for a sudoku puzzle that was provided to me on the internet.

One line had the following:

"removing 3 from [A5] using chain rule (method D)"

Anyone know what the chain rule is and where I could find a detailed description of what it is?
zr1skydiver
 
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Postby Mike Barker » Sat Dec 08, 2007 3:06 am

I googled "Chain rule method D Sudoku". This is not standard terminology, but one possibility is that it is just a naked set (pair, triple, etc). The reference is:

http://www.sudokusolver.co.uk/solvemethods.html

If you still have a question, feel free to post the puzzle.
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Postby Ruud » Sat Dec 08, 2007 11:20 am

When you run the example in the online solver it gives these hints for naked subsets:
sudokusolver.co.uk wrote:.. removing 7 from [D3] using chain rule (method D)

See also: Number chain definition in Gaby's dictionary.

Ruud
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