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At the start of the book there is a full description of the different methods used to solve Sudoku puzzles, which describe all of the main techniques required.
One of these techniques - which he suggests, but is not 'required' as other suggest is bifurication - or trial and error. This is where a point is reached where no more options can be seen and so an intelligent guess needs to be made with one of the squares and then either the solution would be reached, or the guess would be proved incorrect, in which case it would be the other choice that would be required. However, this isn't the only technique that can be used to solve puzzles that reach this stage. There are other more difficult techniques which aren't described in the book, and all the puzzles can still be solved by logic alone.
place, causing me to spend many hours writing my own solver
and ending up creating my own online site for playing the game!
It's a good set of puzzles, with ones easy enough to encourage
the beginner and some hard enough to keep you puzzling for
hours.
Dave Cullen
http://www.sudokuoftheday.co.uk
Listmania!
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