What Solving Techniques does SadMan Sudoku Use?
SadMan Software Sudoku uses the following solving techniques (text in brackets indicates alternative names):
- Naked single (singleton, sole candidate)
- Hidden single (unique candidate)
- Block / column / row interactions (pointing pair)
- Block / block interactions
- Naked pair, triplet and quad (naked subset, disjoint subset)
- Hidden pair, triplet and quad (hidden subset, unique subset)
- X-Wing
- Swordfish
- XY-Wing
- XYZ-Wing
- XY-Chain
- Colouring
- Forcing chains
- Trial and error (Ariadne's thread, backtracking, guessing)
See also in what order does SadMan Sudoku use the various solving techniques?
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| What People Say |
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 Thank you so much for one of the best conceived and executed programs I have ever seen. It is both complete and perfect. I can't imagine what could be added.  Robert LaFortune, Michigan |
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