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Unique Candidate Technique Explained
Submitted By: Gath from Sudoku.com.au
This is another simple technique - sometimes also called 'Hidden Single'. Basically, If a cell is the only one in a 3x3 block , column or row that can take a particular candidate (number), then it must be that candidate.
This follows on from the general rules that each 3x3 block, column and row must have the numbers 1-9. Check out this example:
 The middle 3x3 block must have a 9, but it can't be in the top 2 rows. That leaves the only other vacant cell - that must be where the 9 goes. Cheers, Gath |
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