![]() ![]() Often you will find that within a group there is only one remaining place that can take a particular number. To use this technique you choose a promising square and mentally run through each number in turn that might go in it, if you are left with only one number then that number must go in the square.įor a further in-depth guide click here Only square Sudoku rule The single possibility rule can be used to solve all the puzzle squares highlighted in green, so that makes it a very useful technique to have up your sleeve. But in row D there is already a 6 and 9 so that leaves 7 as the single possibility for square Da. Look at the purple square Da and run through possibilities: 1 2 3 4 5 and 8 that are allocated in column a leaves only 6 7 and 9 as possibilities. In this partially solved Sudoku there are quite a few readily solvable squares. So there is only one possibility for that square, and the number must go there. Because groups intersect you often find groups with more than one unallocated square but only one genuine possibility exists for one of the squares. ![]() Note: If there are eight squares solved in the group then this is just the same as the only choice rule. When you look at individual squares you often find that there is only a single possibility remaining. ![]()
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