In this puzzle column c (highlighted) has seven numbers allocated.
This is different to the 'single possibility' rule where we looked at individual squares rather than groups. You are left with an only square within a group for a number to go in. For example if a group has seven squares allocated with only two numbers left to allocate it is quite common that an intersecting (or shared) group forces a number to go in one of the squares and not the other one. 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. Indian Sudoku Championship - November 2010 Monthly.When you look at individual squares you often find that there is only a single possibility remaining.Solving Classic Sudoku: 'Single Position'.Indian Puzzle Championship - November 2010 Monthly.Indian Sudoku Championship-Monthly Tests (19).Indian Sudoku Championship-Mock Tests (18).Indian Puzzle Championship-Monthly Tests (19).I have named all the techniques, for consistency and convenience, which may differ from what you know.Įnjoy and look for more techniques coming soon! Technique 7: Hidden Pairs/Hidden TripletsĮvery puzzle has its own techniques but you may find some similarity between similar puzzles like Loop Puzzles, Connection puzzles, etc. Most sudokus (apart from irregular ones) are in the standard classic form, so the techniques of solving a classic sudoku apply to other sudokus with 3x3 boxes too.
If you want some solving techniques of a particular puzzle, you may ask here and I will try to post some tips :-)
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Below is the list of solving techniques that I have posted till date.įeel free to comment and give me feedback. I will post some solving techniques of common puzzles and sudokus and then move on to other more complex ones. I have decided to start sharing some solving techniques. With a lot of people asking me questions like 'How do you solve this puzzle?', 'Are there any tricks in solving this sudoku?', 'How do players solve so fast?', etc.
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