Notice the six in the center left 3x3 box, while it does not affect the placement of the six in the center 3x3 box, does require that the six be in the center row of the center right 3x3 box (because the bottom row is already complete). Thus we are left with the two unfilled cells in the left column of this 3x3 box where the six can be placed. But then see the six in the top center 3x3 box precludes the placement of a six in the left column and the two potential sixes in the bottom center 3x3 box form a pointing pair so the six cannot be in the center column of the center 3x3 box.
The center 3x3 box does not have its six filled or possible locations for six marked. The concept of pointing pairs can be extended in many ways. What that tells us for the bottom left 3x3 box is that the only other number not already placed, the seven, must go in the bottom, empty cell because it cannot go anywhere else. Hopefully you see this basic concept, but what does it tell us? If one number must go in one of the top cells and the other number must go in the other top cell (which number going where does not matter), then no other number can go in these two cells. If eight is placed in the top left cell, then the five must go in the top right cell, and if the five is placed in the top left cell then the eight must go in the top right cell. Neither the eight nor the five can go in the bottom cell. Let this sink in briefly, then look at either figure and see how this concept applies here.
Now, because two cells have the same two potential numbers, one number must go in one cell and the other number must go in the other cell. Notice that of the three empty cells, two cells could contain an eight or a five. Take a look at either Figure 3 or Figure 4, we will be focused on the bottom left 3x3 box. Indian Sudoku Championship - November 2010 Monthly.Lets get started with what we can learn from these possibilities.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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