Sudoku Website - As Promised
Varun Gupta
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Hi,
Thanks for such this could you please make understand the sudoku i know the rules & abt this but everytime i don't able sort it out........
Tx
Varun Gupta
Well I have some good news. Apply these Sudoku tips and you will solve most Sudoku puzzles. To solve the hardest puzzles and games, use advanced strategies such as X-Wing, XY-Wing, and Swordfish.
There are two ways to approach the Sudoku Solving process. You can use logic retaining in your memory the possible candidates for each cell, row, column, and region or you can write the candidates down.
I prefer to use the process of elimination to solve Sudoku. This leads me to my first of several Sudoku tips and that is pencil in all the possible candidates for each cell, row, column, and region.
Some Sudoku computer programs have the option to show you all the possible candidates. Some online puzzles allow you to pencil in your candidates. This makes life a little easier. The paper version, board games, and handhelds usually lack this capability. In these cases use my freeblank grid with candidates worksheet.
Naked Single Candidates
Every Sudoku puzzle will have cells that have only one possible candidate. If there aren't any other candidates showing, Sudoku players call this a naked single.
Every naked single allows us to safely eliminate that number from all other cells in the row, column, and region that the naked single lies in. The logic is simple. If there is only one cell a number can go in, then it can't go anywhere else. Below is an example of a naked single.
In the example to the left, you can see the naked single is the nine. All the other nines may be crossed off leaving a 6,8 pair, 6,7 pair, a single 7, and a 4,6,8 triple. If you didn't pencil in all the possible candidates, the naked nine would be less obvious.
No doubt you also noted in this example that once you solved for the naked nine, the 7,9 pair's solution became a naked single. The 7,9 pair is called a hidden single. Below is another example of a hidden single.
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Enjoy !