12/27/2023 0 Comments Solving sudoku puzzlesThe 3,4,6, and 8 quads are really “hidden pairs”. In the naked pair example, it is safe to eliminate the four and six from the two quads of 3,4,6, and 8. When you see a naked pair, it is safe to eliminate those two numbers from all other cells in the row, column, or region the pair reside in. This combination of candidates will occur often also. A naked pair is two identical candidates in a particular row, column, or region. In the example to the left there is a “naked pair”. When there is a lot of candidates showing from the surrounding rows, columns, and regions, a hidden single can be hard to spot. Likewise in the bottom cell the only number that can go there is a four. In this example, the third cell from the top is a seven. The extra candidates in the cell “hide” the single solution. Hidden singles have only one place they can go. In the example at the left there are two hidden singles. Below is another example of a hidden single. 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. If you didn’t pencil in all the possible candidates, the naked nine would be less obvious. 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. In the example to the left, you can see the naked single is the nine. If there is one cell that contains a single candidate, then that candidate is the solution for that cell. If there aren’t any other candidates showing, Sudoku players call this a naked single.Įvery 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. Sudoku Tips -Naked Single CandidatesĮvery Sudoku puzzle will have cells that have only one possible candidate. In these cases use my free blank grid with candidates worksheet. The paper version, board games, and handhelds usually lack this capability. Some online puzzles allow you to pencil in your candidates. Some Sudoku computer programs have the option to show you all the possible candidates. 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. I prefer to use the process of elimination to solve Sudoku. 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. There are two ways to approach the Sudoku Solving process. To solve the hardest puzzles and games, use advanced strategies such as X-Wing, XY-Wing, and Swordfish. Apply these Sudoku tips and you will solve most Sudoku puzzles. It may seem impossible to you to solve anything but the most simple Sudoku puzzles. Sometimes there are no steps at all, just try to understand the game, focus on the goal and enjoy the challenge.When you begin to play Sudoku, you probably will have moments when you reach a roadblock. Is the most difficult technique because it is more difficult to spot it. This method can work when you look at cells comprising a rectangle, such as the cells marked in red. Step 3Īnalysis (almost, I Think) this one is almost like the candidate elimination and it is also called deriving certainty from uncertainty. The candidate elimination method happens when a pair of numbers are the only possible answer to two cells. Analysis consists of two methods namely candidate elimination and the what if. If there is just one number missing then that’s what should be in the cell. In counting you simply count all the different numbers that's in a row, column and region that connects to one cell. You scan rows and columns to eliminate where a specific number can be in a given region. Solving the Sudoku Puzzle sometimes can get really hard and challenging, but here are some steps to follow that can help you become faster and more efficient while playing this game.
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