Share Your Sudoku Strategies!
Sudoku strategies begin with knowing where to start, what to look for, and applying logic. Read about my strategies and then share yours.
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Where To Start
Many beginners, when faced with a Sudoku puzzle, often wonder where do I start? I usually begin by methodically
scanning the puzzle
for each number, one through nine.
When I see multiple givens of the same number, I then slice and dice and see how many cells I can solve. This is a good way to find single possibilities for a given cell.
Sometimes I may not be able to solve a cell because there are two possible locations in a row or column. I can use these two cells to eliminate any candidates in the same row or column that have the same number.
Other times I use a pair of numbers in the same row or column in conjunction with givens in other rows, columns, or regions, to place candidates in another 3x3 region. This way I am effectively removing possible candidates without ever writing them in.
What To Look For
After penciling in candidates in a row, column, or region, I begin looking for patterns beginning with the easier ones and then progressing to the harder ones.
I first look for pairs or triples of candidates. Then I progress to harder patterns such as X-Wing, Swordfish, XY-Wing and so forth.
After spotting a pattern, then I use a little logic to help me solve the Sudoku puzzle. This gets fun when you can use logic to break a chain or eliminate candidates from cells.
This is just a beginning of Sudoku strategies. Why not share your tactics to solving a Sudoku puzzle? Show off your skills and be recognized as a Sudoku Pro. Help and be helped.
What Is Your Favorite Sudoku Strategy?
Do you have a great Sudoku strategy? Share it! Write a 300 word article that explains your strategy. Use proper English and sentence structure.
What Other Visitors Have Said
Click below to see contributions from other visitors to this page...
The Intersecting Value
If in a given row a certain number is determined to reside in a certain 3x3 block; and furthermore, that same number for a given column must also reside …
Double Square Logic
In a Sudoku puzzle, if a number can contain only in B1, B2, A5, B5, that number must be inserted in A5.
Row of 3
Suppose you have solved three cells in a row (or column) within a region. (Rows with letters, from top; columns with numbers from left.) For instance, …
First I use Orange to mark the start of color mapping,in this example the candidate is (1).
- Find a column or row where the candidate is assigned only …
Rule of Two
For difficult puzzles, I've adopted what I call the Rule of Two. Simply put: no cell should ever have more than two numbers it. Using numbers that default …
To use the chain strategy, pick a box with only 2 candidates that you would like to solve. Now imagine that the answer to that box is the first candidate. …
In the cell I put a dot for 1 2 3
4 5 6
7 8 9
The Numbers In Order
I am not 100% sure this is the way to go, but look at the square. Is there a 1? If there is not, then look at each row for ones.
The rows that do have …
Easy Two Number Referencing
Whenever you have only 2 candidates in your cell, look for couples, triples and quads that go with that cell. When writing the candidates in your cells, …
Forbidden Double X-wing
When you see in two 3*3 squares a pattern that looks almost a double X-wing, you are certain a double X-wing there is forbidden because then there would …
The Ninth Number Of The Grid
When you have 8 of the same number in any combination of 8 of the 9by9 squares, you can always put the ninth number using the scanning method.
While I use all the methods you give, one of my favorites (which I have not seen in print yet) is to use "coupled pairs" of numbers. The major drawback …
Solving Sudoku Puzzles
Across the top label the large squares A, B, C and down the left side D, E, F. Generally the bottom and right side don't need to be labeled …
My Visual Sudoku Strategy
I like Sudoku strategies that are simple and logical for me. I like solving Sudoku puzzles without using candidates, if at all possible. In reality, …
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