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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.

Click here to share your Sudoku solving strategies!

Click here to read what others have contributed!

Sudoku Strategies

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.

Applying Logic

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?

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What Other Visitors Have Said

Click below to see contributions from other visitors to this page...

Coupled Pairs  starstarstarstarstar
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 ...

My Visual Sudoku Strategy  starstarstarstarstar
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, eventually ...

Chain  starstar
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....

The Numbers In Order  starstar
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 ...

Not In My Hood( 3x3 Square) - or - The Reject List  Not rated yet
Recently, My wife asked me to find a computer program so that she could play the game on her home computer. As her computer is not Intel x86 based, I ...

Check Empty Cells In A Row Or Column By Process Of Elimination  Not rated yet
If a row has three empty cells, look at the columns of the empty cells of that row. If either column contains two of the three missing numbers, then the ...

Dots  Not rated yet
In the cell I put a dot for 1 2 3

4 5 6

7 8 9

When ...

Easy Two Number Referencing  Not rated yet
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  Not rated yet
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  Not rated yet
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.

For ...

Process of elimination using Dots instead of Numbers  Not rated yet
Process of elimination using Dots instead of Numbers.

When you are putting possible numbers that can be in a square. Use Dots instead.

No need to ...

Solving Sudoku Puzzles  Not rated yet
LABELING

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 ...

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