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**Using Colors**

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 …

**Coupled Pairs**

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**

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, …

**Chain**

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**

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 …

**All Candidacies of # w/in Region Alligned =**

Though likely written somewhere in this site already:
Two or three of the same candidate forming a line in a region eliminates that candidate as a possibility …

**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, …

**Not In My Hood( 3x3 Square) - or - The Reject List**

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**

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**

In the cell I put a dot for 1 2 3
4 5 6
7 8 9
When …

**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.
For …

**Process of elimination using Dots instead of Numbers**

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**

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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