there are a number of multiple approaches and techniques you can use . One of the more well known approaches is known by to as the multi line sudoku strategy.
in a lot of ways it is very similar to the to double pairs but it is a lot more complex to notice when your playing the game.
candidates in this strategy can be spread out around the two of the different spots on your puzzle board with a possibility that more than one possibility can be realized in each line.
If it sounds confusing feel good because it is in many ways, however many techniques for solving a sudoku seem that way when you begin. After you have completed many puzzles they seem much easier to understand. Just concentrate and try to get your head around it and it will be a resource to help you when starting a sudoku.

