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Sudoku:solving it for beginners and the expirienced

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Step 2: The basic basics(scanning)

I most basic strategy to find missing numbers is scanning and it consists of
1)Cross-hatching.
2)Counting.

1) Crosshatching (shown in the first picture). You scan rows and columns to eliminate where a specific number can be in a given region.As you can see there is only one legal place left for the 1(marked green).

2)Counting. In counting you simply count all the different numbers that's in a row,column and region that connects to one cell. if there is just one number missing then thats what should be in the cell. Take a look at the second picture and see if you can figure out the missing number in the green cell.

the correct answer is :4

legend: green = result
red = cause(the cause of the result that is)
 
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