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Techniques 2: Very basic techniques and simple questions

Here are some observations I have noticed for solving sudoku's. They are very basic, but it is best to start small, and build up from there.
  1. First look at the rows, columns, and boxes with the most filled-in squares. The logic is easier with fewer options.
  2. When you fill in a square, check the column, row and box. Make sure all the other 8 values will not work in that square. It is easier to avoid mistakes than re-solve the puzzle when you find a contradiction.
  3. Pencil in which numbers are open for each row and column. If a column and row share one number at a blank, there you go!
  4. When cross-checking the rows and columns (tip #3), rule out the numbers that are already in the box.
By Jay_Gray

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