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.
- First look at the rows, columns, and boxes with the most filled-in
squares. The logic is easier with fewer options.
- 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.
- 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!
- When cross-checking the rows and columns (tip #3), rule out the numbers that are already in the box.
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