Sudoku Solution Examples
consists of 81 squares divided into nine columns marked a through i,
and nine rows marked 1 through 9. The grid is also divided into nine
3x3 sub-grids named Boxes, which are marked Box 1 through Box 9.
The easiest way starting a Sudoku puzzle is to scan rows and columns
within each triple-box area, eliminating numbers or squares and
finding situations where only a single number can fit into a single
square. The scanning technique is fast and usually sufficient to
solve easy puzzles all the way to the end. The scanning technique is
also very useful for hard puzzles up to the point where no further
progress can be made and more advanced solving techniques are
Here are some ways of using scanning techniques:
1. Scanning in one direction
In our first example we will focus on Box 2, which like any other
box in Sudoku must contain 9.
Looking at Box 1 and Box 3 we can see there are already 9s in Row 2
and in Row 3, which excludes the two bottom rows of Box 2 from
having 9. This leaves Square e1 as the only possible place into
which 9 can fit in.
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