Please look at the below link.
http://norvig.com/sudoku.html
The tutorial above gives brilliant explanation of how to use Constraint
Propagation with BackTracking to solve every Sudoku puzzle ever.
On Mon, Jan 30, 2012 at 6:46 AM, Don wrote:
> For each group (either a row, column, or square)
For each group (either a row, column, or square) keep track of what
values it still needs.
For each cell, if there is exactly one value needed by its row,
column, and square, assign that value and update the needed values for
the row, column, and square.
Repeat until there is nothing more you can d
