by Colleen Atradley
(lkwd, co usa)
In the cell I put a dot for 1 2 3
4 5 6
7 8 9
When I look at a cell a know what numbers are available.
. x x
x . x
x x x
1 and 5 will fit
I scan rows then columns for gimmes
I use the other strategies and if needed I know all the values possible for each cell, for each row, for each column.