Definitions

Here is a list of terms used throughout this website and also in the help panels of the SuDoku Solver.

Square

A single square in the SuDoku which may contain one of the numbers 1 to 9.

Grid

The whole SuDoku, made up of 81 Squares arranged in a 9 x 9 grid.

Row

Nine adjacent horizontal Squares in which the numbers 1 to 9 each occur only once.

Column

Nine adjacent vertical Squares in which the numbers 1 to 9 each occur only once.

Box

Nine Squares arranged in a 3 x 3 grid in which the numbers 1 to 9 each occur only once. There are nine Boxes in the whole SuDoku Grid.

Segment

Three adjacent Squares arranged either horizontally or vertically that are all in the same Row and Box, or in the same Column and Box.

Solution

In a correctly completed SuDoku, the Solution for each Square is the number in that Square.

Possible

The possible solutions for each Square. Initially, all the numbers 1 to 9 may be Possibles in a particular Square until they are eliminated by the action of various Analyses. Eventually there is only one Possible left and that becomes the Solution for that Square.

Pair

A Square which has only two remaining Possibles. The starting point for the Splits Analysis.