## 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.