Cell

The smallest component of the puzzle, there are 81 of them and when completed each cell will contain one of the digits 1 to 9.

Square

One of the 9 parts of the puzzle which in turn consists of 9 cells. I will refer to the top left as number 1 square. Moving left - 2 and 3,

Middle squares from left 4, 5 and 6. Bottom squares 7 and 8, finally 9 in the bottom right.

Grid

The puzzle consisting of 81 cells or 9 squares (or maybe just call it the puzzle?).

Candidates - one of the digits that can potentially be placed in a cell to solve the puzzle.

Fulfil - a candidate that can be confirmed as the only digit that can be placed in a particular cell to solve the puzzle in question.

Technique - One of the three techniques I have suggested to enable the solving of an 'Expert' puzzle.

RTR Sudoku

The Sudoku Puzzle programme written by R .T. Russell and M. G. Marten (for BBC BASIC running on Microsoft Windows, see Some Links...).

 

Longitude & Latitude (L&L) The basic technique of using rows and columns to identify candidates and hopefully fulfils in a given square