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Play Noughts and Crosses

This menu allows you to play the classic game of noughts and crosses (or tic-tac-toe) against Genstat using the NOUGHTSANDCROSSES procedure.

  1. From the menu select Data | Games | Noughts and crosses.

In this game, players take turns placing their symbols (crosses, X, for player 1 or noughts, O, for player 2) until one gets three symbols in a line (a win) or all the squares are filled (a draw). The beginning player has a slight advantage, but the second player should never lose if they play an expert game.

First player (crosses)

This lets you specify who the first player is. The first player uses crosses and the second player uses noughts.

You You are the first player using crosses. (Genstat will use noughts.)
Genstat Genstat is the first player using crosses. (You will use noughts.)

Difficulty level

This selects the level of difficulty in winning against Genstat.

Easy Genstat selects random squares so you should win about 40% of the time, if you start.
Normal You should be able to beat Genstat regularly.
Moderate You should be able to beat Genstat sometimes.
Expert Genstat always plays an optimal move.

Randomization seed

Specifies the seed for the random number generator used for Genstat to make its choice of squares; default 0 continues from the previous generation or (if none) initializes the seed automatically. Setting this to a positive number will give the same game on each run, if you make consistent choices.


Initially Genstat displays the blank grid in the Graphics Viewer and prompts you to choose a square using the QDIALOG directive (as below if you are the initial player).

Move the selection 1-9 to the number of the square you wish to play and click OK. Proceed selecting squares until you win (as below), lose, or the game ends in a draw. At any point you can click Exit to stop the game.


Action Icons

Clear Clear all fields and list boxes.
Help Open the Help topic for this dialog.

See also

Updated on March 28, 2023

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