The game is played according to slightly modified rules. Since the advantage of the first move in tic-tac-toe is obvious, now it is necessary to draw up two adjacent (parallel anyway it will not work) rows. The computer needs to prevent this and make a regular series; at the same time, computer moves randomly, which is logical, since any meaningful move is guaranteed to deprive the chances of winning.

The program algorithm was run in 1989 on the Soviet programmable calculator "MK-52". At the same time, it was transferred to Turbo Basic and demonstrated in the palace of pioneers and the district section of young technicians.

From DOS 2.x, 256 Kb memory, CGA.