It is also possible to choose 4 particular opponents, called ai-tax2, ai-tax3, ai-tax4, ai-tax5. They are the levels of the robot Ai-tax, using the same code than the John Williams Tk Ataxx.
7x7 board, without blocks.
Board codification (and beginning positions, o and x) :
A B C D E F G
1 o . . . . . x
2 . . . . . . .
3 . . . . . . .
4 . . . . . . .
5 . . . . . . .
6 . . . . . . .
7 x . . . . . o
By the same author : E-mail Hexxagon (the Ai-tax robot may also play).