Tic Tac Toe

I think i don't need to introduce rules, because who didn't play tic tac toe at least once? If there is person, who never heard of it, quick explantation: Play area is a 3x3 game table. So basically you choose X or O as you sign. Then you need to place it each other to fill one entire row  or  one vertical side  or just cross your signs on diagonal sides. But your opponent also has the same purpos…