Quote Originally Posted by Pic_User View Post
How much experience do you have with tic tac toe?
That's a very good question that Adam has asked. You can't possibly expect to design an expert system unless you're an expert in what you're attempting to "mimic". I strongly suggest that you first proceed to master the game. Have someone play against you with pen & paper and when you can say that you can either win or draw every time, then you know it's time to start the project.

Best of luck with it!