TicTacToe, fun game for dueling!
When you're the first one up, there is a simple strategy on how to win tic tac toe. Put your X in any corner. Believe or not, this move will pretty much send you to the winner's circle every time, so long as your opponent doesn't put their first O in the center box. This can make it harder to win, but it can happen.
Enjoy the game.