  The main challenge of combinatorial game theory is to handle combinatorial
chaos, if one player knows the strategy better than his opponent, he is able to
determine the exact results of a game. If both players are qualified
competitor, the result usually depends on the order when they take turns, which
however, may not be determined by a player casually. So, this research studied
different kinds of tic-tac-toe, assuming that a player always moves first,
tried to figure out the winning or unbeatable strategy for the first player in
different kinds of tic-tac-toe. It is titled "Move first, and become
unbeatable", which also reflects the philosophy in life.
