There is a great need to find new topics which are good to evaluate and to encourage the mathematical creativity of gifted students, For the purpose to find such a topic, we study Ho-bak-go-nu game that is one of Korean traditional games and a typical alignment game. By analyzing patterns of possible alignment, the author gives a complete solution to win or not to lose according to the rules chosen by players. The author also poses several class-models including a test for the class of gifted students based on the analysis of real classes on Ho-bak-go-nu game.