关键词: 影响图, 遗传算法, 私人信息

Abstract: It is important for having the initiative in competition to infer the rival’s private information accurately in the competition.The rival’s decision-making model is described by Influence Diagrams（IDs）.According to the criterion that rival is apt to gain the maximum expected utility in whole multi-steps decision rather than gain the maximum expected utility just in each of the decision steps，the rival’s private information about cost，bankroll，tactic，and utility can be inferred through the observation on rival’s decision behaviors and using the Genetic Algorithm（GA）.The experimental results show that proposed method is both accurate and reasonable.

Key words: Influence Diagrams（IDc）, Genetic Algorithm（GA）, private information