In a table tennis invitational tournament held in a certain city, there were three professional players and three amateur players participating. The game is carried out in a single round-robin manner, that is to say, every two players have to play one game. For the sake of fairness, use the following method to score. Before the start of the game, each player has 10 points as the bottom score. In each game, the winner will add points, and the loser will deduct points. 2 points are added for each game won by a professional player, and 1 point is added for each game won by an amateur player; 2 points are deducted for each game lost by a professional player, and 1 point is deducted for each game lost by an amateur player. Now ask: How many games does an amateur player have to win at least to ensure that his score is higher than that of professional players?
在某市举行的一次乒乓球邀请赛上，有三名专业选手与三名业余选手参加．比赛采用单循环方式进行，就是说每两名选手都要比赛一场．为公平起见，用以下方法记分．开赛前每位迭手各有10分作为底分，每赛-场，胜者加分，负者扣分．每胜专业选手一场的加2分，每胜业余选手-场的加1分；专业选手每负一场扣2分，业余选手每负一场扣l分．现问：一位业余选手至少要胜几场，才能确保他的得分比专业选手为高？
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