A group of chess players compete in a round-robin match. Each player plays a game against all the others. The champion is determined based on points. There are 78 round-robin games. How many players will participate in the round-robin match?
一批象棋棋手进行循环赛，每人都与其他所有的人赛一场，根据积分决出冠军，循环赛共要进行78场，那么共有多少人参加循环赛？
<result>13</result>