10 players participate in a chess game, and every two players have to play a game. The scoring method is 1 point for a win, 0.5 points for a tie, and 0 points for a loss. After the game, the players get different scores. And the top two have never lost, the total score of the two is 10 points more than the third place, and the score of the fourth place is equal to the sum of the last four points, so what is the score of the third place?
10名选手参加象棋比赛，每两名选手之间都要赛一场，记分办法是胜一场得1分，平一场得0.5分，负一场得0分．比赛结束后，选手们所得分数各不相同．且前两名都没有输过，二人总分比第三名多10分，第四名所得分数与最后四名的得分总和相等，那么第三名得分为多少．
<result>6.5</result>