There are nine players in a table tennis match. Every two players have to play one game. Each game will win 3 out of 5 games. The score will be calculated according to the number of games won by both sides. If one side wins 3 games and the other side wins 1 game, the score will be 3:1, then at least how many games have the same score.
九名运动员进行乒乓球比赛，每两名运动员都要赛一场，每场比赛5局3胜，比分按双方各自胜的局数计算，如一方胜3局，另一方胜1局，比分为3：1，那么至少有多少场比赛的比分相同．
<gadget id="calculator">9 - 1</gadget>
<output>8</output>

<gadget id="calculator">8 / 2</gadget>
<output>4</output>

<gadget id="calculator">9 * 4</gadget>
<output>36</output>

<gadget id="calculator">36 / 3</gadget>
<output>12</output>

<result>12</result>