4 players compete in the final Go final, and every two players have to play a game. How many games are there in total?
4名选手进行最后的围棋决赛，每两名选手之间都要进行一场比赛，一共要比赛多少场．
<gadget id="calculator">4 - 1</gadget>
<output>3</output>

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

<gadget id="calculator">3 * 2</gadget>
<output>6</output>

<result>6</result>