The sixth grade held a table tennis competition. A total of 12 students participated in the knockout round. The loser will not participate in the next round of competition. How many games will be played until the first place is determined.
六年级举行乒乓球比赛，共有12名同学参加，两人为一组进行淘汰赛，失败者将不参加下一轮比赛，如此下去决出第一名为止一共要比赛多少场．
<gadget id="calculator">12 - 1</gadget>
<output>11</output>

<result>11</result>