So the profit is 2 S1 plus S2 plus B S1 S2 minus S1 squared.

利润是2-S1平方

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This is their profit. And I won't tell you what B is for now, but let's just.. I mean I won't tell you exactly what it is, but I'll explain it.

这就是利润表达式,先不讨论B,我是说我们先不讨论B到底多大,我们照常计算

耶鲁公开课 - 博弈论课程节选