He left the box unprotected.

VOA: special.2009.12.31

And when I threw those away, I was left once again with a little box, and I could do it again, and again, and again.

剔除之后,我得到了更小的方格,我可以一次一次的重复这个过程

耶鲁公开课 - 博弈论课程节选

Probability is 0 of their choosing Right is the same as saying they choose Left, so that my payoff from Up against that is given by the top box up there, I get 5.

如果对手选右的概率是0,其实就是说他们会选左,因此此情况下我选上的收益,从上面的矩阵看,我的收益是5

耶鲁公开课 - 博弈论课程节选

I've deleted all the strategies that were best, that are never best responses for Player I and all the strategies that are never best responses for Player II, and what I've got left is that little box.

我剔除了所有策略,所有非参与人I最佳对策的策略,还有非参与人II最佳对策的策略,最后只剩下了这个小方格

耶鲁公开课 - 博弈论课程节选