This pink line has to drop off from a all the way to c.

这条粉色的线要经过纵坐标a-c

耶鲁公开课 - 博弈论课程节选

The way we read this graph, is you give me an S2, I read across to the pink line and drop down, and that tells me the best response for Player I.

这个图的作用是,给定一个S2,找到粉线对应的坐标,然后就能找出参与人I的最佳对策

耶鲁公开课 - 博弈论课程节选