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EXTENSIVE GAMES WITH IMPERFECT INFORMATION We introduce the concept of an information set through three examples. Example 1. The strategic form of the BoS game is given by (2,1) (0,0) (0,0) (1,2) . In the matrix the ﬁrst row and ﬁrst column are B and the second row and second column are S. We can give this game in extensive form as in Figure 1.