Before revision:  In this paper, I propose a novel framework and a solution concept: I introduce the recursive backward induction solution in coalitional extensive-form games in which players are free to cooperate to coordinate their actions or act independently  .
After revision:  In this paper, I propose , to the best of my knowledge, the first solution to the long-standing open problem of strategic cooperation first identified by von Neumann (1928). I introduce the recursive backward induction solution in coalitional extensive-form games in which players are free to cooperate to coordinate their actions or act independently .