In the above game, \(A\) can either exit the game initially (by choosing \(e\)) for a guaranteed payoff of \(2\) or decide to play a game of imperfect information with \(B\). Notice that \(r_1\) is strictly dominated by \(e\): No matter what \(B\) chooses at \(v_3\), \(A\) is better off choosing \(e\). This means that if \(A\) is following a rational strategy, then she will not choose \(r_1\) at \(v_1\). According to the rationalizability principle, \(B\) is disposed to believe that \(A\) did not choose \(r_1\) if he is given a chance to move. Thus, assuming that \(B\) knows the structure of the game and revises his beliefs according to the rationalizability principle, his only rational strategy is to choose \(l_2\) at his informational cell (consisting of \(\{v_2, v_3\})\). If \(A\) can anticipate this reasoning, then her only rational strategy is to choose \(e\) at \(v_1\). This is the forward induction outcome of the above game.