Consider the following premises. Susan is making tea if and only if it is raining. Barbara is playing a game if and only if Susan is making tea. It is not raining. Can we infer the following from them? Barbara is playing a game.
 From the fact that Susan is making tea if and only if it is raining, and that it is not raining we can infer that Susan is not making tea. From the fact that Barbara is playing a game if and only if Susan is making tea we can infer that if Barbara plays a game, then Susan is making tea. Finally, from the fact that if Barbara plays a game, then Susan is making tea, and that Susan is not making tea we can infer that Barbara is not playing a game, which contradicts that Barbara is playing a game. Therefore, the answer is no.