Consider the following premises. Charles is a server if and only if David is playing squash. Thomas is sad if and only if it is snowing. Thomas is not sad. If Charles were a server, then it is late. If it is late, then it is snowing. Can we infer the following from them? David is playing squash.
 From the fact that if Charles were a server, then it is late, and that if it is late, then it is snowing we can infer that if Charles were a server, then it is snowing. From the fact that Thomas is sad if and only if it is snowing, and that Thomas is not sad we can infer that it is not snowing. From the fact that if Charles were a server, then it is snowing, and that it is not snowing we can infer that Charles is not a server. Finally, from the fact that Charles is a server if and only if David is playing squash, and that Charles is not a server we can infer that David is not playing squash, which contradicts that David is playing squash. Therefore, the answer is no.