Consider the following premises. For all x_6, if x_6 plays a game, then x_6 is a server. For all x_6, x_6 is not a server. Elisabeth is playing a game if and only if it is windy. Can we infer the following from them? If we can, name the inference rule being used: It is not windy.
 From the fact that for all x_6, if x_6 plays a game, then x_6 is a server, and that for all x_6, x_6 is not a server we can infer that for all x_6, x_6 will not play a game via universal modus tollens. From the fact that for all x_6, x_6 will not play a game we can infer that Elisabeth is not playing a game via universal instantiation. Finally, from the fact that Elisabeth is playing a game if and only if it is windy, and that Elisabeth is not playing a game we can infer that it is not windy via biconditional elimination. Therefore, the answer is yes.