Consider the following premises. For all x_8, x_8 is a musician if and only if x_8 will play a game. For all x_8, if x_8 sleeps, then x_8 is a musician. There is at least one x_8 for which if x_8 plays a game, then x_8 is sleeping. Can we infer the following from them? If we can, name the inference rule being used: For all x_8, if is not true that x_8 is a musician if and only if x_8 will sleep.
That contradicts the premises. Therefore the answer is no.