Consider the following premises. For all x_11, x_11 will play squash if and only if x_11 is rich. There is at least one x_11 for which if x_11 plays squash, then x_11 is playing tennis. For all x_11, if x_11 plays tennis, then x_11 is rich. Can we infer the following from them? If we can, name the inference rule being used: For all x_11, the fact that x_11 plays squash does not imply that x_11 is rich.
That contradicts the premises. Therefore the answer is no.