banoni

a) the answer to c and d is a puzzle maybe?

b) yes, you are correct. Benoni.

c and d) If the knight moves away, Nc7+, though I'm not sure if it's better than taking the knight straight away. I only analyzed it briefly.

edit: aha! Got it now!

Agh. Missed the mates, but it doesn't matter much here since it's still a won position.

Now that I see Qe5+, which I missed before, it's clear to me that taking the knight is better.

wat is dis??