looks like White is playing the King's Indian Attack, not sure what Black is playing.
If White is familiar w/ the King's Indian defence as black, then similar positions as white can be reached here.
The King's Indian defense or attack is good if you like tactical play.
A) Can anyone tell what the name is of this opening?
B) What is the benefit of this opening?
C) What is the idea (for white) of this opening?
D) What is the idea (for black) of this opening?