xela: Yes, but this isn't an enclosure, and I don't think you'll find it in that book. Normally white would play around a before jumping to .
tapir: I simplified a bit from the real game, it wasn't 9-3 and 9-5 but similar strength, say the strength evolved naturally :)
Bill: I am more at home making frameworks than invading them, but here are some thoughts.
Bill: I do not feel that this puts enough pressure on the stone. I would rather see at "a".
Bill: But really, Black has several ways to play the corner. So my inclination would be to leave it as is and play first.