Originally posted by YUG0slavTrue. Even if somehow White's attack fails, he's got a good position and he's DEFINITELY going to win two pawns for the bishop, plus he's already up an exchange, so he's not going behind in material. Basically with Bxg6 White says "You can have the material back, but I get a big attack for it". If Black DOESN'T take the sacrifice... well, I don't think the game lasts too long down THAT route.
why give him time to regroup?