i call it the Rossolimo Grand Prix since u mix both.
Tiviakov is the main advocate of this and this is very highly seen from a theorical point of view.
A chapter has been made on this in a book "experts on the anti-sicilian".
U can also purchase the excellent Starting out Grand Prix attack by Gawain Jones or even better, from the same author, The killer Grand Prix, a very nice DVD where he focused more on this opening and move order, connected with playing GP attack of course.
In general, playing GP attack and closed sicilian is very good because u can switch according first moves played by black and your preferences.
For instance, some prefer playing closed sicilian after 1.e4 c5 2.Nc3 e6 with 3.g3, instead of 3.f4 where u have to play some strange variations, like the weird Toilet variation ^^
I was looking for good and not very well known antisicilian.
Following the advice of John Emm´s Book "Attacking with e4 and other videos that I have seen, I was going to adopt the closed sicilian . (Nc6, 2g3..) at least when whites plays 2Nc6, or 2e6 because according to what I have read or seen to some GM a good line, solid and difficult to fight against it, and easy to play at "Not high levels" for those who does not want spend so many time studing the open sicilian.
And as a Siclian player I see that I do not usually find that white plays it, so that is a good thing, for not being so usual.
When I was almost sure of my decision I found this other anti sicilian 1Nc3 2Bb5, that seems to have no specific name, at least I have not found it. The stats that I have seen in the game explorer are shocking because it has almost as good stats as the open Sicilian, and seems interesting with variations similar to Rossolimo or GP attack in some cases and may be more direct.
Whant do you think of it?, better to spend time on the Closed Sicilian or on this (no name) variation
Thanks and regards,
PS: if white plays 2d6 I have no doubt I like the Grand Prix Attack, but this do not usually happens, that why I was looking for an alternative for the other cases