Lowenthal-LabourdonnaisSicilian Kalashnikov Variation I have been studying the Kalashnikov Sicilian:


e4 c5
Nf3 Nc6
d4 cxd4
Nxd4 e5 (signaling the Lowenthal variation)
Nb5 d6 (d6 signals the Kalashnikov variation)


I have two books I have been studying that cover variations from this point forward. However, I spend a lot of time analyzing my openings and a line that comes up over and over again is 


Bg5!?


The book Neo-Sveshnikov by Silman "covers" this line with one brief note about it on the last two pages of the book. The other book I am studying "Sicilian Kalashnikov" by Jan Pinski, Jacob Aagaard which I really like does not cover this move AT ALL.

Can anyone recommend a resource for me to read about the Bg5 continuation of this line? I find it hard to believe that it can be used somewhat commonly in GM level games and not discussed in any opening books.
This has been one of my main two openings since it became popular in the 1980's again. With strong computers today, they say, and I agree with them, that black is virtually winning after the following line:

  [fen ""]

 1.e4 c5 2.Nf3 Nc6 3.d4 cxd4 4.Nxd4 e5 5.Nb5 d6 6.Bg5 Qxg5 7.Nc7+ Kd8 8.Nxa8 Nf6 {already -2.05 on Stockfish} 9. Nc3 Nd4! 10. h4 {best per four engines} (10. Qd2 Qxd2 11. Kxd2 b6) Qf4 11. g3 (11. Bd3 Be6 {and there is still nothing to stop the roundup of the Na8.}) Qf3 12. Qxf3 Nxf3 13. Kd1 {is given as best, and the Na8 soon falls.}


It is clear that black's development combined with his soon-to-be material advantage (Na8 falls), makes this winning for black, and there really isn't even much counterplay to make it interesting.

The problem earlier is that the Qg5 is very actively posted, e4 is weak, and the move Nc6-d4 is not only keeping the white queen from being active due to c2 being weak, but it blocks white from getting at many critical weak squares like d5, d6, and the d8 square where the black king is.