1. e4 c5 2. Nf3 d6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 Nc6 6. Bg5!? a6!?. The best source I've found on this is FIDE Chess B60-65, 1997, pgs 11 to 14. twenty years old. This is indeed a well forgotten line.
There are several alternatives. FIDE Chess answers 7Be2 with Bd7 leading to equality. But I like 7Be2 Qa5. Not mentioned is 7Bc4. Here to black can play 7...Qa5. FIDE Chess analyzes 7Nb3 to equality. In general moves line Nb3 or Be2 seem non-critical in the Richter-Rauzer (RR). 7f4 is interesting. FIDE Chess gives 7...Ng4! as their favored line. They also consider 7...Qb6 slightly better for white (I'm not sure), and 7...Bd7 equal (again I'm not so sure).
FIDE Chess devotes 29 (!) columns to 7Bxf6 gxf6. Most RR players have come to grips with this revised pawn structure and are too scared. After 8Bc4 Qb6 9Nde2 g6 or 9...Qxb2, we get interesting positions. I have not evaluated this personally, but SF initially favors black. Many columns are devoted to 7Bxf6 gxf6 8Be2. Again, I don't think Be2 and 0-0 ideas are too dangerous for black. There is also 7Bxf6 gxf6 8Nb3. Again, a retreating move like Nb3 does not seem to critical, although there is nothing wrong with white trying it out.
7Bxf6 gxf6 8Qd2 seems like the right RR way for white to play, given that he traded on move 7. Here, somewhat surprisingly for me, FIDE Chess finds equality for black in each of the four columns examined.
Saving the best for last: 17 columns on 7Qd2 Nxd4 8Qxd4. FIDE Chess examines 8...e5 and 8...Qa5. 8...e5 9Qa4 seems to favor white.
7Qd2 Nxd4 8Qxd4 Qa5. On move 9, Bd2, f4, and Bxf6 are considered. FIDE Chess only claims an advantage after Bxf6. Personally, I'm a skeptic of the un-prompted Bxf6 in the Rauzer unless, so perhaps white should re-consider 9Bd2 9f4 and also 9Qd2.
Two columns for 7Qd2 Nxd4 8Qxd4 Qa5 9Bxf6 gxf6 100-0-0 Rg8 11Kb1. Here black FIDE Chess continues with 11...f5, but black has move 11 alternatives, e.g. Bg7 Bd7 and Be6. After 11...f5 12Nd5 Be6 13exf Bxf5 14Bc4 FIDE Chess says white has the initiative. Stockfish rather prefers black after 14...Rg4.
Considering the many, many satisfactory lines in the Classical Sicilian, the only question that remains is: Does "best play" give white the advantage? As far as I can tell, the answer is no.
There certainly is some theory on the Classical Sicilian, but I think there is even more theory in the Najdorf, Dragon, and other lines. So, all in all, I think the Classical Sicilian is worth playing to get your opponent on his own in a relatively solid, but still unbalanced line.
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