CarriedbyGg wrote on 05/20/17 at 13:28:44:
Kozuls book is written by the expert on the line and contains not only numerous novelties and interesting variations, but also a lot of positional advice. However, as stated above, you can only read this book without going crazy if you type it into chessbase.
Second thing is that it requires a certain playing strength (I would assume 1900+)
Third, this only covers the Bg5 Rauzer! For everything else, there are other things:
First, Marins DVD. Cannot comment on that.
Second, Yermolinskys book, which I really like! Definitely worth the money and I think you get it cheap these days. Also covers other interesting lines in the Rauzer.
There is also another DVD by Kosten I think, which is also quite decent.
So, Kozul for the Kozul and Yermo for the rest probably!
Yermo's book is a terrific collection of annotated games and his opinions, as a very strong exponent of the Classical, are astute and still largely relevant.
Raetsky & Chetverik is their usual competent job but this book didn't inspire me.
Wells & Osnos remains a good source for earlier theory.
As I've mentioned before, my own explorations of the Classical began with "The Easy Guide to the Classical Sicilian" by the Finnish GM Jouni Yrjölä, which would still be my top recommendation for any 1900+ player keen on taking up this opening. The explanations are very good and there is a nice balance of theory and annotated games. Obviously the detailed theory needs some updating but it's very user-friendly and a great place to start.
Kozul's book was a huge disappointment - I find it very hard to use.
Kosten's Chessbase CD did not cover 6 Bg5 but remains useful for other lines.
Marin's DVD - like Bibs, I was initially rather put off by his annoying speech mannerisms, but the material seems very well considered and I'd say it is well worth persevering!