TN wrote on 07/21/11 at 12:05:01:
And here is a sample Open Sicilian repertoire for a 1900 player. I've intentionally offered different suggestions to MNb to show that there is more than one way to pick up the Open Sicilian and do well with it.
Najdorf: 6.Be3, meeting 6...e5 with 7.Nb3 followed by Qd2, 0-0-0 and f4 and 6...Ng4 with 7.Bg5 h6 8.Bh4 g5 9.Bg3 Bg7 10.Be2.
Scheveningen: 6.Be3 followed by Qd2/f3/0-0-0/g4, i.e. the English Attack. You can dodge a lot of theory in the main line with 6...a6 7.Qd2 b5 8.f3 Nbd7 9.g4 h6 10.0-0-0 Bb7 11.h4 b4 12.Nce2 instead of the critical 12.Na4. The reason I recommend the English Attack is because it is very easy to play as White if you understand the key ideas.
Dragon: 6.Be3 Bg7 7.Be2 0-0 8.Qd2 followed by 0-0-0. This is a main line Dragon (7.f3 0-0 8.Qd2 Nc6 9.0-0-0) without the theory, and it even offers White some chances of an edge.
Classical: The 6.Bg5 lines are extremely hard to master with either colour, so I recommend 6.Be3, meeting 6...e5 with 7.Nf3 and 6...Ng4 with 7.Bb5. The former line is just equal but doesn't require any maintenance. The latter line is equal, but only if Black really knows his theory.
Taimanov: 6.Be3 followed by 7.f4 almost no matter what Black plays. Almost no theory, and certainly a dangerous weapon with a bit of preparation.
Four Knights: 6.Ndb5 Bb4 7.a3 Bc3 8.Nc3 d5 9.ed5 ed5 10.Bd3. Easy to play for Black, but also for White.
Paulsen/Kan: 5.c4 Nf6 6.Nc3. This seems to offer as good a chance of an edge as 5.Nc3 or 5.Bd3. And Black doesn't have anywhere near as many options as after 5.Bd3.
Pin Variation: 6.e5 followed by 7.Qg4. If you study this properly for a few hours you will never have to look at the line again.
Accelerated Dragon: Maroczy Bind with Nc2. White has good chances of emerging with a slight edge and his plans are pretty clear-cut. If Black tries to avoid Nc2 with 5...Nf6 6.Nc3 Nd4 7.Qd4 d6 then 8.Bg5 Bg7 9.Qd2 0-0 10.Bd3 is slightly better for White.
Sveshnikov: 9.Nd5 Be7 10.Bf6 Bf6 11.c4. Easy to learn and play, while still giving White some chances for an advantage.
Grivas Sicilian: I like 7.a3 more than any other line for White.
Kalashnikov: Play 6.N1c3 a6 7.Na3 b5 8.Nd5 and 9.c4, but without taking on b5. Meet ...Nxd5 with cxd5.
Lowenthal: 8.Qc7 is a crafty move that deprives Black of much of his typical counterplay.
A combination of main lines and sidelines here, but one thing all these lines have in common is that they are quite easy to play as White and are somewhat thematically linked (e.g. Be3/f4 in the Najdorf, Scheveningen and Taimanov, c4 against the Kan, Accelerated Dragon, Sveshnikov).
Ultimately, I would recommend the Open Sicilians over Anti-Sicilians for most people, but you can also learn a lot from studying the Bb5 or Alapin Sicilians.
And this post is a perfect example why I don't play the Open Sicilian. Even with MNb's insistence that learning sidelines for each variation is easier than mainlines, you've still got 13 named variations listed in this post. I couldn't tell you what is the Lowenthal or Kalashnikov variation, let alone what my choice of lines against them are. I'm thinking just learning the names of all the Open Sicilian variations would take me almost as long as learning to play one of the "easier" anti-Sicilians.
At lower levels, it doesn't matter as much. But as a 1700 routinely facing 1900+ competition, many of my opponents have been playing the same pet line of the Open Sicilian for years, so they know what they're doing. Against the lower rateds, I can probably make it up as I go, but I actually came very close to disaster that way about a month ago when I tried out the Open against a 1300 just to see what would happen.