First of all I don't own OFWAA 11 yet so I can't tell you where they diverge but since Khalifman didn't have access to "The New Sicilian Dragon" I'm hopeful that he didn't refute the entire opening. Williams does think the setup with Bc4 in the Yugoslav is the most critical from White and thinks a plan with an early ...h6 (at least versus the typical White development with Qd2,Be3,f3) may be the most promising for Black. He also mentions what seems to be a playable system where Black castles queenside. This may have been posted elsewhere on the forum but in case not here are the contents:
Bibliography 4
Introduction 5
1 The Main Line: An early Bc4 15
2 The Main Line: Queenside Castling with g4 and h4 44
3 The Main Line: Queenside Castling and a quick Bh6 70
4 The Main Line: Positional Tries and Early Deviations 95
5 The Accelerated Dragadorf 114
6 Classical Lines for White 157
7 Less Common Lines for White 191
Index of Variations 220
Index of Games 223
I'd like to mention that one of my very small contributions to the chess world (they've all been very small!) is the name "Accelerated Dragadorf" If you don't like that name then you can blame me. That originated from my thread on the forum here
http://www.chesspub.com/cgi-bin/yabb2/YaBB.pl?num=1166156625/3. Not long afterwords Ward wrote this in his January 2007 update in the notes to Demianjuk-Kabanov 2006, "When I browsed the forums the other day I noticed that a thread had started up regarding what it seems we might call the 'Accelerated Dragadorf' and relates to the sequence 6... a6 7. f3 b5 Actually I had given a little thought to this idea which favours leaving the bishop on f8 in favour of this swift queenside expansion." I had proposed this idea for Black to save a tempo on the Bh6, ...Bxh6 lines for Black but Ward mentioned the equally important idea that Black's bishop covers the b4 square from home which helps out in a4, ...b4 sequences. I haven't found the latter point mentioned by Williams in his book but he does seem to cover those variations well. Perhaps he didn't mention it because White's most critical response to ...b4 is Nd5! which appears to stop any scenario where the bishop can attack b4.
I thought the introductory chapter was well written and brought up some very good points on how to play the positions for Black. I certainly learned from it. All of the games in the theoretical chapters are well annotated and there is a wealth of new analysis put forward in the notes. I mentioned earlier that Williams gives the early Bc4 of chapter one as the most critical variation, chapters 2 and 3 seem quite comfortable for Black (In case it's not obvious those chapters deal with setups where White's bishop doesn't make it to c4.) White's best way to cause trouble in this line might be to try an early g4,h4 combo before castling queenside. Chapter 4 deals with some positional ideas for White. Williams mentions these ideas are annoying for the player of the Black pieces but Black seems to be OK although this probably represents the second most critical try from White. Black needs to know what he's doing against the other variations but the book shows effective ways for Black to meet White's other tries. The last two chapters could be useful to those who play the regular Dragon. I personally think this is an excellent book and a model for how to write about a new opening.
Quote:"...it's an inspiring book for those who like the less trodden path - though in 5-10 years it will probably be either refuted or very theoretical, so have fun while it lasts!", TalJechin.
I'm inclined to believe the opening will remain playable but since much of William's analysis is new some of it is likely to be refuted. That's only to be expected in a new opening system where a lot more tests are still needed to clarify many variations. I do fear that it will become very theoretical and this will probably happen closer to 5 years than 10 years. An aggressive new defence for Black against 1.e4 is bound to get fairly popular at some point.