Markovich wrote on 03/29/10 at 12:38:39:
I think that a significant challenge to 5.f3 is 5...axb5 6.e4 Qa5+. After 7.Bd2 b4 8.Na3 d6 9.Nc4 Qd8, White seems to have a hard time proving any advantage. At one time 10.a3 was supposed to be good, but 10...e6 11.axb4 Rxa1 12.Qxa1 exd5 and Black gets more than enough play. So 10.Bd3 and it's a game of chess, but I'm not sure it's one that favors White very much. There's also 7.b4!?, a move whose merit is unclear to me.
After losing to an IM years ago after 5.f3 axb5 6.e4 e6!? (Black's 5th and 6th moves can obviously be reversed) I've always thought that line is under appreciated.
Unfortunately that Pedersen book has been pushed back for a while.
Out of curiosity I have a question for you Benko players: do you consider the Benko to be more solid than the King's Indian, Grunfeld, or Modern Benoni? Obviously Black is down a pawn, but the old fashioned lines look more solid to me, from Black's point of view, than other "West Indian" defenses. However the modern lines (5.f3, 4.Bg5, Zaitsev, etc) look just as messy as any King's Indian slugfest. Do modern Benko players fit more or less the same mold as King's Indian or Modern Benoni players, or are you guys still trying to get that favourable endgame?