Originally posted by peacedog
its the 6 ... e5 thing that always puzzles me:-(
This move appears in the Lowenthal, Sveshnikov, Kalashnikov, Lasker, Pelikan, and Boleslavsky systems, in addition to the Najdorf.
In Winning with the Sicilian
(1991) by GM Mark Taimanov, he offers an excellent general explanation in his coverage of the Boleslavsky:
After 1. e4 c5 2. Nf3 Nc6 3. d4 cd 4. Nxd4 Nf6 5. Nc3 d6 6. Be2 e5!? he writes
"This energetic blow in the centre characterizes the plan of dynamic play developed by I. Boleslavsky. It's motives are polemical, in as far as they contradict the classical laws of strategy. It is evident that a backward pawn has now been created in the black camp (yes, on an open file as well!) and the central d5 square becomes a convenient outpost for White's pieces (according to a remark attributed to Lasker, a 'hole' in the pawn 'wall'
. But against this Black gains time and space for the activation of his forces which, to the mind of the originator, to some extent compensate for the positional concessions. In short, play becomes of a dynamic and concrete nature, where each of the players have their trumps. Of course, Boleslavsky's plan is not new (La Bourdonnais had previously employed a similar motif on the 4th move and Lasker on the 5th), but it was he who shaped the controversial idea into a harmonious strategical system."
I think it is a pretty good explanation, although when he wrote "in short..." I had to laugh a bit!
Generally, Black hopes to trade pieces on d5 and force White to recapture there with a pawn, and then mobilize his kingside pawn majority a la
the King's Indian, but White has in turn a queenside majority he can exploit. Game on!