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Why is the continuation 6. ... e6 and not 6. ... e5? Is it not a good idea to drive the knight on d4 away? Thanks in advance!
You need to read up on transpositions, dude.
Isn't the main line e5?
Oh wait Bg5 was played.
The idea behind not playing 6. ... e5 is that the d5 square becomes especially weak with the f6 Knight pinned, and White still being able to play Bc4.
Ok I see.
you can leave the pawn on e7, and play Nbd7, and possibly play e5 in one go later, but its not necessarily bad to slow-step it. e6 makes playing d5 sooner easier sometimes.
In Opocensky (6.Be2), 6...e5 is very common, but there...not.
6...Nbd7 intending in some lines ...e5 in one go is an interesting and quite topical line. The direct 6...e5 is not good.
I'm not trying to be rude or snide here:
Just start playing 6...e5 in this position whenever you can, and sooner or later your opponents will answer the question for you. OR you can just take it for granted that everyone else knows something you don't and stick with the most popular moves in the Game Explorer here OR you can blindly play the percentages, who knows, maybe 6...e5 will work for you
...e5 has been played, but the backward pawn on d6 is weak.
If ...e6 then, it will be meant by f4 (intending e5) pinning the knight.
Right choice is to look on chess.com explorer
The point is that 6 Bg5 is specifically directed against the standard Najdorf move ...e5. With either 7 Nf5 or Bxf6 first, White will secure an enduring positional advantage.
It isn't so much that White's domination of d5 is so strong for him, but more that Black's normal counterplay is effectively stifled. The Nadjorf was not designed to be passive defense, and Black will not enjoy his play in these lines.
So aside from the sidelines IM pfren mentions above with 6...Nbd7 (which has never completely gone out of style), 6 ...e6 is necessary - but adequate to the task of keeping some counterchances for Black.