Originally posted by robbie carrobie
mmm, how can this be Leggy for 2...Nc6 does not allow the bind because of ...Qb6 in
my mind, whereas 2....d6 does. Am i picking this up correctly, for i have been
experimenting with my pieces and board and find that white gets into all sorts of
difficulties when he tries to play the bind after 2...Nc6. Any help in this regard would be
most astle kingside. im not saying its impossible, just a little unanutural} *[/pgn]
The difference is that Black switched from 2. ... Nc6 to 2. ... d6 so that after 1. e4 c5 2. Nf3 d6 3. d4 cd 4. Nxd4 Nf6, 5. c4 can't be played.
This move order attacks white's e4 pawn, while cutting out tactics based on Nxc6 and e4-e5.
White's best way to defend the e4 pawn is to play 5. Nc3, as Nimzo5's observation about an early f3 is right on the money.
With the old move order 1. e4 c5 2. Nf3 Nc6 3. d4 cd 4. Nxd4, an immediate ...Nf6 was not considered attractive due to the Nxc6 and e4-e5 idea. In the early days black would play 4. d6 followed by Nf6 and then either e6 or g6 to taste.
Either way, after 4. d6 white can play 5. c4, because the e4 pawn is not under attack.
There was a point in time where the Maroczy Bind was considered a virtual refutation of the Dragon (such that the Dragon almost disappeared from tournament praxis), so the 2. ... d6 move order was considered an important innovation.
Some of my older books refer to the 2. ... Nc6 variation as the "Classical Dragon", and the 2. ... d6 move order as the "Modern Dragon", but that distinction has faded away since the 1980's.
Nowadays we mostly see the Classical move order Dragon via 1. e4 c5 2. Nf3 Nc6 3. d4 cd 4. Nxd4 d6 5. Nc3 Nf6, where Black will play 6. ... g6 after 6. Be2, while still reserving the option to play 6. ... e6 after 6. Bc4.
Of course, chess theory has evolved considerably in the last 60 years or so, and now the Accelerated Dragon is considered to be entirely acceptable. I think that has much to do with all the advances that have been made in the Symmetrical English, and the Hedgehog in particular, but that is a story for another day.