Originally posted by exigentsky
Don't just go by a game result. If a game is won, it doesn't mean that the variation is winning or even good. Bb5+ Bd7 Bxd7 Qxd7 is NOT a winning line. A winning line would lead to a forced win and I don't see how one can claim that here. I wouldn't even be so sure White has an advantage. I don't think Black made any meaningful theoretical errors here. Ev guish. However, I doubt you would find Lasker or Capablanca ever play like this as Black.
I didn't say that it was a winning line, merely a good one. But you're right, the mere fact that all three database games after Bb5+ Bd7 are wins for White, doesn't necessarily indicate anything, since there are so few games. On the other hand, in addition to the results, limited (but suggestive) as they are, there is the fact that Black plays three times more games with the Nc6 line than the a5 line (I count 6 master level games), and the players using the former seem to include bigger names as well. But all this is admittedly tenuous.
As for whether it is consistent with classical principles, I stick with what I wrote earlier. I doubt that the figures you named would play this either. But I've seen much more radical openings (hypermodern) than this in special-collections databases, including the ultra-hypermodern scorpion -- also known as Pafu's opening, but played by Spassky I believe in a world championship game in the 1960s) -- in games dating from the 19th century.
The question is not how many pawn moves, but under what circumstances. I didn't say the center was locked, merely that it was closed (and it is with a hedgehog, given the game moves); if you wish to call this semi-closed, be my guest. The question is whether White intends to open it -- Black certainly does not early on. If White does not, because a kingside pawnstorm is more to his advantage, then it is as good as stable until the time when (if) Black decides he needs central counterplay because his queenside wing play is slower than White's kingside wing play. Meanwhile, if White does continue playing in the center, Black is free to develop his pieces instead of playing with pawns. He did not here because White didn't force him to. And I think that is perfectly consistent with classical principles as well: in a classical game, if your opponent plays to control the center, with few pawn moves and piece development to that end, you do too. If he moves a piece twice (without justification), or commits some other solecism under classical principles, then YOU are not only free to do the same in response, but indeed, obligated to, because deviating from standard play is the best way to punish non-standard play initiated by your opponent.
The real deviation from classical principles here is not so much by Black, I think, as by White, with his early kingside attack, leaving Black free to play on the queenside with the same end in mind.