Markovich wrote on 05/28/09 at 13:01:28:
Paddy, what in your opinion is White's route to advantage after 3.Nc3 Nf3 4.Bg5 Be7 5.e5 Nfd7? I had been under the impression that 6.Bxe7 Qxe7 was holding up pretty well for Black, with the early ...a6. Further I have the opinion that 6.h4 is not really a very serious test for Black.
I think that it is actually quite hard to say exactly what the theoretical standing of the Classical with 1 e4 e6 2 d4 d5 3 Nc3 Nf6 4 Bg5 Be7 5 e5 Nfd7 is, because in recent years it has lacked regular support from among the top professionals. Instead, 4...dxe4 and 4...Bb4 are the pros’ choice.
There are two ways of looking at this:
a) Glass half empty: the relative neglect of 4...Be7 by the pros means that they do not trust it, lending weight to the traditional assessment that this line just has to be better for White, since he has already acquired several advantages: he has more space and he has exchanged his bad bishop for Black’s good one, leaving Black with two bad pieces (the c8 bishop and the d7 knight) and a persistent weakness on the dark squares.
b) Glass half full: there is still unexplored territory and room for creativity, and the fact that some very strong players (e.g. Kortchnoi, Morozevich, Bareev) are prepared to wheel it out from time to time indicates that, although not a guaranteed equalizer, the line is playable and probably not as bad as its reputation. It must contain many variations and ideas that have not been sufficiently “road tested” yet, and thus the evaluations (e.g. in ECO) should not be treated as gospel. Black can also be encouraged by these factors: his centre is solid and indeed practically unassailable in the near future; he can quickly build pressure on White’s pawn centre by ...c5 (once he has defused the threat of Nb5 in reply) and ...f6; finally the exchange of bishops has eased his cramped position a little and developed his queen to a useful square, eyeing both wings.
When students have reached a stage where they are ready and willing to try a half-open defence, this is one that I suggest, generally with decent results. I admit to having had a soft spot for 4...Be7 for some time, ever since I read the games of the strong Canadian GM Abe Yanofsky in his book “Chess – the Hard Way”.
Some specifics; IMHO, 6 h4 remains dangerous and unclear. Black has several playable options, but needs to know what he is doing. I consider 6...c5 to be fairly reliable, and the experimental Guimard-like 6...Nc6 (developing a piece and “threatening” ...f6 next) seems a promising area for research. I don’t fully trust 6...0-0 or 6...Bxg5 and consider everything else to give White a clear advantage.
After 6 Bxe7 Qxe7, most of the time one faces 7 f4 (but we can expect to see more of Watson's 7 Qh5), when both 7...0-0 and 7...a6 are playable. I encourage students to learn to play 7...0-0 first, since it is more straightforward. 7...a6 is admittedly more flexible (not yet revealing the monarch’s future location) , but making good use of that flexibility requires some judgement, based on experience, which first needs to be acquired.
For instance, after 7...0-0, any threat of Bd3xh7 can usually be met appropriately by ...f6 or ...f5, whereas in the 7...a6 line, once White has played Bd3 it can be very hard for Black to judge whether ...0-0 is safe or not, for instance see Pruess-Kraai, Berkeley 2008. Incidentally, at chesslecture.com. Kraai suggests that a logical way for White keep an edge against 7...a6 (which he prefers to 7...0-0) is 8 Nf3 c5 9 Qd2 Nc6 10 dxc5 Qxc5 11 0-0-0 b5 and now 12 Ne2, but again there is insufficient data. Besides, at almost every turn there are offshoots that have been played by very strong players: 8...Nb6 (Morozevich); 10...Nxc5 (Seirawan, Akobian); 11...Nb6 (Kortchnoi, Short).
Some other ideas that might be fruitful:
7. f4 O-O 8.Nf3 c5 9. Qd2 Nc6 10. dxc5 Qxc5 11. Bd3 f6 12. exf6 Nxf6!? 13. O-O-O Rb8 intending ...b5. - WGM Danelian has scored well with this recently. The bad d7 knight finds a good square, the black king is safer and there is counterplay on the queenside as well as (possibly) against e3 and f2.
7. f4 O-O 8.Nf3 c5 9. Bd3 f5 10. exf6 Rxf6!? – Yanofsky almost beat Bronstein with this at Saltsjobaden 1948 (eventually drawn) but it has been generally dismissed as inferior since he lost with it against Gligoric at Dallas 1957; however, I think Black’s play can be improved.
7. f4 a6 8 Nf3 b6!? followed by ..c5; a Cuban idea, ensuring very different play from normal, since White’s usual dxc5 plan will be ineffective.
Put all this uncertainty together and finally mix in the very different structures of the MacCutcheon and the Burn and it becomes easier to understand that the widespread preference for 4 e5 is above all a practical one. Although the variation tree after 4 e5 is now enormous, at least with 4 e5 White is guaranteeing himself the same structure every game, and he can comfort himself with the thought that Black’s cramp will be worse without the exchange of bishops. However, since this is a typical French structure, and as a bonus he gets to keep his better bishop, Black can be satisfied too.
Sorry for the delay in replying - and then it turned into an essay!