|GilesFarnaby: <AdrianP: What's the current state of theory in the 6. f4 Najdorf - it doesn't seem to be played much at top level anymore.|
What's the recommended mainline: 6...e5 7. Nf3 Nbd7 ...?>
You´re right about it not being very popular, ´tho it has kind of resurrected this year at GM (not super-GM generally) level, with goods results for white, you maybe want to look up at World Cup games.
Statistically the best way to respond to an early Najdorf f4 is with the classicals e6 or e5.
If the f4 is played in lieu of the traditional f3 beggining the English Attack the main line has been simplifying with exf4, but an early open game in Najdorf generally satisfies White´s better diagonals, so I would rather advice you taking the initiative with Ng4, a very good line for Black in rapid games(amongst other things because of the surprise factor), in long games it has a poor record due to the fact that the weaknesses that it created in white´s position are utterly defensible with some care and strategic instinct; in blitz/rapid games playing the Ng4 line usually means going ahead in the clock, and we know how important is that!
click for larger view
See for example this game, where black doesn´t fully allow the board to be completely opened (otherwise white´s bishops will roll over black knights´ impotence:
[Event "EU-chT (Men)"]
[White "Brunner, Lucas"]
[Black "Kuczynski, Robert"]
1. e4 c5 2. Nf3 d6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 a6 6. Be3 e5 7. Nb3 Be6 8. f4
Ng4 9. Bd2 Qb6 10. Qf3 exf4 11. Qxf4 Nd7 12. Be2 Nge5 13. O-O-O Rc8 14. Be3 Qc7
15. Nd4 b5 16. Kb1 Nf6 17. a3 Be7 18. Nf5 Bxf5 19. exf5 O-O 20. Bd4 Rfe8 21. g4
Qc6 22. g5 Nd5 23. Nxd5 Qxd5 24. h4 Qc6 25. Bc3 a5 26. f6 Bf8 27. fxg7 Bxg7 28.
Rhf1 b4 29. axb4 axb4 30. Qxb4 Rb8 31. Qd4 Rec8 32. Rf3 Qb7 33. Rdf1 Rxc3 34.
Qxc3 Nxf3 0-1
I have spoken about the pawn-storming possibilities of f4 here:
<dicoAMS: i'm unable to go through the games please help.>
Maybe you want to take a look at my free video tutorial from the very beggining:
Anyway, any questions you have I´ll be attentive in case I can help/cooperate with something