1. e2e4  1... c7c5  2. g1f3  2... d7d6  3. d2d4  3... c5d4  4. f3d4  4... g8f6  5. b1c3  5... a7a6  6. c1g5 Once 6.Bg5 had the undisputed status of being the main line against the Najdorf Variation. This predilection is now shared with the English Attack, starting with 6.Be3. But the old move remains one of the most dangerous weapons at White's disposal. If you're going to play the Najdorf as Black, it's good to start your studies here: in these lines, one careless move is fatal. 6... e7e6  7. f2f4  7... h7h6  8. g5h4  8... b8d7  9. d1f3  9... e6e5 [%c_effect e5;square;e5;type;GreatFind;persistent;true] In the early days of the Najdorf, such a move would have been unthinkable—moving a pawn again instead of developing the bishop on f8,  inviting the white knight to jump to the dangerous square on f5. But computers have shown that in chess, almost anything is possible. 10. f4e5 [%c_effect e5;square;e5;type;Inaccuracy;persistent;true] 10... d7e5  11. f3e2  11... f8e7  12. e1c1  12... c8g4 [%c_effect g4;square;g4;type;GreatFind;persistent;true] Taking the opportunity to gain time in development. It's already clear that something went wrong for White in the opening. 13. d4f3  13... a8c8  14. h2h3  14... g4f3 