1. e2e4  1... c7c5  2. g1f3  2... d7d6  3. d2d4  3... c5d4  4. f3d4  4... g8f6  5. b1c3  5... a7a6  6. h2h3  6... e7e5  7. d4b3 When people started trying 6.h3 against the Najdorf, the idea was to take the knight to e2 and then try to play g4-Ng3. Currently two other withdrawals are also popular, either 7.Nb3 or 7.Nf3. 7... c8e6 