Chess Opening Theory/1. e4/1...c5/2. Nf3/2...d6/3. d4/3...cxd4/4. Nxd4/4...Nf6/5. Nc3/5...a6/6. Bg5/6...e6/7. f4/7...Qb6

= Sicilian Defence, Poisoned Pawn Variation = Moves: 1. e4 c5 2. Nf3 d6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 a6 6.Bg5 e6 7.f4 Qb6

Black launches a direct attack on the b2 pawn. White should defend it with /8. Nb3/ or leave it to the enemy with /8. Qd2/. This variation gained notoriety in the 1960s with Fischer's espousal of the system. His idea was that after grabbing a pawn, he could use his almost flawless technique to neutralize White's dangerous lead in development, and then win with his extra pawn and bishop pair.

Theory table
.

1.e4 c5 2.Nf3 d6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3 a6 6.Bg5 e6 7.f4 Qb6