Sicilian Defense: Nyezhmetdinov-Rossolimo Attack, Gurgenidze Variation

The Sicilian Defense: Nyezhmetdinov-Rossolimo Attack, Gurgenidze Variation is a chess opening classified under ECO code B31 in the Semi-Open Games family, where Black responds to 1.e4 with something other than 1...e5, including the Sicilian Defense, Caro-Kann, and Pirc. It is reached after 6 moves: 1. e4 c5 2. Nf3 Nc6 3. Bb5 g6 4. O-O Bg7 5. Re1 e5 6. b4. The resulting position leaves black to move.