B23: Sicilian, closed, Korchnoi variation

B23 Sub-variants:

• Sicilian, closed
  1. e4 c5 2. Nc3
• Sicilian, closed, Korchnoi variation
  1. e4 c5 2. Nc3 e6 3. g3 d5
• Sicilian, closed, 2...Nc6
  1. e4 c5 2. Nc3 Nc6
• Sicilian, chameleon variation
  1. e4 c5 2. Nc3 Nc6 3. Nge2
• Sicilian, Grand Prix attack
  1. e4 c5 2. Nc3 Nc6 3. f4
• Sicilian, Grand Prix attack, Schofman variation
  1. e4 c5 2. Nc3 Nc6 3. f4 g6 4. Nf3 Bg7 5. Bc4 e6 6. f5