text: A90 Dutch Defence 2.c4 Nf6 3.g3 e6 4.Bg2 (without 4...Be7 (A91–A99))
  A91 Dutch Defence 2.c4 Nf6 3.g3 e6 4.Bg2 Be7 (without 5.Nf3 (A92–A99))
  A92 Dutch Defence 2.c4 Nf6 3.g3 e6 4.Bg2 Be7 5.Nf3 0-0 (without 6.0-0 (A93–A99))
  A93 Dutch, Stonewall, Botvinnik Variation 2.c4 Nf6 3.g3 e6 4.Bg2 Be7 5.Nf3 0-0 6.0-0 d5 7. b3 (without 7...c6 8.Ba3 (A94))
  A94 Dutch, Stonewall with 6.0-0 d5.7.b3 c6 8.Ba3
  A95 Dutch, Stonewall with 6.0-0 d5.7.Nc3 c6
  A96 Dutch, Classical Variation 2.c4 Nf6 3.g3 e6 4.Bg2 Be7 5.Nf3 0-0 6.0-0 d6 (without 7.Nc3 Qe8 (A97–A99))
  A97 Dutch, Ilyin–Genevsky Variation 7.Nc3 Qe8 (without 8.Qc2 (A98) and 8.b3 (A99))
  A98 Dutch, Ilyin–Genevsky Variation with 7.Nc3 Qe8 8.Qc2
  A99 Dutch, Ilyin–Genevsky Variation with 7.Nc3 Qe8 8.b3
  B – Semi-Open Games other than the French Defence
  1.e4 without 1...c5, 1...e6 or 1...e5 (B00–B19)
  1.e4 c5: Sicilian Defence (B20–B99)
  B00–B19
  1.e4 without 1...c5, 1...e6 or 1...e5
  B00 King's Pawn Opening without 1...e5, 1...e6, 1...d5, 1...Nf6, 1...g6, 1...d6, 1...c6, 1...c5.
  Nimzowitsch Defence 1...Nc6 (without 2.Nf3 e5 (C44, C50, C60))
  St. George Defence 1...a6 (without 2.d4 e6 (C00))
  Corn Stalk Defence 1 ...a5
  Owen's Defence (Greek Defence) 1...b6 (without 2.d4 e6 3.c4 (A40))
  Matinovsky Gambit 1...b6 2.d4 Bb7 3...f5
  Hippopotamus Defence