text: Botvinnik System: 6.e4 A27 English Opening, Three Knights System: 1...e5 2.Nc3 Nc6 3.Nf3 (without: 3...Nf6)
  A28 English Opening, Four Knights System: 1...e5 2.Nc3 Nc6 3.Nf3 Nf6 (without 4.g3)
  A29 English Opening, Four Knights, Kingside Fianchetto: 1...e5 2.Nc3 Nc6 3.Nf3 Nf6 4.g3
  A30 English Opening, Symmetrical Defence: 1.c4 c5 (without: 2.Nc3, 2.e4, 2.g3 g6 3.Nc3, 2.g3 Nc6 3.Nc3, 2.Nf3 Nc6 3.Nc3, 2.e3 Nf6 4.d4)
  A31 English Opening, Symmetrical, Benoni formation: 1...c5 2.Nf3 Nf6 3.d4 (without: 3...cxd4 4.Nxd4 e6, 3...cxd4 4.Nxd4 a6 5.Nc3 e6, 3...cxd4 4.Nxd4 Nc6 5.Nc3 e6)
  A32 English Opening, Symmetrical: 1...c5 2.Nf3 Nf6 3.d4 cxd4 4.Nxd4 e6 (without: 5.Nc3 Nc6)
  A33 English Opening, Symmetrical: 1...c5 2.Nf3 Nf6 3.d4 cxd4 4.Nxd4 e6 5.Nc3 Nc6
  Geller Variation: 6.g3 Qb6
  A34 English Opening, Symmetrical: 1...c5 2.Nc3 (without 2...Nc6, 2...Nf6 3.Nf3 Nc6, 2...Nf6 3.e4 e6, 2...e6 3.Nf3 Nf6, 4.g3 Nc6)
  A35 English Opening, Symmetrical: 1...c5 2.Nc3 Nc6 (without 3.g3, 3.e4, 3.Nf3 Nf6, 4.g3 e6, 3.Nf3 Nf6 4.d4 cxd4 5.Nxd4, 3.Nf3 e5 4.g3 g6 5.Bg2 Bg7)
  Four Knights: 3.e3 Nf6 4.Nf3
  A36 English Opening, Symmetrical: 1...c5 2.Nc3 Nc6 3.g3 (without: 3...g6 4.Bg2 Bg7 5.Nf3 (A37–A39), 3...g6 4.Bg2 Bg7 5.Rb1 Nf6 6.d3 0-0 7.Nf3 d6 8.0-0 (A38))
  A37 English Opening, Symmetrical: 1...c5 2.Nc3 Nc6 3.g3 g6 4.Bg2 Bg7 5.Nf3 (without: 5...Nf6 (A38–A39))