ECO C30
ECO C00–C99 — Open Games and the French Defense: 1.e4 e6 and 1.e4 e5, from the Italian and Ruy Lopez to the King's Gambit.
30 named opening lines are classified under ECO code C30.
- King's Gambit — 1.e4 e5 2.f4
- King's Gambit Declined: Classical Variation — 1.e4 e5 2.f4 Bc5
- King's Gambit Declined: Classical Variation, Euwe Attack — 1.e4 e5 2.f4 Bc5 3.Nf3 d6 4.c3 Bg4 5.fxe5 dxe5 6.Qa4+
- King's Gambit Declined: Classical Variation, Rotlewi Countergambit — 1.e4 e5 2.f4 Bc5 3.Nf3 d6 4.b4
- King's Gambit Declined: Classical Variation, Rubinstein Countergambit — 1.e4 e5 2.f4 Bc5 3.Nf3 d6 4.c3 f5
- King's Gambit Declined: Classical Variation, Walthoffen Attack — 1.e4 e5 2.f4 Bc5 3.Qh5
- King's Gambit Declined: Classical, Hanham Variation — 1.e4 e5 2.f4 Bc5 3.Nf3 d6 4.Nc3 Nd7
- King's Gambit Declined: Classical, Réti Variation — 1.e4 e5 2.f4 Bc5 3.Nf3 d6 4.c3 f5 5.fxe5 dxe5 6.d4 exd4 7.Bc4
- King's Gambit Declined: Classical, Soldatenkov Variation — 1.e4 e5 2.f4 Bc5 3.Nf3 d6 4.fxe5
- King's Gambit Declined: Classical, Svenonius Variation — 1.e4 e5 2.Bc4 Nc6 3.Nc3 Nf6 4.d3 Bc5 5.f4 d6 6.Nf3 Bg4 7.h3 Bxf3 8.Qxf3 exf4
- King's Gambit Declined: Hobbs-Zilbermints Gambit — 1.e4 e5 2.f4 Nc6 3.Nf3 g5 4.fxg5 h6
- King's Gambit Declined: Keene Defense — 1.e4 e5 2.f4 Qh4+ 3.g3 Qe7
- King's Gambit Declined: Keene's Defense — 1.e4 e5 2.f4 Qh4+
- King's Gambit Declined: Mafia Defense — 1.e4 c5 2.f4 e5
- King's Gambit Declined: Miles Defense — 1.e4 e5 2.f4 Nc6 3.Nf3 f5
- King's Gambit Declined: Norwalde Variation — 1.e4 e5 2.f4 Qf6
- King's Gambit Declined: Norwalde Variation, Bücker Gambit — 1.e4 e5 2.f4 Qf6 3.Nc3 Qxf4 4.Nf3 Bb4 5.Bc4
- King's Gambit Declined: Norwalde Variation, Schubert Variation — 1.e4 e5 2.f4 Qf6 3.Nc3 Qxf4 4.d4
- King's Gambit Declined: Panteldakis Countergambit — 1.e4 e5 2.f4 f5
- King's Gambit Declined: Panteldakis Countergambit, Greco Variation — 1.e4 e5 2.f4 f5 3.exf5 Qh4+
- King's Gambit Declined: Panteldakis Countergambit, Pawn Sacrifice Line — 1.e4 e5 2.f4 f5 3.exf5 exf4 4.Qh5+ g6 5.fxg6 Qe7+ 6.Kd1
- King's Gambit Declined: Panteldakis Countergambit, Schiller's Defense — 1.e4 e5 2.f4 f5 3.exf5 Bc5
- King's Gambit Declined: Panteldakis Countergambit, Shirazi Line — 1.e4 e5 2.f4 f5 3.exf5 exf4 4.Qh5+ Ke7
- King's Gambit Declined: Panteldakis Countergambit, Symmetrical Variation — 1.e4 e5 2.f4 f5 3.exf5 exf4 4.Nf3 d5 5.d4 Bd6 6.Bd3
- King's Gambit Declined: Petrov's Defense — 1.e4 e5 2.f4 Nf6
- King's Gambit Declined: Queen's Knight Defense — 1.e4 e5 2.f4 Nc6
- King's Gambit Declined: Senechaud Countergambit — 1.e4 e5 2.f4 Bc5 3.Nf3 g5
- King's Gambit Declined: Soller-Zilbermints Gambit — 1.e4 e5 2.f4 f6 3.fxe5 Nc6
- King's Gambit Declined: Zilbermints Double Countergambit — 1.e4 e5 2.f4 g5
- King's Gambit Declined: Zilbermints Double Gambit — 1.e4 e5 2.f4 Nc6 3.Nf3 g5