ECO C21

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.

16 named opening lines are classified under ECO code C21.

• Center Game Accepted — 1.e4 e5 2.d4 exd4
• Center Game: Halasz-McDonnell Gambit — 1.e4 e5 2.d4 exd4 3.f4
• Center Game: Halasz-McDonnell Gambit, Crocodile Variation — 1.e4 e5 2.d4 exd4 3.f4 Bc5 4.Nf3 Nc6 5.c3
• Center Game: Kieseritzky Variation — 1.e4 e5 2.d4 exd4 3.Nf3
• Center Game: Lanc-Arnold Gambit — 1.e4 e5 2.d4 exd4 3.Nf3 Bc5 4.c3
• Center Game: Lanc-Arnold Gambit, Schippler Gambit — 1.e4 e5 2.d4 exd4 3.Nf3 Bc5 4.c3 dxc3 5.Bc4
• Center Game: Ross Gambit — 1.e4 e5 2.d4 exd4 3.Bd3
• Center Game: von der Lasa Gambit — 1.e4 e5 2.d4 exd4 3.Bc4
• Danish Gambit — 1.e4 e5 2.d4 exd4 3.c3
• Danish Gambit Accepted — 1.e4 e5 2.d4 exd4 3.c3 dxc3
• Danish Gambit Accepted: Chigorin Defense — 1.e4 e5 2.d4 exd4 3.c3 dxc3 4.Bc4 cxb2 5.Bxb2 Qe7
• Danish Gambit Accepted: Classical Defense — 1.e4 e5 2.d4 exd4 3.c3 dxc3 4.Bc4 cxb2 5.Bxb2 Nf6
• Danish Gambit Accepted: Copenhagen Defense — 1.e4 e5 2.d4 exd4 3.c3 dxc3 4.Bc4 cxb2 5.Bxb2 Bb4+
• Danish Gambit Accepted: Schlechter Defense — 1.e4 e5 2.d4 exd4 3.c3 dxc3 4.Bc4 cxb2 5.Bxb2 d5
• Danish Gambit Accepted: Svenonius Defense — 1.e4 e5 2.d4 exd4 3.c3 Ne7
• Danish Gambit Declined: Sörensen Defense — 1.e4 e5 2.d4 exd4 3.c3 d5