ENCYCLOPEDIA OF CHESS OPENINGS
ECO Code is a trademark of Chess Informant

ECO
A

ECO
B

ECO
C

ECO
D

ECO
E


without 1.d4, 1.e4
1. e4 without
1... c5, 1... e6,
1... e5

1. e4 e6

1. d4 d5

1. d4 Nf6 2. c4 e6

1. d4 without
1... Nf6, 1... d5

1. e4 c5

1. e4 e5

1. d4 Nf6 2. c4 g6 with 3... d5

1. d4 Nf6 2. c4 g6 without 3... d5

1. d4 Nf6
without 2. c4
1. d4 Nf6 2. c4 without 2... e6,
2... g6