ECO A42: Modern Defense & Pterodactyl Defense
ECO A42 is part of volume A, Flank Openings.
The Lichess chess-openings dataset files 6 named lines under it, from 2 different openings.
The shortest is Modern Defense: Averbakh System:
1. d4 g6 2. c4 Bg7 3. Nc3 d6 4. e4.
That position has come up in 4,118,333 Lichess games between players rated 1600 to 2500: White won 48.9%, 4.9% were drawn and Black won 46.1%.
| Opening | Moves | Games | Length |
|---|---|---|---|
| Modern Defense: Averbakh System | 1. d4 g6 2. c4 Bg7 3. Nc3 d6 4. e4 |
4.1M | 4 moves |
| Modern Defense: Kotov Variation | 1. d4 g6 2. c4 Bg7 3. Nc3 d6 4. e4 Nc6 |
821K | 4 moves |
| Modern Defense: Randspringer Variation | 1. d4 g6 2. c4 Bg7 3. Nc3 d6 4. e4 f5 |
68K | 4 moves |
| Modern Defense: Averbakh Variation, Pseudo-Sämisch | 1. d4 g6 2. c4 Bg7 3. e4 d6 4. Be3 Nf6 5. f3 |
85K | 5 moves |
| Pterodactyl Defense | 1. Nf3 c5 2. c4 g6 3. d4 Bg7 4. e4 Qa5+ 5. Nc3 d6 |
2,287 | 5 moves |
| Pterodactyl Defense: Central, Bogolubovia | 1. d4 g6 2. c4 Bg7 3. e4 d6 4. Nc3 c5 5. Nge2 Qa5 |
164 | 5 moves |