Pterodactyl Defense: Eastern, Anhanguera
1. e4 g6 2. d4 Bg7 3. Nc3 c5 4. Be3
The Pterodactyl Defense: Eastern, Anhanguera is a chess opening classified as ECO B06, reached after 1. e4 g6 2. d4 Bg7 3. Nc3 c5 4. Be3. It is a line of the Pterodactyl Defense. Black is to move.
In 12.6 million rated Lichess games (blitz and slower), this position was reached 312 times by this move order. White won 49%, 4% were drawn and Black won 47%. The most popular continuation is 4… cxd4 (64% of games).
Engine evaluation: +0.57 (Stockfish, depth 40; best line 4… Bxd4 5. Bxd4 cxd4 6. Qxd4 Nf6 7. O-O-O)
- ECO
- B06
- Moves
- 7 plies
- FEN
rnbqk1nr/pp1pppbp/6p1/2p5/3PP3/2N1B3/PPP2PPP/R2QKBNR b KQkq - 1 4- PGN
1. e4 g6 2. d4 Bg7 3. Nc3 c5 4. Be3
Analyse with Stockfish · Board image (SVG) · Open on Lichess
Results by rating
| Average rating | Games | White / draw / Black |
|---|---|---|
| 0-1499 | 6 | |
| 1500-1999 | 121 | |
| 2000+ | 185 | |
| All | 312 |
Most played moves
| Move | Games | White / draw / Black |
|---|---|---|
| 4… cxd4 | 201 (64%) | |
| 4… Qb6 | 36 (12%) | |
| 4… Qa5 | 30 (10%) | |
| 4… Nc6 | 29 (9%) | |
| 4… Nf6 | 8 (3%) | |
| 4… d6 | 3 (1%) | |
| 4… b6 | 2 (1%) | |
| 4… e6 | 2 (1%) |
Master games
224 over-the-board games are classified under this line (White 44%, draw 14%, Black 42%). The strongest:
- SlowChess Blitz 2.83 avx2 (3490) – rofChade 2.321 (3467) 1/2-1/2 · TCEC 22 Premier 2022 · 2022-03-13
- rofChade 2.321 (3467) – SlowChess Blitz 2.83 avx2 (3490) 1-0 · TCEC 22 Premier 2022 · 2022-03-10
- Ethereal TCEC S20 DivP (3482) – rofChade 2.309 (3423) 1-0 · TCEC 20 Premier 2020 · 2020-12-31
- rofChade 2.309 (3423) – Ethereal TCEC S20 DivP (3482) 1/2-1/2 · TCEC 20 Premier 2020 · 2020-12-29
- GM Magnus Carlsen (2863) – GM Naroditsky, D. (2621) 1-0 · Katara Bullet Final 2020 · 2020-08-26
Search all games of the Pterodactyl Defense: Eastern, Anhanguera and its sub-variations
Highest-rated Lichess games
- Zashibeatles_Chess (2648) – Pblu35 (2642) 1/2-1/2 · 2026-09-07 · 180 + 0s
- IM KingofCheapos (2516) – Dondoooo1 (2584) 0-1 · 2026-09-05 · 180 + 0s
- FM QueenDrop (2408) – bojarin1982 (2590) 0-1 · 2026-09-05 · 180 + 2s
Comes from
Modern Defense: Modern Pterodactyl 1. e4 g6 2. d4 Bg7 3. Nc3 c5
More Pterodactyl Defense lines (all)
- Pterodactyl Defense: Central, Benoni Beefeater Pterodactyl A40
- Pterodactyl Defense: Central, Benoni Pterodactyl A40
- Pterodactyl Defense: Fianchetto, Queen Benoni Pterodactyl A40
- Pterodactyl Defense: Fianchetto, Queen Pteranodon A40
- Pterodactyl Defense: Fianchetto, Queen Pterodactyl A40
- Pterodactyl Defense: Queen Pterodactyl, Quiet Line A40
- Pterodactyl Defense A42
- Pterodactyl Defense: Central, Bogolubovia A42
- Pterodactyl Defense: Austrian, Austriadactylus Western B06
- Pterodactyl Defense: Austrian, Grand Prix Pterodactyl B06
- Pterodactyl Defense: Austrian, Pteranodon B06
- Pterodactyl Defense: Central, Anhanguera B06
Opening names and moves from the Lichess openings dataset; statistics from the Lichess open database, 2026-09 (CC0), sample of 12.6 million games, bots excluded; evaluations from Lichess cloud analysis (all CC0). Master games from The Week in Chess #920–#1664 by Mark Crowther, used with permission.