ECO family guide

Pterodactyl Defense — all variations and ECO codes

33 named lines across 4 ECO codes (A40–B27), spanning ECO volumes A, B. Source: the CC0-licensed lichess.org opening database.

The main line

How the main line scores at your rating

Real Lichess win rates for 1.Nf3 c5 2.c4 g6 3.d4 Bg7 4.e4 Qa5+ 5.Nc3 d6, playing as black — the family's other variations are not separately tracked for win rate yet, main line only.

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All 33 named variations

Every named line in the Pterodactyl Defense family, from the CC0-licensed ECO classification — not separately tracked for win rate, but every ECO code and move sequence is real, sourced data.

• A42Pterodactyl Defense (main line) — 1.Nf3 c5 2.c4 g6 3.d4 Bg7 4.e4 Qa5+ 5.Nc3 d6

• Central

  • A40Benoni Beefeater Pterodactyl — 1.d4 g6 2.c4 Bg7 3.Nc3 c5 4.d5 d6 5.e4 Bxc3+ 6.bxc3 Qa5
  • A40Benoni Pterodactyl — 1.d4 g6 2.c4 Bg7 3.e4 c5 4.d5 Qa5+
  • A42Bogolubovia — 1.d4 g6 2.c4 Bg7 3.e4 d6 4.Nc3 c5 5.Nge2 Qa5
  • B06Anhanguera — 1.e4 g6 2.d4 Bg7 3.c4 c5 4.Nc3 d6 5.Be3 Qa5
  • B06Benoni Quetzalcoatlus — 1.e4 g6 2.d4 Bg7 3.c4 c5 4.d5 d6 5.Nc3 Qa5
  • B06Quetzalcoatlus Gambit — 1.e4 g6 2.d4 Bg7 3.c4 c5 4.Nc3 d6 5.dxc5 Qa5

• Fianchetto

  • A40Queen Benoni Pterodactyl — 1.d4 g6 2.c4 Bg7 3.Nc3 c5 4.d5 Qa5
  • A40Queen Pteranodon — 1.d4 g6 2.c4 Bg7 3.Nc3 c5 4.d5 Bxc3+ 5.bxc3 Qa5
  • A40Queen Pterodactyl — 1.d4 g6 2.Nf3 Bg7 3.g3 c5 4.Bg2 Qa5+
  • B06King Pterodactyl — 1.e4 g6 2.d4 Bg7 3.g3 c5 4.Nf3 Qa5+
  • B06Rhamphorhynchus — 1.e4 g6 2.d4 Bg7 3.g3 c5 4.dxc5 Qa5+

• Queen Pterodactyl

  • A40Quiet Line — 1.d4 g6 2.c4 Bg7 3.Nc3 c5 4.e3

• Austrian

  • B06Austriadactylus Western — 1.e4 g6 2.d4 Bg7 3.f4 c5 4.Nf3 Qa5+
  • B06Grand Prix Pterodactyl — 1.e4 g6 2.Nc3 Bg7 3.f4 c5 4.Nf3 Qa5
  • B06Pteranodon — 1.e4 g6 2.d4 Bg7 3.f4 c5 4.c3 Qa5

• Eastern

  • B06Anhanguera — 1.e4 g6 2.d4 Bg7 3.Nc3 c5 4.Be3
  • B06Benoni — 1.d4 g6 2.e4 Bg7 3.Nc3 c5 4.d5
  • B06Benoni Pteranodon — 1.e4 g6 2.d4 Bg7 3.Nc3 c5 4.d5 Bxc3+ 5.bxc3 Qa5
  • B06Benoni Pterodactyl — 1.d4 g6 2.Nc3 Bg7 3.e4 c5 4.d5 Qa5
  • B06Pteranodon — 1.e4 g6 2.d4 Bg7 3.Nc3 c5 4.dxc5 Bxc3+ 5.bxc3 Qa5
  • B06Rhamphorhynchus — 1.e4 g6 2.d4 Bg7 3.Nc3 c5 4.dxc5 Qa5

• Sicilian

  • B06Quetzalcoatlus — 1.e4 g6 2.d4 Bg7 3.Nc3 c5 4.Nf3 Qa5 5.Be2 d6
  • B06Siroccopteryx — 1.e4 g6 2.d4 Bg7 3.Nc3 c5 4.Nf3 Qa5 5.Bc4
  • B27Anhanguera — 1.e4 c5 2.Nf3 g6 3.d4 Bg7 4.Nc3 Qa5 5.Be3
  • B27Benoni Gambit — 1.e4 c5 2.Nf3 g6 3.d4 Bg7 4.Nc3 Qa5 5.d5
  • B27Pteranodon — 1.e4 c5 2.Nf3 g6 3.d4 Bg7 4.dxc5 Qa5+ 5.Nc3 Bxc3+ 6.bxc3
  • B27Rhamphorhynchus — 1.e4 c5 2.Nf3 g6 3.d4 Bg7 4.dxc5 Qa5+ 5.Nc3
  • B27Unpin — 1.e4 c5 2.Nf3 g6 3.d4 Bg7 4.Nc3 Qa5 5.Bd2

• Western

  • B06Anhanguera — 1.e4 g6 2.d4 Bg7 3.Nf3 c5 4.Be3 Qa5+
  • B06Siroccopteryx — 1.e4 g6 2.Nf3 Bg7 3.d4 c5 4.Bc4 cxd4 5.Nxd4 Qa5+
  • B27Pterodactyl — 1.e4 c5 2.Nf3 g6 3.c3 Bg7 4.d4 Qa5
  • B27Rhamphorhynchus — 1.e4 c5 2.Nf3 g6 3.d4 Bg7 4.dxc5 Qa5+

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