Library/Openings/Pterodactyl Defense/Western/Siroccopteryx ECO B06
Opening· 10 plies

Pterodactyl Defense: Western, Siroccopteryx

An entry in the Encyclopedia of Chess Openings (ECO B06), reached after 10 half-moves: 1. e4 g6 2. Nf3 Bg7 3. d4 c5 4. Bc4 cxd4 5. Nxd4 Qa5+.

Pterodactyl Defense: Western, Siroccopteryx ECO B06
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Black rook
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Black bishop
Black king
Black knight
Black rook
Black pawn
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Black bishop
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Black queen
White bishop
White knight
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White pawn
White pawn
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White rook
White knight
White bishop
White queen
White king
White rook
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End of this line

No further variations branch from this position in our database. To explore neighbouring ideas:

About this opening

Pterodactyl Defense: Western, Siroccopteryx is an opening in the Encyclopedia of Chess Openings, classified under code B06. ECO group B (B00–B99) covers semi-open games (1.e4 with Black playing anything other than 1…e5), with the Sicilian, French, Caro-Kann and Pirc/Modern at its heart. This particular variation is reached after 10 half-moves from the starting position, with the move sequence 1. e4 g6 2. Nf3 Bg7 3. d4 c5 4. Bc4 cxd4 5. Nxd4 Qa5+.

It belongs to the Pterodactyl Defense family. Within that family this is a level-2 branch (the Western → Siroccopteryx line).

The opening sequence in prose form: 1.e4 g6, 2.Nf3 Bg7, 3.d4 c5, 4.Bc4 cxd4, 5.Nxd4 Qa5+. From this position the encyclopaedia records no further canonical continuations — practical play branches into unnamed transpositions or returns to the parent line for alternative ideas.