Library/Openings/Pterodactyl Defense/Western/Anhanguera ECO B06
Opening· 8 plies

Pterodactyl Defense: Western, Anhanguera

An entry in the Encyclopedia of Chess Openings (ECO B06), reached after 8 half-moves: 1. e4 g6 2. d4 Bg7 3. Nf3 c5 4. Be3 Qa5+.

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

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About this opening

Pterodactyl Defense: Western, Anhanguera 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 8 half-moves from the starting position, with the move sequence 1. e4 g6 2. d4 Bg7 3. Nf3 c5 4. Be3 Qa5+.

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

The opening sequence in prose form: 1.e4 g6, 2.d4 Bg7, 3.Nf3 c5, 4.Be3 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.