Library/Openings/Pterodactyl Defense ECO A42
Opening· 10 plies

Pterodactyl Defense

An entry in the Encyclopedia of Chess Openings (ECO A42), reached after 10 half-moves: 1. Nf3 c5 2. c4 g6 3. d4 Bg7 4. e4 Qa5+ 5. Nc3 d6.

Pterodactyl Defense ECO A42
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Black rook
Black knight
Black bishop
Black king
Black knight
Black rook
Black pawn
Black pawn
Black pawn
Black pawn
Black bishop
Black pawn
Black pawn
Black pawn
Black queen
Black pawn
White pawn
White pawn
White pawn
White knight
White knight
White pawn
White pawn
White pawn
White pawn
White pawn
White rook
White bishop
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 is an opening in the Encyclopedia of Chess Openings, classified under code A42. ECO group A (A00–A99) covers flank and irregular openings, including the English, Bird, Réti and Dutch defences. This particular variation is reached after 10 half-moves from the starting position, with the move sequence 1. Nf3 c5 2. c4 g6 3. d4 Bg7 4. e4 Qa5+ 5. Nc3 d6.

The opening sequence in prose form: 1.Nf3 c5, 2.c4 g6, 3.d4 Bg7, 4.e4 Qa5+, 5.Nc3 d6. 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.