Library/Openings/Colle System/Rhamphorhynchus Variation ECO A04
Opening· 8 plies

Colle System: Rhamphorhynchus Variation

An entry in the Encyclopedia of Chess Openings (ECO A04), reached after 8 half-moves: 1. Nf3 c5 2. e3 g6 3. d4 Bg7 4. dxc5 Qa5+.

Colle System: Rhamphorhynchus Variation ECO A04
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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 pawn
Black bishop
Black pawn
Black pawn
Black queen
White pawn
White pawn
White knight
White pawn
White pawn
White pawn
White pawn
White pawn
White pawn
White rook
White knight
White bishop
White queen
White king
White bishop
White rook
8/8
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End of this line

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About this opening

Colle System: Rhamphorhynchus Variation is an opening in the Encyclopedia of Chess Openings, classified under code A04. ECO group A (A00–A99) covers flank and irregular openings, including the English, Bird, Réti and Dutch defences. This particular variation is reached after 8 half-moves from the starting position, with the move sequence 1. Nf3 c5 2. e3 g6 3. d4 Bg7 4. dxc5 Qa5+.

The opening sequence in prose form: 1.Nf3 c5, 2.e3 g6, 3.d4 Bg7, 4.dxc5 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.