Colle System: Rhamphorhynchus Variation
ECO A04 ยท Colle System
The Colle System: Rhamphorhynchus Variation (A04) is a chess opening in the Colle System family, played by White. It arises after the moves 1. Nf3 c5 2. e3 g6 3. d4 Bg7 4. dxc5 Qa5+.
Moves: 1. Nf3 c5 2. e3 g6 3. d4 Bg7 4. dxc5 Qa5+
About this opening
The Rhamphorhynchus variation is a cousin of the Pterodactyl, reached via a move order where White captures on c5 before Black replies with the ...Qa5+ check to regain the pawn. Black banks on the fianchetto and counterplay on the long diagonal in an asymmetrical position. With its prehistoric name, it is a rare, eccentric line, favored by players seeking originality.