Library/Openings/Colle System/Siroccopteryx Variation ECO A40
Opening· 10 plies

Colle System: Siroccopteryx Variation

An entry in the Encyclopedia of Chess Openings (ECO A40), reached after 10 half-moves: 1. d4 g6 2. Nf3 Bg7 3. e3 c5 4. Bd3 cxd4 5. Nxd4 Qa5+.

Colle System: Siroccopteryx Variation ECO A40
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Black rook
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Black king
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Black rook
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White knight
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White pawn
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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

Colle System: Siroccopteryx Variation is an opening in the Encyclopedia of Chess Openings, classified under code A40. 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. d4 g6 2. Nf3 Bg7 3. e3 c5 4. Bd3 cxd4 5. Nxd4 Qa5+.

The opening sequence in prose form: 1.d4 g6, 2.Nf3 Bg7, 3.e3 c5, 4.Bd3 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.