Tree path 3 levels Queen's Pawn Game › Modern Defense › Colle System: Siroccopteryx Variation
- Chess Codex
- Queen's Pawn Game A40
- Modern Defense A40
- Colle System: Siroccopteryx Variation A40 you are here
Colle System: Siroccopteryx Variation
Overview
Colle System: Siroccopteryx Variation is a named branch in the Flank Openings group of chess theory, classified under ECO A40.
The Flank Openings group covers flank openings — systems that delay the central pawn break and instead develop pieces and pawns on the wings.
It is reached after 10 plies of play, with the move sequence 1. d4 g6 2. Nf3 Bg7 3. e3 c5 4. Bd3 cxd4 5. Nxd4 Qa5+.
In the opening tree, this line branches off from Queen's Pawn Game: Modern Defense, part of the broader Queen's Pawn Game system.
Use the board to walk through every move, check how the position has scored on Lichess, or take it head-to-head against Stockfish.
- ECO code
- A40
- Group
- Flank Openings (A)
- Plies
- 10
This overview is generated automatically from the opening's metadata. Know this line well? Write a description — submissions are reviewed before publishing.
Statistics from Lichess
41 games · White 53.7% / Draw 0.0% / Black 46.3%
| Moves | Games | W / D / B |
|---|---|---|
| c3 | 26 | |
| Bd2 | 11 | |
| Nd2 | 2 | |
| Nc3 | 2 |
Source: Lichess Opening Explorer · cached 2026-09-26 02:11:13
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