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A40

Queen's Pawn Game: Modern Defense

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Overview

Queen's Pawn Game: Modern Defense 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.

The line arises from 2 plies — specifically the moves 1. d4 g6.

It branches immediately from Queen's Pawn Game in the opening tree.

14 distinct sub-variations branch from this opening; prominent examples include Colle System: Pterodactyl Variation, Colle System: Siroccopteryx Variation, Modern Defense, and others.

Together the deeper variations number 17 across the full subtree.

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ECO code
A40
Group
Flank Openings (A)
Plies
2
Parent
Queen's Pawn Game
Direct variations
14
Total in subtree
17

This overview is generated automatically from the opening's metadata. A more detailed, human-written description is on the way — and you can speed it up by suggesting one yourself.

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Variations (14)

Related variations at the same level

Sister lines that share the same parent Queen's Pawn Game:

Show all 17 sub-variations (full subtree)

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