クイーンズ・ギャンビット・ディクラインド
主な変化

1．d4　d5　2．c4　e6で始まるゲームである。非常に長い歴史を持つオープニングの一つで、さらに1つ1つ分けてもよいくらい膨大な数の変化がある。
1．d4　d5　2．c4　e6　3．Nc3　Nf6　4．Bg5　Be7　5．e3　0-0（オーソドックス・ディフェンス）
1．d4　d5　2．c4　e6　3．Nc3　Nf6　4．Bg5　Be7　5．e3　h6　6．Bh4　b6（ボンダレフスキー・マカゴノフ・システム）
1．d4　d5　2．c4　e6　3．Nc3　Nf6　4．Bg5　Be7　5．e3　0-0　6．Nf3　h6　7．Bh4　Ne4（ラスカー・ディフェンス）
1．d4　d5　2．c4　e6　3．Nc3　Nf6　4．Bg5　Nbd7（ケンブリッジ・スプリングス・ヴァリエーション）
1．d4　d5　2．c4　e6　3．Nc3　Nf6　4．cd　ed（エクスチェンジ・ヴァリエーション）
1．d4　d5　2．c4　e6　3．Nc3　c5（タラッシュ・ディフェンス）
1．d4　d5　2．c4　e6　3．Nc3　Nf6　4．Nf3　c5（セミ・タラッシュ・ディフェンス）
1．d4　d5　2．c4　e6　3．Nc3　Nf6　4．Nf3　Bb4（ラゴズィン・システム）
1．d4　d5　2．c4　e6　3．Nf3　Nf6　4．Bg5　Bb4+（ヴィエナ・ヴァリエーション）
1．d4　d5　2．c4　e6　3．Nc3　Be7（ペトロシアン・ヴァリエーション）
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