all ▁Def ense ) ▁( D 0 6 ) ▁▁ 2 ... g 6 ? ! ▁( A le kh ine ▁idea ) ▁( D 0 6 ) ▁ ▁Techn ically , ▁any ▁Black ▁response ▁other ▁than ▁ 2 ... dx c 4 ▁( or ▁another ▁line ▁with ▁an ▁early ▁... dx c 4 ▁that ▁trans poses ▁into ▁the ▁Q GA ) ▁is ▁a ▁Queen ' s ▁G amb it ▁Dec lined , ▁but ▁the ▁S lav , ▁Al bin ▁C ounter g amb it , ▁and ▁Ch ig or in ▁Def ense ▁are ▁generally ▁treated ▁separately . ▁There ▁are ▁so ▁many ▁Q G D ▁lines ▁after ▁ 2 ... e 6 , ▁that ▁many ▁of ▁them ▁are ▁distinct ive ▁enough ▁to ▁war rant ▁separate ▁treatment . ▁ ▁The ▁Orth odox ▁Def ense ▁and ▁the ▁T arr as ch ▁Def ense ▁are ▁two ▁important ▁examples . ▁ ▁See ▁Queen ' s ▁G amb it ▁Dec lined ▁for ▁more . ▁▁ ▁There ▁are ▁many ▁other ▁possible ▁responses : ▁ ▁The ▁S lav ▁Def ense ▁is ▁a ▁solid ▁response , ▁although ▁many ▁variations ▁are ▁very ▁tact ical . ▁If ▁Black ▁plays ▁both ▁... c 6 ▁and ▁... e 6 ▁( in ▁either ▁order ), ▁the ▁opening ▁takes ▁characteristics ▁of ▁both ▁the ▁S lav ▁and ▁the ▁Orth odox ▁Def ense ▁and ▁is ▁class ified ▁as ▁a ▁Sem i - S lav ▁Def ense . ▁ ▁The ▁Al bin ▁C ounter g amb it ▁is ▁a ▁sharp ▁attempt ▁for ▁Black ▁to ▁gain ▁the ▁initi ative . ▁It