Openings

Variation
QGD
    Charousek (Petrosian) Variation Alapin Variation Janowski Variation 3.Nc3 Hastings Variation Capablanca-Duras Variation Vienna Variation Capablanca Variation Spielmann Variation
    QGD Semi-Slav
      Meran, Rellstab attack Meran, Sozin Variation Meran, Stahlberg Variation Meran, Rabinovich Variation Meran, Blumenfeld Variation Meran, Old Main line Meran, ReynOlds' Variation Meran Meran, Pirc Variation Meran, 8...a6 Meran, Wade Variation neo-Meran (Lundin Variation ) Meran Variation 7.Bc4 Chigorin defense Romih Variation Bogolyubov Variation 6.Bd3 Rubinstein (anti-Meran) system Stoltz Variation 5...Nd7 Accelerated Meran (Alekhine Variation ) Stonewall defense 5.e3 Anti-Meran, Alatortsev system Anti-Meran, Szabo Variation Anti-Meran, Lilienthal Variation Anti-Meran gambit Ekstrom Variation Botvinnik system (anti-Meran) 5.Bg5 dc Hastings Variation
      QGD Slav
        Semmering Variation Dutch, Saemisch Variation Dutch Variation , Main line Dutch Variation Dutch, Lasker Variation Wiesbaden Variation Carlsbad Variation Krause attack Czech defense Steiner Variation Soultanbeieff Variation Smyslov Variation Tolush-Geller gambit Slav gambit 5.e3 (Alekhine Variation ) Schlechter Variation Suechting Variation 4.Nc3 Exchange, Trifunovic Variation Exchange Variation , 6.Bf4 Bf5 Exchange Variation Amsterdam Variation Landau Variation 4.e3 Bf5 4.e3 Breyer Variation 3.Nf3 Winawer counter-gambit
        QGD Slav accepted
          Alapin Variation
          QGD Slav defense
            Exchange Variation
            QP counter-gambit
              Maroczy gambit
              Queen's Indian
                Marienbad system, Berg Variation Marienbad system Old Main line, 9.Qxc3 Old Main line, 7.Nc3 Euwe Variation Old Main line, 6.O-O Opovcensky Variation Anti-Queen's Indian system 5.Bg2 Be7 Riumin Variation Yates Variation Capablanca Variation Buerger Variation Rubinstein Variation 4.g3 Bb7 Nimzovich Variation (exaggerated Fianchetto) 4.g3 Averbakh Variation 4.e3 4.Nc3, Main line 4.Nc3, Botvinnik Variation 4.Nc3 Petrosian system Miles Variation
                Queen's pawn
                  Anti-Veresov Chigorin Variation Stonewall attack Yusupov-Rubinstein system