Openings

Variation
Petrov
    Classical attack, Berger Variation Classical attack, Chigorin Variation Classical attack Cozio (Lasker) attack Nimzovich attack Kaufmann attack French attack
    Philidor
      Hanham, Delmar Variation Hanham, Schlechter Variation Hanham, Berger Variation Hanham, Kmoch Variation Hanham, Steiner Variation Hanham, Krause Variation Hanham Variation Nimzovich, Klein Variation Nimzovich, Locock Variation Nimzovich, Rellstab Variation Nimzovich, Sokolsky Variation Nimzovich Variation Nimzovich, Larobok Variation Nimzovich, Sozin Variation Improved Hanham Variation Larsen Variation Berger Variation Exchange Variation Paulsen attack Boden Variation Philidor counter-gambit, Zukertort Variation Philidor counter-gambit, Berger Variation Philidor counter-gambit, del Rio attack Philidor counter-gambit Lopez counter-gambit, Jaenisch Variation Lopez counter-gambit Steinitz Variation
      Pirc
        Austrian attack, Ljubojevic Variation Austrian attack, Dragon formation Austrian attack, 6.Bd3 Austrian attack, 6.Be3 Austrian attack, 6.e5 Austrian attack Classical system, 5.Be2 Classical, h3 system Classical (Two knights) system bayonet (Mariotti) attack Chinese Variation Byrne Variation Holmov system Sveshnikov system 150 attack Ufimtsev-Pytel Variation
        Polish
          Outflank Variation Tuebingen Variation
          Ponziani
            Romanishin Variation Reti Variation Fraser defense Jaenisch counter-attack Steinitz Variation Leonhardt Variation Caro Variation
            QGA
              Classical, Smyslov Variation Classical, 8...Bb7 Classical, Flohr Variation Classical, 7...b5 Classical, 7.Qe2 Classical, Geller Variation Classical, Rubinstein Variation Classical, 6...a6 Classical, Steinitz Variation Classical Variation , 6.O-O Classical, Furman Variation Classical Variation 4...e6 Mannheim Variation Haberditz Variation Alekhine defense, Alatortsev Variation Alekhine defense Alekhine defense, Borisenko-Furman Variation Ericson Variation 3.Nf3 Schwartz defense Linares Variation 3.e4
              QGD
                Stonewall Variation Albin counter-gambit, 5.g3 Albin counter-gambit, Balogh Variation Albin counter-gambit, Janowski Variation Albin counter-gambit, Krenosz Variation Albin counter-gambit, Alapin Variation Albin counter-gambit Albin counter-gambit, Lasker trap Chigorin defense, Janowski Variation Chigorin defense Symmetrical (Austrian) defense Marshall defense Grau (Sahovic) defense Orthodox defense, Classical, 13.de Orthodox defense, Classical, 13.d1c2 (Vidmar) Orthodox defense, Classical, 13.d1b1 (Maroczy) Orthodox defense, Classical Variation Orthodox defense, Bd3 line, 11.O-O