Openings

Variation
Modern defense
    Averbakh system, Kotov Variation Averbakh system, Randspringer Variation Averbakh system
    Nimzo-Indian
      Saemisch, Keres Variation Saemisch, Botvinnik Variation Spielmann, Staahlberg Variation Spielmann, San Remo Variation Spielmann, Karlsbad Variation Spielmann, 4...c5, 5.dc Nc6 Spielmann Variation Three knights, Euwe Variation Three knights, Korchnoi Variation Three knights Variation Romanishin-Kasparov (Steiner) system Mikenas attack Kmoch Variation 4.e3, Main line 4.e3, Main line with 8...Bxc3 4.e3, Main line with 8...dc and 9...cd 4.e3, Main line with 7...Nc6 4.e3, Gligoric system, Bronstein Variation 4.e3, Gligoric system, Smyslov Variation 4.e3, Gligoric system with 7...dc 4.e3, Gligoric system with 7...Nbd7 4.e3, Keres Variation 4.e3, Main line with ...c5 4.e3, Main line with ...b6 4.e3, Ragozin Variation 4.e3 e8g8, 5.Nf3 d7d5 4.e3 e8g8, 5.Nf3, without ...d5 4.e3, Botvinnik system 4.e3 O-O, 5.Bd3 d5 4.e3 O-O, 5.Bd3 Simagin Variation Reshevsky Variation 4.e3 O-O 4.e3, Bronstein (Byrne) Variation Fischer Variation , 5.Ne2 Fischer Variation 4.e3 c5, 5.Ne2 (Rubinstein) e3, Huebner Variation 4.e3 c5 4.e3, Taimanov Variation 4.e3 Classical, Pirc Variation Classical, 4...c5 Classical, San Remo Variation Classical, Noa Variation , Main line, 7.Qc2 Classical, Noa Variation , Main line Classical, Botvinnik Variation Classical, Noa Variation , 5.a3 Classical, Noa Variation , 5.cd ed Classical, Noa Variation Classical, Milner-Barry (Zurich) Variation Classical, 4...Nc6 Classical, Adorjan gambit Classical Variation Leningrad, Main line Leningrad, ...b5 gambit Leningrad Variation Saemisch, Capablanca Variation Saemisch, Main line Saemisch Variation Saemisch, O'Kelly Variation Saemisch, Romanovsky Variation
      Nimzovich-Larsen attack
        Classical Variation Symmetrical Variation Polish Variation Dutch Variation English Variation Indian Variation Modern Variation
        Old Benoni
          Schmid's system Mujannah formation Franco-Benoni defense
          Old Indian
            Main line Ukrainian Variation , 4.Nf3 Dus-Khotimirsky Variation Ukrainian Variation Janowski Variation Tartakower (Wade) Variation
            Petrov
              Modern attack, Trifunovic Variation Modern attack, Symmetrical Variation Urusov gambit Modern attack, Bardeleben Variation Modern attack, Steinitz Variation Modern attack, Main line Modern (Steinitz) attack Italian Variation Damiano Variation Paulsen attack Cochrane gambit Classical attack, close Variation Classical attack, Marshall trap Classical attack, Tarrasch Variation Classical attack, Marshall Variation Classical attack, Mason Variation Classical attack, Jaenisch Variation Classical attack, Maroczy Variation Classical attack, Krause Variation