E20 - E29

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------------------------------------ E20 ------------------------------------
E20 Nimzo-Indian defence
1.d2d4 g8f6 c2c4 e7e6 b1c3 f8b4
   E20 Nimzo-Indian: Kmoch variation
   1.d2d4 g8f6 c2c4 e7e6 b1c3 f8b4 f2f3
   E20 Nimzo-Indian: Mikenas attack
   1.d2d4 g8f6 c2c4 e7e6 b1c3 f8b4 d1d3
   E20 Nimzo-Indian: Romanishin-Kasparov (Steiner) system
   1.d2d4 g8f6 c2c4 e7e6 b1c3 f8b4 g2g3
------------------------------------ E21 ------------------------------------
E21 Nimzo-Indian: three knights variation
1.d2d4 g8f6 c2c4 e7e6 b1c3 f8b4 g1f3
   E21 Nimzo-Indian: three knights, Korchnoi variation
   1.d2d4 g8f6 c2c4 e7e6 b1c3 f8b4 g1f3 c7c5 d4d5
      E21 Nimzo-Indian: three knights, Euwe variation
      1.d2d4 g8f6 c2c4 e7e6 b1c3 f8b4 g1f3 c7c5 d4d5 f6e4

------------------------------------ E22 ------------------------------------

E22 Nimzo-Indian: Spielmann variation

1.d2d4 g8f6 c2c4 e7e6 b1c3 f8b4 d1b3

 

------------------------------------ E23 ------------------------------------

E23 Nimzo-Indian: Spielmann, 4...c5, 5.dc Nc6

1.d2d4 g8f6 c2c4 e7e6 b1c3 f8b4 d1b3 c7c5 d4c5 b8c6

   E23 Nimzo-Indian: Spielmann, Karlsbad variation

   1.d2d4 g8f6 c2c4 e7e6 b1c3 f8b4 d1b3 c7c5 d4c5 b8c6 g1f3 f6e4 c1d2 e4d2

   E23 Nimzo-Indian: Spielmann, San Remo variation

   1.d2d4 g8f6 c2c4 e7e6 b1c3 f8b4 d1b3 c7c5 d4c5 b8c6 g1f3 f6e4 c1d2 e4c5

      E23 Nimzo-Indian: Spielmann, Staahlberg variation

      1.d2d4 g8f6 c2c4 e7e6 b1c3 f8b4 d1b3 c7c5 d4c5 b8c6 g1f3 f6e4 c1d2 e4c5

        b3c2 f7f5 g2g3

 

------------------------------------ E24 ------------------------------------

E24 Nimzo-Indian: Saemisch variation

1.d2d4 g8f6 c2c4 e7e6 b1c3 f8b4 a2a3 b4c3 b2c3

   E24 Nimzo-Indian: Saemisch, Botvinnik variation

   1.d2d4 g8f6 c2c4 e7e6 b1c3 f8b4 a2a3 b4c3 b2c3 c7c5 f2f3 d7d5 e2e3 e8g8

     c4d5 f6d5

 

------------------------------------ E25 ------------------------------------

E25 Nimzo-Indian: Saemisch variation

1.d2d4 g8f6 c2c4 e7e6 b1c3 f8b4 a2a3 b4c3 b2c3 c7c5 f2f3 d7d5 c4d5

   E25 Nimzo-Indian: Saemisch, Keres variation

   1.d2d4 g8f6 c2c4 e7e6 b1c3 f8b4 a2a3 b4c3 b2c3 c7c5 f2f3 d7d5 c4d5 f6d5

     d4c5

      E25 Nimzo-Indian: Saemisch, Romanovsky variation

      1.d2d4 g8f6 c2c4 e7e6 b1c3 f8b4 a2a3 b4c3 b2c3 c7c5 f2f3 d7d5 c4d5 f6d5

        d4c5 f7f5

 

------------------------------------ E26 ------------------------------------

E26 Nimzo-Indian: Saemisch variation

1.d2d4 g8f6 c2c4 e7e6 b1c3 f8b4 a2a3 b4c3 b2c3 c7c5 e2e3

   E26 Nimzo-Indian: Saemisch, O'Kelly variation

   1.d2d4 g8f6 c2c4 e7e6 b1c3 f8b4 a2a3 b4c3 b2c3 c7c5 e2e3 b7b6

 

------------------------------------ E27 ------------------------------------

E27 Nimzo-Indian: Saemisch variation

1.d2d4 g8f6 c2c4 e7e6 b1c3 f8b4 a2a3 b4c3 b2c3 e8g8

 

------------------------------------ E28 ------------------------------------

E28 Nimzo-Indian: Saemisch variation

1.d2d4 g8f6 c2c4 e7e6 b1c3 f8b4 a2a3 b4c3 b2c3 e8g8 e2e3

 

------------------------------------ E29 ------------------------------------

E29 Nimzo-Indian: Saemisch, main line

1.d2d4 g8f6 c2c4 e7e6 b1c3 f8b4 a2a3 b4c3 b2c3 e8g8 e2e3 c7c5 f1d3 b8c6

   E29 Nimzo-Indian: Saemisch, Capablanca variation

   1.d2d4 g8f6 c2c4 e7e6 b1c3 f8b4 a2a3 b4c3 b2c3 e8g8 e2e3 c7c5 f1d3 b8c6

     g1e2 b7b6 e3e4 f6e8