E50 - E59

------------------------------------ E50 ------------------------------------

E50 Nimzo-Indian: 4.e3 e8g8, 5.Nf3, without ...d5

1.d2d4 g8f6 c2c4 e7e6 b1c3 f8b4 e2e3 e8g8 g1f3

------------------------------------ E51 ------------------------------------

E51 Nimzo-Indian: 4.e3 e8g8, 5.Nf3 d7d5

1.d2d4 g8f6 c2c4 e7e6 b1c3 f8b4 e2e3 e8g8 g1f3 d7d5

   E51 Nimzo-Indian: 4.e3, Ragozin variation

   1.d2d4 g8f6 c2c4 e7e6 b1c3 f8b4 e2e3 e8g8 g1f3 d7d5 f1d3 b8c6 e1g1 d5c4

------------------------------------ E52 ------------------------------------

E52 Nimzo-Indian: 4.e3, main line with ...b6

1.d2d4 g8f6 c2c4 e7e6 b1c3 f8b4 e2e3 e8g8 g1f3 d7d5 f1d3 b7b6

------------------------------------ E53 ------------------------------------

E53 Nimzo-Indian: 4.e3, main line with ...c5

1.d2d4 g8f6 c2c4 e7e6 b1c3 f8b4 e2e3 e8g8 g1f3 d7d5 f1d3 c7c5

   E53 Nimzo-Indian: 4.e3, Keres variation

   1.d2d4 g8f6 c2c4 e7e6 b1c3 f8b4 e2e3 e8g8 g1f3 d7d5 f1d3 c7c5 e1g1 b7b6

   E53 Nimzo-Indian: 4.e3, Gligoric system with 7...Nbd7

   1.d2d4 g8f6 c2c4 e7e6 b1c3 f8b4 e2e3 e8g8 g1f3 d7d5 f1d3 c7c5 e1g1 b8d7

------------------------------------ E54 ------------------------------------

E54 Nimzo-Indian: 4.e3, Gligoric system with 7...dc

1.d2d4 g8f6 c2c4 e7e6 b1c3 f8b4 e2e3 e8g8 g1f3 d7d5 f1d3 c7c5 e1g1 d5c4

  d3c4

   E54 Nimzo-Indian: 4.e3, Gligoric system, Smyslov variation

   1.d2d4 g8f6 c2c4 e7e6 b1c3 f8b4 e2e3 e8g8 g1f3 d7d5 f1d3 c7c5 e1g1 d5c4

     d3c4 d8e7

------------------------------------ E55 ------------------------------------

E55 Nimzo-Indian: 4.e3, Gligoric system, Bronstein variation

1.d2d4 g8f6 c2c4 e7e6 b1c3 f8b4 e2e3 e8g8 g1f3 d7d5 f1d3 c7c5 e1g1 d5c4

  d3c4 b8d7

------------------------------------ E56 ------------------------------------

E56 Nimzo-Indian: 4.e3, main line with 7...Nc6

1.d2d4 g8f6 c2c4 e7e6 b1c3 f8b4 e2e3 e8g8 g1f3 d7d5 f1d3 c7c5 e1g1 b8c6

------------------------------------ E57 ------------------------------------

E57 Nimzo-Indian: 4.e3, main line with 8...dc and 9...cd

1.d2d4 g8f6 c2c4 e7e6 b1c3 f8b4 e2e3 e8g8 g1f3 d7d5 f1d3 c7c5 e1g1 b8c6

  a2a3 d5c4 d3c4 c5d4

------------------------------------ E58 ------------------------------------

E58 Nimzo-Indian: 4.e3, main line with 8...Bxc3

1.d2d4 g8f6 c2c4 e7e6 b1c3 f8b4 e2e3 e8g8 g1f3 d7d5 f1d3 c7c5 e1g1 b8c6

  a2a3 b4c3 b2c3

------------------------------------ E59 ------------------------------------

E59 Nimzo-Indian: 4.e3, main line

1.d2d4 g8f6 c2c4 e7e6 b1c3 f8b4 e2e3 e8g8 g1f3 d7d5 f1d3 c7c5 e1g1 b8c6

  a2a3 b4c3 b2c3 d5c4 d3c4