Nimzo-Indian Defense: Normal Variation, Gligoric System

An entry in the Encyclopedia of Chess Openings (ECO E53), reached after 12 half-moves: 1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. e3 O-O 5. Bd3 d5 6. Nf3 c5.

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7.O-O 5 lines

About this opening

Nimzo-Indian Defense: Normal Variation, Gligoric System is an opening in the Encyclopedia of Chess Openings, classified under code E53. ECO group E (E00–E99) covers Indian defences against 1.d4, covering the Nimzo-Indian, Queen's Indian, King's Indian and Catalan systems. This particular variation is reached after 12 half-moves from the starting position, with the move sequence 1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. e3 O-O 5. Bd3 d5 6. Nf3 c5.

It belongs to the Nimzo-Indian Defense family. Within that family this is a level-2 branch (the Normal Variation → Gligoric System line). The immediate parent line is Nimzo-Indian Defense: Normal Variation, transitioned via 6…c5.

The opening sequence in prose form: 1.d4 Nf6, 2.c4 e6, 3.Nc3 Bb4, 4.e3 O-O, 5.Bd3 d5, 6.Nf3 c5. From this position exactly one named continuation is recorded in the encyclopaedia.