Library/Openings/Nimzo-Indian Defense/Sämisch Variation/O'Kelly Variation ECO E26
Opening· 12 plies

Nimzo-Indian Defense: Sämisch Variation, O'Kelly Variation

An entry in the Encyclopedia of Chess Openings (ECO E26), reached after 12 half-moves: 1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. a3 Bxc3+ 5. bxc3 c5 6. e3 b6.

Nimzo-Indian Defense: Sämisch Variation, O'Kelly Variation ECO E26
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End of this line

No further variations branch from this position in our database. To explore neighbouring ideas:

About this opening

Nimzo-Indian Defense: Sämisch Variation, O'Kelly Variation is an opening in the Encyclopedia of Chess Openings, classified under code E26. 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. a3 Bxc3+ 5. bxc3 c5 6. e3 b6.

It belongs to the Nimzo-Indian Defense family. Within that family this is a level-2 branch (the Sämisch Variation → O'Kelly Variation line). The immediate parent line is Nimzo-Indian Defense: Sämisch Variation, transitioned via 6…b6.

The opening sequence in prose form: 1.d4 Nf6, 2.c4 e6, 3.Nc3 Bb4, 4.a3 Bxc3+, 5.bxc3 c5, 6.e3 b6. From this position the encyclopaedia records no further canonical continuations — practical play branches into unnamed transpositions or returns to the parent line for alternative ideas.