ECO E32 · Nimzo-Indian Defense
Nimzo-Indian Defense: Classical Variation, Keres Defense
The position after 1.d4 Nf6 2.c4 e6 3.Nc3 Bb4 4.Qc2 O-O 5.a3 Bxc3+ 6.Qxc3 b6.
1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. Qc2 O-O 5. a3 Bxc3+ 6. Qxc3 b6
Nimzo-Indian Defense: Classical Variation, Keres Defense is filed under ECO E32, a variation of Nimzo-Indian Defense: Classical Variation. It is the position after 1.d4 Nf6 2.c4 e6 3.Nc3 Bb4 4.Qc2 O-O 5.a3 Bxc3+ 6.Qxc3 b6 — 12 half-moves in, with White to move. Named theory ends here; beyond this the position is yours to work out.