E23 — Nimzo-Indian Defense: Spielmann Variation, Romanovsky Gambit

ECO E23 covers Nimzo-Indian Defense: Spielmann Variation, Romanovsky Gambit and related lines (Nimzo-Indian Defense: Spielmann Variation, Romanovsky Gambit, Nimzo-Indian Defense: Spielmann Variation, Carlsbad Variation, Nimzo-Indian Defense: Spielmann Variation, Stahlberg Variation). Main line 1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. Qb3 c5 5. dxc5 Nc6 with variations, statistics, and the best responses.