C48Black34 book lines continue
Spanish Variation, Rubinstein Variation
Four Knights Game1. e4 e5 2. Nf3 Nc6 3. Nc3 Nf6 4. Bb5 Nd4
Also known as Four Knights: Rubinstein Countergambit, Four Knights Game, Spanish Variation, Rubinstein Variation, 4 Knights.