Nimzo-Indian, Classical Variation, 4...Nc6 Notation: 1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. Qc2 Nc6
In each game under Location you see masterchessopen.com but it's not a valid website, so please don't use it. Claus Gamborg, Jan. 2023