Alekhine's Defence, Modern Variation, 4...Bg4 Notation: 1. e4 Nf6 2. e5 Nd5 3. d4 d6 4. Nf3 Bg4
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