Human: Why is the Trompowsky Attack with 2. Bg5. 1... d5 (Closed Game) better than the other two alternatives? Assistant: 
The Trompowsky Attack with 2. Bg5. 1... d5 (Closed Game) is better than the other two alternatives because it prevents White from playing 2. e4 unless White wants to venture the dubious Blackmar–Diemer Gambit. 1... d5 is not any worse than 1... Nf6, but committing the pawn to d5