1d4Nf6Black invites White to enter the expanse of Indian Defences or possibly the Grรผnfeld Defence.2Bg5!...The Trompowsky Attack is an aggressive opening that prevents Black from trying any form of the Indian. It is one of the less analyzed queen's pawn openings so it can lead to tricky off-the-book play.
White aims to trade off their dark-squared bishop for one of Black's best kingside defenders, the f6 knight.