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Trompowsky Attack: Borg Variation is a chess opening that arises after 1.d4 Nf6 2.Bg5 Ne4 3.Bf4 g5. It is classified A45 in the ECO system, and the position after these moves has white to move. The Trompowsky Attack develops the bishop to g5 on move two, before Black can settle into a Nimzo-Indian, King's Indian, or Grünfeld. It is an anti-Indian system chosen primarily to cut down the amount of theory a 1.d4 player has to learn.
Practical rather than ambitious. White is not chasing an opening advantage so much as reaching an original middlegame where general understanding matters more than preparation.
1.d4 players who want to avoid the enormous body of Indian Defense theory without giving up a playable game.
This line is a variation within the Trompowsky Attack family. The strategic ideas above describe the family as a whole; this particular line reaches them by the move order 1.d4 Nf6 2.Bg5 Ne4 3.Bf4 g5.