The Torre Attack is 1.d4 Nf6/d5 2.Nf3 any normal move by Black 3.Bg5.
According to Lars Bo Hansen in 'How Chess Games are Won and Lost', an opening must meet three conditions:
Quote:1) The opening repertoire must be reasonably sound from a pure chess perspective.
2) The opening repertoire must be tailor-made to fit your style.
3) The opening repertoire must fit your present playing strength - and evolve with it.
1) The Torre can be considered a 'reasonably sound' opening, and one advantage is that you become an expert in the pawn structures that comprise the Torre opening complex. However, at GM level this opening is not very effective as Black usually equalizes out of the opening. The majority of White's wins in this variation are not the result of the opening.
2) The Torre Attack best suits a player who likes a mobile or fixed pawn structure, who wants a more manoeuvring game and prefers more tranquil waters. Players with a stronger strategic intuition than specific intuition who just want to reach a playable middlegame would be suited to this opening.
3) Up to 2200-2300, all normal openings are applicable, but to pass the 2300 barrier, it is necessary to replace the Torre with main line openings. Then the Torre can only be used as a surprise weapon, and even then it can backfire. Kamsky-Gelfand, Elista 2007 (3) is a good example of this even though the opening was a London, not a Torre.
The best antidote against the Torre varies depending on your repertoire. 1...d5 players have little to worry about since 1.d4 d5 2.Nf3 Nf6 3.Bg5 Ne4! already gives Black the easier game, and Noteboom/Dutch players also have little to worry about.
For KID/Grunfeld players, after 1.d4 Nf6 2.Nf3 g6 3.Bg5 I recommend 3...Bg7 4.Nbd2 0-0 5.c3 (5.e4 d5!) 5...d6 6.e4 and now both 6...c5 and 6...Nbd7/7...Qe8/8...e5 are equal.
I advise Nimzo/QID players to play 1.d4 Nf6 2.Nf3 e6 3.Bg5 h6 4.Bh4 d6!?, which leads to interesting play; 4.Bf6 Qf6 5.e4 d6 is fairly innocuous but probably best.
Benoni players have an easy time against the Torre since 1.d4 Nf6 2.Nf3 c5 3.Bg5 is dubious and 3.c3 d5 4.Bg5 Ne4! transposes to the favourable 1...d5 lines.
Finally, the Torre is ineffective against the Modern because of 1...g6 2.Nf3 Bg7 3.Bg5 f6!? 4.Bh4 (4.Bf4 d6 and 5...e5 is even a tad more comfortable for Black) 4...d6 5.e4 (5.Nbd2 Nd7 6.e3 e5 7.c4 Nh6 or 7...Ne7 is an improved KID) 5...Nd7 6.Bc4 Nh6 7.0-0 e5 and Black is no worse. If White plays 6.d5 to dissuade ...e5, Black can either play 6...e5 7.de6 Nc5 with good counterplay or play more creatively but riskily with 6...Nc5!? 7.Nc3 f5, which may or may not be good.