Hi,

I'm curious, for those who play the trompowsky after 1 ... Nf3, what do you play for other openings (like 1 ... d5, or 1 ... e6).

Depends on why you are playing the Tromp.  Is this the line you want?  Back when I played the Tromp, I wanted to play the Queen's Gambit not Indian defenses.  I would play 2. c4 against 1... d5.  Against 1.... e6 it depended on my mood, again, either 2.  c4 knowing either d5 or Nf6 would normally follow (but you must be ready for 1. d4 e6 2. c4 c5) or 2.  e4 and play a French (Franco-Benoni isn't really a problem -1. d4 e6 2. e4 c5). 

If the Tromp is what you like, as the Tromp rather than an avoidance line,  you can try 1. d4 d5 2.  Bg5... or 2. Nf3 ... looking for an early Bg5. 

Thanks, I was thinking of it as more of the main line I wanted to play.  The goal would be to minimize the ammount of opening theory.

Your suggestions of 1. d4 d5 2. Bg5 sounds good.   My limited experience is that 1. d4 d5 2 Nf3 opens the door for lot's of 2nd and 3rd move alternatives for Black, where maybe 1 d4 d5 2. Bg5 stays a bit in the realm of the trompowsky - although not sure if my reasoning makes much sense.

Once White plays Nf3, it's not a Tromp, it becomes a Torre if White plays Bg5.  Perfectly playable but with many differences from the Tromp.

The advantage of 1 d4 d5  2 Bg5 is that Black's best move is 2...Nf6 - if he tries to get fancy and take advantage of the Bishop he often goes astray.  The disadvantage is that the position after 2...Nf6 transposes into Black's most solid defense against the Tromp, and makes it difficult to get an edge in the opening.

The Franco-Benoni 1 d4 e6  2 e4 c5 is weak due to the simple 3 d5.  White obtains a Benoni structure without wasting time on c2-c4xd5 and can play, after 3...exd5  4 exd5 d6, 5 Nc3 with excellent prospects.  So Black is best off either opting for a French with 2 ... d5 if he plays that, or avoiding 1 ...e6 altogether.

Thanks.

I've noticed that it's hard to find any books dealing with the move order 1 d4 d5 2 Bg5.  I assume that's still the case .?.

1.d4 d5 2.Bg5 is dubious. That's why;

You might like the Torre attack which is 1.d4 d5 2.Nf3 Nf6 3.Bg5, although it seems a bit wasteful to pick an opening just to play Bg5. 

 1.d4 d5 2.Bg5 is not dubious at all. It's the Levitsky Attack I use it all the time.