HgMan wrote on 05/24/06 at 03:19:24:
White can plan to play the Catalan along a series of different move orders, starting at move 1 with 1 d4, 1 c4, or 1 Nf3. It seems as though it boils down to a matter of preference and which lines White wants to avoid. Does anyone have any particular insight on how White might most sensibly enter into the Catalan? I've noticed that Gelfand tends to play 1 d4, 2 Nf3. Presumably, the English (1 c4) runs the risk of running into 1 ... e5. 1 Nf3?
I don't think that the relative merits of 1. d4, 2. c4 versus 1. d4 2. Nf3, 1. Nf3 2. c4, or 1. c4 is one that interracts too much with one's intention to play the Catalan. Personally I think 1. d4 is the strongest move on the board, certainly the best way of trying to get a Queen's Gambit. 1. Nf3 c5 2. c4 commits one to a Symmetrical English and allows various hedgehog ideas, including the Accelerated Dragon. This seems to me to be a high price to pay for the extra flexibility. Likewise if 1. c4 then White has to face not only 1...c5 but also 1...e5.
But a very key question for the prospective Catalan player is what to do after 1...Nf6, 2...e6 if White's pawn is alread on d4. If his knight is on f3 by the third move, he must be ready to confront the Markovich6. The only way to play the Catalan and avoid the Markovich6 is to play 1. d4 Nf6 2. c4 e6 3. g3, a move order that then runs into 3...c5. This either leads to a Symmetrical English where Black is committed to ...e6, or to the not-very exciting fianchetto Benoni. I suspect the former is objectively the better way for White to try for the win, but I'm not sure if it's better than just playing 3. Nf3 and allowing the Markovich6 (and, presumably, playing the Main Line Benoni).