Novosibirsk wrote on 01/29/09 at 15:32:09:
According to Starting out Benoni systems
The argument of exchange the light square bishop is that the bishop is quite blocked by the white center pawns. Do white need the bishop ?. Probably for having a safe kings position only.
Also you exchange one piece more which is good when ahead in material. The drawback is of course whites kings position which is worse than in the fianchetto lines.
I once analysed a game with a benko player where I played the fianchetto variation, his thought on variation was that his black bishop is in the way of his forces, and he would like it better to get it exchanged against the f1-bishop.
I don't really know the ultimate truth myself, there are pros and cons in exchanging the lightsquared bishop.
Quote:Because I suspect prospective Benkoers, one need be prepared for the sharp play after 3....cd 4. Nd4 e5 !?.
I think theory says it's bad, but theory probably says the same on the volga, so I do not really know. Tbh. I haven't looked into that gambit.
I play a different move order c4 Nf3, so I do not need to occupy myself with such things (the first tourney I played last year with 1.d4 I played with some knowledge of lines in the John Cox Starting Out: 1d4 book, like QGD, KID, Nimzo, Gruenfeld, Slav, QGA, but on the board I only got sidelines like albin's counter gambit, czech benoni, dutch stonewall, where I basically had to think for myself starting from move 2-5 running into totally prepared opponents, that is why I changed to 1.c4/1.Nf3, there are not so many cheaptricker defences there).