A tactical win (Against a 1900+!!! yay me :P)
c4 is very playable here... as is it in the french (by the way) ... I don't personally play the french but I was recently anihilated by an international correspondence master in a line where he played c4 with the idea of backing my bishop.
There are many reasons to play c4 in the given "pawn structure": taking advantage of a weakened b3 square, fixing in place doubled c pawns, or winning material, but, never to just move a bishop. I'd bet money there was some "extra" feature in the position (against the master) which justified the move. In contrast, your opponent here did it, it seems, just to attack your bishop-which, is not worth closing up the side he had more space on. Congrats on the win! Nice play.
i have no idea what you guys are talking about, that is why I am a struggling 1300(ish) baffoon. help.
Ojx