anyone having experience with the Marshall Gambit in the Queen's Gambit Declined?
i'm talking about this line - 1.d4 d5 2.c4 e6 3.Nc3 c6 4.e4!?
know most people play the (semi) slav these days, still it would be nice to have a surprise weapon against the QGD, and it is perhaps possible to reach it from the move order 1.d4 d5 2.c4 c6 3.Nc3 e6?! 4.e4!?
saw a recent master level game played in Sarajevo this year
I think this variation is still considered OK for white. I'm almost sure there's not a well-worked out variation that spoils whites fun completely.
Its main disadvantage is that you don't usually see black's move order - normally he plays 3 ... Nf6. A few players try to sneak into the Dutch this way (not playing Nf6), and avoid some of the modern dutch variations where white plays g3 and Nh3, so you can cross black up if he's trying for that. Otherwise, black just about has to want to allow white to play this.