Hey,
I've been thinking about learning the Marshall attack. Right now I play c5 against e4 always, mainly because I didn't want to learn the Ruy, but not wanting to learn only gets you so far ;^)
So he deviated from book at B x Nd4. At first glance, I like that move as it simplifies a bit, and gives you an isolated pawn. It also makes him look more behind in development, and gives you the bishop pair-- both of which can't be good in an open game.
For me, the worst thing that happens when my opponent goes off the books I learned from is that it often exposes the shallowness of my understanding of what I've been playing. I am very much speaking for myself here, not knocking anyone. What I like about being rated in the 12's here in blitz is that I have to deal with the craziest moves early on and either push 'em back or get killed in what ought to be a bad opening.
I'm sure you looked at the game explorer here and found in from the position after Qf3 that Bf4 is really good for Black no matter what white does. I'm hesitant to offer any suggestions as you're way higher rated than me, but I think there has to be something that you're way ahead on tempii and have the bishop pair in an open game. As I looked at your game I kept thinking of ways to sac something or through the king side pawns at him.
I wish I had more-- or "something" actually-- to offer, but thanks for sharing the game and I feel encouraged to learn the Marshall.
So I recently played the ruy lopez marshall attack. The first 10 or 15 moves I was following book moves then all of a sudden my oppenent stopped playing book moves and I was in trouble. I was playing black and I was lost. I had to fight back from a lost postion and draw it out. well here it is please comment thanks
http://www.chess.com/echess/game.html?id=29776208