Some help in the London System

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RobKing

Here is a game that I played this past week against a player rated about 1970 (was > 2000 before I beat him last month and he lost many points). He always plays the London System as White and this was my attempt at playing against it. I had some trouble forming a real plan or seeing where my advantages would come from. He made a "sacrifice" that I really think I could have taken advantage of but I didn't. Please advise and comment.

checkmateisnear