411 REFERENCE · Wikibooks
Chess Opening Theory/1. d4/1...d5/2. c4/2...e6/3. Nc3/3...c6/4. e4
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Semi-Slav defence: Marshall gambit Queen's gambit declined
4. e4 · Marshall gambit
This move controls the center and creates a huge pawn roller. Black's c8-bishop will be blocked and inactive for some time. However, White will have to sacrifice a pawn in a few moves if they want to fight for the edge. Black hasn't moved a single piece yet and put all their central pawns on light squares. White quickly got e4 in.
Theory table
4. ... dxe4 5. Nxe4 Bb4+ 6. Bd2 Qxd4 4. ... Bb4?!
Semi-Slav Defense