411 REFERENCE · Wikibooks
Chess Opening Theory/1. d4/1...d5/2. c4/2...e6/3. Nc3/3...c6/4. e4/4...dxe4/5. Nxe4/5...Bb4/6. Bd2/6...Qxd4
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Semi-Slav defence: Marshall gambit Marshall gambit
6...Qxd4
Black takes the gambitted pawn and will be up material for the time being. This opening doesn't come without compensation for White. After /7. Bxb4/ White will have dominance over Black's weakened dark squares.
Theory table
7. Bxb4 Qxe4+ 8. Be2 unclear 7. ... ... 8. Ne2 unclear
See also
Semi-Slav Defense Marshall_Gambit