411 REFERENCE · Wikibooks
Chess Opening Theory/1. d4/1...d5/2. c4/2...e6/3. Nc3/3...c6/4. e4/4...dxe4/5. Nxe4
Reference material by Wikibooks contributors. This retains its source identity and is not 411 news reporting.
Semi-Slav defence: Marshall gambit Marshall gambit
5. Nxe4
Any move other than 5...Bb4+ is generally unfavorable for Black.
Theory table
5. ... Bb4+ 6. Bd2 Qxd4 7. Bxb4 Qxe4+ unclear
See also
Semi-Slav Defense Marshall_Gambit