Chess Opening Theory/1. e4/1...e5/2. Nf3/2...Nc6/3. Bb5/3...a6/4. Ba4/4...Nf6/5. O-O/5...Be7/6. Re1/6...b5/7. Bb3/7...O-O/8. c3/8...d5/9. exd5/9...Nxd5/10. Nxe5/10...Nxe5/11. Rxe5/11...c6/12. d4/12...Bd6

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< Chess Opening Theory‎ | 1. e4‎ | 1...e5‎ | 2. Nf3‎ | 2...Nc6‎ | 3. Bb5‎ | 3...a6‎ | 4. Ba4‎ | 4...Nf6‎ | 5. O-O‎ | 5...Be7‎ | 6. Re1‎ | 6...b5‎ | 7. Bb3‎ | 7...O-O‎ | 8. c3‎ | 8...d5‎ | 9. exd5‎ | 9...Nxd5‎ | 10. Nxe5‎ | 10...Nxe5‎ | 11. Rxe5‎ | 11...c6‎ | 12. d4
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Marshall Gambit
a b c d e f g h
8{{{square}}} black rook{{{square}}} black king{{{square}}} black bishop{{{square}}} black queen{{{square}}} black king{{{square}}} black rook{{{square}}} black king{{{square}}} black king8
7{{{square}}} black king{{{square}}} black king{{{square}}} black king{{{square}}} black king{{{square}}} black king{{{square}}} black pawn{{{square}}} black pawn{{{square}}} black pawn7
6{{{square}}} black pawn{{{square}}} black king{{{square}}} black pawn{{{square}}} black bishop{{{square}}} black king{{{square}}} black king{{{square}}} black king{{{square}}} black king6
5{{{square}}} black king{{{square}}} black pawn{{{square}}} black king{{{square}}} black knight{{{square}}} white rook{{{square}}} black king{{{square}}} black king{{{square}}} black king5
4{{{square}}} black king{{{square}}} black king{{{square}}} black king{{{square}}} white pawn{{{square}}} black king{{{square}}} black king{{{square}}} black king{{{square}}} black king4
3{{{square}}} black king{{{square}}} white bishop{{{square}}} white pawn{{{square}}} black king{{{square}}} black king{{{square}}} black king{{{square}}} black king{{{square}}} black king3
2{{{square}}} white pawn{{{square}}} white pawn{{{square}}} black king{{{square}}} black king{{{square}}} black king{{{square}}} white pawn{{{square}}} white pawn{{{square}}} white pawn2
1{{{square}}} white rook{{{square}}} white knight{{{square}}} white bishop{{{square}}} white queen{{{square}}} black king{{{square}}} black king{{{square}}} white king{{{square}}} black king1
a b c d e f g h

White has to move the rook from e5. The safest square for it is back on e1:

There's also the sideline

which seems to be motivated as much by novelty as anything else - the defence of f2 isn't generally an important factor, and the rook on e2 cuts the White queen's contact with h5 which gives Black the option of retreating her own queen there (from h3, after ...Qh4 g3 Qh3) in some lines.