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...Bd6/13. Re1/13...Qh4/14. g3/14...Qh3/15. Re4

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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 | 12...Bd6‎ | 13. Re1‎ | 13...Qh4‎ | 14. g3‎ | 14...Qh3
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Marshall Gambit
a b c d e f g h
8a8 black rookb8 black kingc8 black bishopd8 black kinge8 black kingf8 black rookg8 black kingh8 black king8
7a7 black kingb7 black kingc7 black kingd7 black kinge7 black kingf7 black pawng7 black pawnh7 black pawn7
6a6 black pawnb6 black kingc6 black pawnd6 black bishope6 black kingf6 black kingg6 black kingh6 black king6
5a5 black kingb5 black pawnc5 black kingd5 black knighte5 black kingf5 black kingg5 black kingh5 black king5
4a4 black kingb4 black kingc4 black kingd4 white pawne4 white rookf4 black kingg4 black kingh4 black king4
3a3 black kingb3 white bishopc3 white pawnd3 black kinge3 black kingf3 black kingg3 white pawnh3 black queen3
2a2 white pawnb2 white pawnc2 black kingd2 black kinge2 black kingf2 white pawng2 black kingh2 white pawn2
1a1 white rookb1 white knightc1 white bishopd1 white queene1 black kingf1 black kingg1 white kingh1 black king1
a b c d e f g h
Common moves:
15...g5 - only move

The surprising 15...g5! is the only move. Black prevents Rh4 by direct means. White can't simply reply with Bxg5 because ...Qf5 would fork the two loose White pieces.