Petrov's Defence, Marshall Trap

The Marshall Trap is a chess opening in Petrov's Defence named after Frank Marshall.

The trap
'''1. e4 e5 2. Nf3 Nf6'''
 * The trap begins with Black playing Petrov's Defence.

'''3. Nxe5 d6 4. Nf3 Nxe4 5. d4 d5 6. Bd3 Bd6 7. 0-0 0-0 8. c4 Bg4 9. cxd5 f5 10. Re1?''' (see diagram)
 * White should play 10.Nc3 instead.

10... Bxh2+!
 * An unexpected blow.

11. Kxh2
 * If 11.Nxh2, then 11...Bxd1.

11...Nxf2
 * Black forks the white queen and bishop, forcing the queen to move.

'''12. Qe2 Nxd3 13. Qxd3 Bxf3 14. Qxf3 Qh4+'''
 * Followed by 15...Qxe1 winning the e1-rook. Black has a winning material advantage.