Final position — White delivers mate
King's Gambit: Back-Rank Mate (Sanders–Unknown)
White wins in 10 moves by checkmate. (Sanders - Unknown, NY 1910)
The moves
| 1. | e4 | e5 |
| 2. | f4 | d5 |
| 3. | Nc3 | dxe4 |
| 4. | Nxe4 | exf4 |
| 5. | Bc4 | Qh4+ |
| 6. | g3 | fxg3 |
| 7. | Qe2 | g2+ |
| 8. | Kd1 | gxh1=Q |
| 9. | Nf6+ | Kd8 |
| 10. | Qe8# |
How the King's Gambit: Back-Rank Mate (Sanders–Unknown) works
The King's Gambit: Back-Rank Mate (Sanders–Unknown) is a classic chess opening trap arising from the King's gambit. In this line White delivers checkmate on move 10, punishing a natural-looking but losing idea from Black.
The full sequence runs 1.e4 e5 2.f4 d5 3.Nc3 dxe4 4.Nxe4 exf4 5.Bc4 Qh4+ 6.g3 fxg3 7.Qe2 g2+ 8.Kd1 gxh1=Q 9.Nf6+ Kd8 10.Qe8#. Each move looks reasonable, which is exactly why the trap is so effective over the board — Black walks into it while trying to play "normal" developing moves.
This pattern is well known from master and correspondence play (Sanders - Unknown, NY 1910). Recognising it early lets you either spring it as White or sidestep it as Black.
Practice this trap move-by-move
Open the King's Gambit: Back-Rank Mate (Sanders–Unknown) in the Trapsterapp to play it out on a live board, drill it in practice mode, and learn how to avoid it when it's set for you — along with the full library of chess traps and gambits, fully offline.