Final position — Black is winning
Oh no my knight!
Black wins in 8 moves with a decisive material gain. (Lowens - Stafford, Postal 1950)
The moves
| 1. | e4 | e5 |
| 2. | Nf3 | Nf6 |
| 3. | Nxe5 | Nc6 |
| 4. | Nxc6 | dxc6 |
| 5. | e5 | Ne4 |
| 6. | d3 | Bc5 |
| 7. | dxe4 | Bxf2+ |
| 8. | Kxf2 | Qxd1 |
How the Oh no my knight! works
The Oh no my knight! is a classic chess opening trap arising from the Petrov's defence. In this line Black wins decisive material by move 8, punishing a natural-looking but losing idea from White.
The full sequence runs 1.e4 e5 2.Nf3 Nf6 3.Nxe5 Nc6 4.Nxc6 dxc6 5.e5 Ne4 6.d3 Bc5 7.dxe4 Bxf2+ 8.Kxf2 Qxd1. Each move looks reasonable, which is exactly why the trap is so effective over the board — White walks into it while trying to play "normal" developing moves.
This pattern is well known from master and correspondence play (Lowens - Stafford, Postal 1950). Recognising it early lets you either spring it as Black or sidestep it as White.
Practice this trap move-by-move
Open the Oh no my knight! 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.