Final position — Black is winning
Sacrifice the Knight on f7
Black wins in 8 moves with a decisive material gain. (50 Opening Traps,Part 1 - Sacrifice the Knight on f7 - A40 - https://lichess.org/@/CHESSLUCAFD)
The moves
| 1. | d4 | e6 |
| 2. | Nf3 | f5 |
| 3. | g3 | b6 |
| 4. | d5 | Be7 |
| 5. | Bg2 | Bb7 |
| 6. | Ne5 | d6 |
| 7. | Nf7 | Kxf7 |
| 8. | dxe6+ |
How the Sacrifice the Knight on f7 works
The Sacrifice the Knight on f7 is a classic chess opening trap arising from the Queen's pawn. In this line Black wins decisive material by move 8, punishing a natural-looking but losing idea from White.
The full sequence runs 1.d4 e6 2.Nf3 f5 3.g3 b6 4.d5 Be7 5.Bg2 Bb7 6.Ne5 d6 7.Nf7 Kxf7 8.dxe6+. 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 (50 Opening Traps,Part 1 - Sacrifice the Knight on f7 - A40 - https://lichess.org/@/CHESSLUCAFD). Recognising it early lets you either spring it as Black or sidestep it as White.
Practice this trap move-by-move
Open the Sacrifice the Knight on f7 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.