Final position — Black is winning
Scandinavian Defence: Knight Fork
Black wins in 10 moves with a decisive material gain. (Wiesel - Weigel, 1923.??.??)
The moves
| 1. | e4 | d5 |
| 2. | exd5 | Qxd5 |
| 3. | Nc3 | Qa5 |
| 4. | Nf3 | Bg4 |
| 5. | h3 | Bxf3 |
| 6. | Qxf3 | Nc6 |
| 7. | Bb5 | Qb6 |
| 8. | Nd5 | Qa5 |
| 9. | b4 | Qxb5 |
| 10. | Nxc7+ |
How the Scandinavian Defence: Knight Fork works
The Scandinavian Defence: Knight Fork is a classic chess opening trap arising from the Scandinavian Defence. In this line Black wins decisive material by move 10, punishing a natural-looking but losing idea from White.
The full sequence runs 1.e4 d5 2.exd5 Qxd5 3.Nc3 Qa5 4.Nf3 Bg4 5.h3 Bxf3 6.Qxf3 Nc6 7.Bb5 Qb6 8.Nd5 Qa5 9.b4 Qxb5 10.Nxc7+. 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 (Wiesel - Weigel, 1923.??.??). Recognising it early lets you either spring it as Black or sidestep it as White.
Practice this trap move-by-move
Open the Scandinavian Defence: Knight Fork 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.