Final position — Black is winning
Budapest Defence: Opening Trap (Hertneck–Wunderer)
Black wins in 10 moves with a decisive material gain. (Hertneck - Wunderer, Germany 1990)
The moves
| 1. | d4 | Nf6 |
| 2. | c4 | e5 |
| 3. | dxe5 | Ng4 |
| 4. | Bf4 | g5 |
| 5. | Bd2 | Nxe5 |
| 6. | e3 | d6 |
| 7. | Be2 | Be6 |
| 8. | Bc3 | Nbc6 |
| 9. | f4 | gxf4 |
| 10. | exf4 |
How the Budapest Defence: Opening Trap (Hertneck–Wunderer) works
The Budapest Defence: Opening Trap (Hertneck–Wunderer) is a classic chess opening trap arising from the Budapest 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.d4 Nf6 2.c4 e5 3.dxe5 Ng4 4.Bf4 g5 5.Bd2 Nxe5 6.e3 d6 7.Be2 Be6 8.Bc3 Nbc6 9.f4 gxf4 10.exf4. 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 (Hertneck - Wunderer, Germany 1990). Recognising it early lets you either spring it as Black or sidestep it as White.
Practice this trap move-by-move
Open the Budapest Defence: Opening Trap (Hertneck–Wunderer) 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.