Final position — White is winning
Blackmar-Diemer Gambit: Black Queen Trap
White wins in 11 moves with a decisive material gain. (Wall - Corrie, Thailand 1974)
The moves
| 1. | d4 | d5 |
| 2. | e4 | dxe4 |
| 3. | Nc3 | Nf6 |
| 4. | f3 | exf3 |
| 5. | Qxf3 | Qxd4 |
| 6. | Be3 | Qb4 |
| 7. | O-O-O | Bg4 |
| 8. | Nb5 | Na6 |
| 9. | Qxb7 | Rc8 |
| 10. | Nxc7+ | Nxc7 |
| 11. | Qxb4 |
How the Blackmar-Diemer Gambit: Black Queen Trap works
The Blackmar-Diemer Gambit: Black Queen Trap is a classic chess opening trap arising from the Blackmar-Diemer Gambit. In this line White wins decisive material by move 11, punishing a natural-looking but losing idea from Black.
The full sequence runs 1.d4 d5 2.e4 dxe4 3.Nc3 Nf6 4.f3 exf3 5.Qxf3 Qxd4 6.Be3 Qb4 7.O-O-O Bg4 8.Nb5 Na6 9.Qxb7 Rc8 10.Nxc7+ Nxc7 11.Qxb4. 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 (Wall - Corrie, Thailand 1974). Recognising it early lets you either spring it as White or sidestep it as Black.
Practice this trap move-by-move
Open the Blackmar-Diemer Gambit: Black Queen Trap 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.