Final position — Black delivers mate
Bishop Mate (Aasum–Frenzel)
Black wins in 11 moves by checkmate. (Aasum - Frenzel, Germany 1989)
The moves
| 1. | Nc3 | d5 |
| 2. | e4 | dxe4 |
| 3. | Bc4 | Nf6 |
| 4. | f3 | Bf5 |
| 5. | g4 | Bg6 |
| 6. | g5 | exf3 |
| 7. | Qxf3 | Qd4 |
| 8. | Qxb7 | Ng4 |
| 9. | Qxa8 | Qf2+ |
| 10. | Kd1 | Ne3+ |
| 11. | dxe3 | Bxc2# |
How the Bishop Mate (Aasum–Frenzel) works
The Bishop Mate (Aasum–Frenzel) is a classic chess opening trap. In this line Black delivers checkmate on move 11, punishing a natural-looking but losing idea from White.
The full sequence runs 1.Nc3 d5 2.e4 dxe4 3.Bc4 Nf6 4.f3 Bf5 5.g4 Bg6 6.g5 exf3 7.Qxf3 Qd4 8.Qxb7 Ng4 9.Qxa8 Qf2+ 10.Kd1 Ne3+ 11.dxe3 Bxc2#. 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 (Aasum - Frenzel, Germany 1989). Recognising it early lets you either spring it as Black or sidestep it as White.
Practice this trap move-by-move
Open the Bishop Mate (Aasum–Frenzel) 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.