Final position — White is winning
Black Queen Trap (Wall–Kubasek)
White wins in 8 moves with a decisive material gain. (Wall - Kubasek, Thailand 1973)
The moves
| 1. | g4 | d5 |
| 2. | Bg2 | Bxg4 |
| 3. | c4 | c6 |
| 4. | cxd5 | Nf6 |
| 5. | Qb3 | Qb6 |
| 6. | dxc6 | Qxb3 |
| 7. | cxb7 | Qxb7 |
| 8. | Bxb7 |
How the Black Queen Trap (Wall–Kubasek) works
The Black Queen Trap (Wall–Kubasek) is a classic chess opening trap. In this line White wins decisive material by move 8, punishing a natural-looking but losing idea from Black.
The full sequence runs 1.g4 d5 2.Bg2 Bxg4 3.c4 c6 4.cxd5 Nf6 5.Qb3 Qb6 6.dxc6 Qxb3 7.cxb7 Qxb7 8.Bxb7. 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 - Kubasek, Thailand 1973). Recognising it early lets you either spring it as White or sidestep it as Black.
Practice this trap move-by-move
Open the Black Queen Trap (Wall–Kubasek) 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.