Final position — Black is winning
Halosar Trap
Black wins in 12 moves with a decisive material gain.
The moves
| 1. | d4 | d5 |
| 2. | e4 | dxe4 |
| 3. | Nc3 | Nf6 |
| 4. | f3 | exf3 |
| 5. | Nxf3 | Bg4 |
| 6. | h3 | Bh5 |
| 7. | g4 | Bg6 |
| 8. | Ne5 | e6 |
| 9. | Qf3 | c6 |
| 10. | g5 | Nd5 |
| 11. | Bd3 | Nxc3 |
| 12. | Bxg6 |
How the Halosar Trap works
The Halosar Trap is a classic chess opening trap arising from the Queen's pawn game. In this line Black wins decisive material by move 12, punishing a natural-looking but losing idea from White.
The full sequence runs 1.d4 d5 2.e4 dxe4 3.Nc3 Nf6 4.f3 exf3 5.Nxf3 Bg4 6.h3 Bh5 7.g4 Bg6 8.Ne5 e6 9.Qf3 c6 10.g5 Nd5 11.Bd3 Nxc3 12.Bxg6. 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.
Recognising this pattern early lets you either spring it as Black or calmly sidestep it when you are White.
Practice this trap move-by-move
Open the Halosar 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.