Final position — White is winning
Queen's Indian Defence: Opening Trap (Friedman–Duncan)
White wins in 9 moves with a decisive material gain. (Friedman - Duncan, Dearborn 1992)
The moves
| 1. | d4 | Nf6 |
| 2. | c4 | e6 |
| 3. | Nf3 | b6 |
| 4. | Nc3 | Bb4 |
| 5. | Bg5 | Bb7 |
| 6. | e3 | h6 |
| 7. | Bh4 | d6 |
| 8. | Qa4+ | Nc6 |
| 9. | d5 |
How the Queen's Indian Defence: Opening Trap (Friedman–Duncan) works
The Queen's Indian Defence: Opening Trap (Friedman–Duncan) is a classic chess opening trap arising from the Queen's Indian defence. In this line White wins decisive material by move 9, punishing a natural-looking but losing idea from Black.
The full sequence runs 1.d4 Nf6 2.c4 e6 3.Nf3 b6 4.Nc3 Bb4 5.Bg5 Bb7 6.e3 h6 7.Bh4 d6 8.Qa4+ Nc6 9.d5. 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 (Friedman - Duncan, Dearborn 1992). Recognising it early lets you either spring it as White or sidestep it as Black.
Practice this trap move-by-move
Open the Queen's Indian Defence: Opening Trap (Friedman–Duncan) 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.