Final position — White is winning
King's Pawn Opening: Wins a Piece (Wall–Ross)
White wins in 12 moves with a decisive material gain. (Wall - Ross, North Carolina 1980)
The moves
| 1. | e4 | a6 |
| 2. | d4 | b5 |
| 3. | Nf3 | Bb7 |
| 4. | Bd3 | c5 |
| 5. | dxc5 | e6 |
| 6. | O-O | Bxc5 |
| 7. | c4 | b4 |
| 8. | Bg5 | f6 |
| 9. | Be3 | Qc7 |
| 10. | Nh4 | Ne7 |
| 11. | Qh5+ | g6 |
| 12. | Qxc5 |
How the King's Pawn Opening: Wins a Piece (Wall–Ross) works
The King's Pawn Opening: Wins a Piece (Wall–Ross) is a classic chess opening trap arising from the King's pawn opening. In this line White wins decisive material by move 12, punishing a natural-looking but losing idea from Black.
The full sequence runs 1.e4 a6 2.d4 b5 3.Nf3 Bb7 4.Bd3 c5 5.dxc5 e6 6.O-O Bxc5 7.c4 b4 8.Bg5 f6 9.Be3 Qc7 10.Nh4 Ne7 11.Qh5+ g6 12.Qxc5. 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 - Ross, North Carolina 1980). Recognising it early lets you either spring it as White or sidestep it as Black.
Practice this trap move-by-move
Open the King's Pawn Opening: Wins a Piece (Wall–Ross) 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.