Quasimodo Trap

The Trap in this game was used to counter an Evan's Gambit which is characterized by the sacrificial move ....b4.  An example of Evan's Gambit may be found in Brilliant Chess Games.

1. e4, c5
2. b4, cxb4
3. d4, e5
4. dxe5, Nc6
5. Nf3, Nge7
6. Bf4, Ng6
7. Bg3, Qa5
8. Qd5, b3!
9. Qxa5, b2!!

Black intends to capture the a1 Rook and promote the pawn to Queen.

10. Qc3 ....

The only way to save the Queen and prevent the pawn from being promoted.

10. .... Bb4
11. Qxb4??  ....

A very bad move.  White's better alternative is 11. N1d2 and after 11.....Bxc3 12. Rb1, White would be fine.

11. .... Nxb4

White resigns.  The b2 Pawn will capture the Rook and will be promoted to Queen.