The Anglo-Swiss GM Joe Gallagher pulled off the elegant trap given below against the Trompowsky Attack (1.d4 Nf6 2.Bg5). All of White's moves are very plausible. Best may have been the retrograde 5.Bc1!?, arguing that the queen doesn't really do much on b6, and intending to drive back Black's knight with f3 and e4. White played 7.Bxb8 because he was worried about 7.cxd4 Nc6 8.Nf3 Nb4. After 7...dxc3!, 8.Be5?? seemed to hold everything, but Gallagher's glorious 8...Rxa2!! annihilated White. On 9.Rxa2, 9...c2! would threaten both 10...cxb1(Q)# and 10...c1(Q)#.
Chessgames.com says that the game ended after 8...Rxa2!!, but Gallagher says that White unsportingly played on, even though it is difficult to hold his losses to "only" a rook and knight. This game is reminiscent of the famous Schlechter-Perlis game, except that in that game Black avoided the worst with 8...Nxc6!, leaving him just a pawn down.