In his Chess Cafe column Gambit Cartel, Tim McGrew introduces the concept of the Caltrop Coefficient, basically the number of well-conceiled traps that a naive opponent playing natural moves might fall into when facing a given opening. The openings he mentions are the Damiano Defence 1.e4 e5 2.Nf3 f6, the Latvian Gambit, the Budapest Gambit 1.d4 Nf6 2.c4 e5, the Blumenfeld Gambit 1.d4 Nf6 2.c4 e6 3.Nf3 c5 4.d5 b5, the Blackburne-Hartlaub Gambit 1.d4 e5 2.de d6, the Felbecker Gambit 1.d4 e5 2.de Nc6 3.Nf3 Bc5 and the Soller Gambit 1.d4 e5 2.de Nc6 3.Nf3 f6. In a later article, he looks at the Schilling-Kostic Gambit 1.e4 e5 2.Nf3 Nc6 3.Bc4 Nd4 hoping for 4.Nxe5?! Qg5.
Can anyone name some other trappy openings? Are there any trappy openings that might hold up at correspondence speeds? Are there any players you know of who specialize in trappy openings? McGrew mentions Lev Zilbermintz, and probably players like Claude Bloodgood or Clyde Nakamura would qualify as well.