The Wade Defence, a slightly offbeat but fully playable line, arises after 1...d6 2.Nf3 Bg4. Note that the plausible 2.c4 e5 3.dxe5?! dxe5 4.Qxd8+ Kxd8 scores less than 50% for White. The remaining semi-closed openings are uncommon. The Polish Defense has never been very popular but has been tried by Spassky, Ljubojević, and Csom, among others. The Queen's Knight Defense is an uncommon opening that often transposes to the Nimzowitsch Defence after 1.d4 Nc6 2.e4 or the Chigorin Defense after 2.c4 d5, although it can lead to unique lines, for example after 1.d4 Nc6 2.d5 or 2.c4 e5. The Englund Gambit is a rare and dubious sacrifice.