Uncommon Openings
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.
Read more about this topic: Semi-Closed Game
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