Semi-Open Game

A Semi-Open Game (or Semi-Open Opening) is a chess opening in which White plays 1.e4 and Black breaks symmetry immediately by replying with a move other than 1...e5. The Semi-Open Games are also called Single King Pawn, Asymmetrical King Pawn, or Half-Open Games. They are the complement of the Open Games or Double King Pawn Games, which begin 1.e4 e5.

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