King's Pawn Game
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The term King's Pawn Game refers to any chess opening where White opens with 1.e4, the most popular of the twenty possible opening moves. Since nearly all of these openings have names of their own, the term "King's Pawn Game", unlike Queen's Pawn Game is rarely used to describe the opening of the game.
King's Pawn Games are further classified by whether Black responds with 1...e5 or not. Openings beginning with 1.e4 e5 are called Double King's Pawn Games (or Openings), Symmetrical King's Pawn Games (or Openings), or Open Games—these terms are equivalent. Openings where Black responds to 1.e4 with a move other than 1...e5 are called Asymmetrical King's Pawn Games (or Openings) or Semi-open Games.
The Encyclopedia of Chess Openings classify all King's Pawn Games into volumes B or C. Volume C is used if the game starts with 1.e4 e6 (the French Defence) or 1.e4 e5. Volume B is used if Black answers 1.e4 with any other move. The rare instances where the opening does not fall into a more specific category than "King's Pawn Game" are included in codes C20 and B00.
See also
- Chess opening#Open games (1.e4 e5) and
- Chess opening#Semi-open games (1.e4, Black plays something other than 1...e5) have lists of openings starting with 1.e4.