Open Game

Definitions

1. A chess opening characterized by the moves 1.e4 e5, in which both White and Black move their king's pawn to the fourth rank with their first move.
   uncountable
2. Alternative letter-case form of Open Game.
   alt-of
3. Any of the set openings which begin in this way. (Ruy Lopez, Scotch Game, etc.)
   countable

Equivalents

CEFR level