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A type of chess opening, in which White plays 1.e4 (moves their king's pawn to the fourth rank with their first move) and Black breaks symmetry by replying with a move other than 1...e5.
Definition source: English Wiktionary via Wiktextract
No example sentence was provided for this meaning.
Meaning relationships
Synonyms: none provided
Antonyms: none provided
Alternative letter-case form of Semi-Open Game.
Definition source: English Wiktionary via Wiktextract
Usage: alt-of
No example sentence was provided for this meaning.
Meaning relationships
Synonyms: none provided
Antonyms: none provided
No etymology was provided for this word.