Wikipedia:WikiProject Chess - Capitalization Conventions

Capitalization Conventions

• The names of pieces (king, queen, rook, etc.) are not capitalized (except when the first word of a sentence).
• The words "white" and "black" are capitalized only when they are used as substitutes for player names, e.g. "... captured White's rook ... " and "the black queen...".
• Following our sources, chess opening names are capitalized as proper nouns, e.g., "King's Gambit", "Nimzo-Indian Defence", and "Dragon Variation".
• In quotations, the capitalization used in the source is followed, even if different from the above conventions.