Chess is a two-player game; each controls one colour throughout the game (Art. 1.1); Moves must be made with one hand only (Art. 4.1); Players record their moves in algebraic notation on the prescribed scoresheet, or an approved electronic equivalent (Art. 8.1.1.1)
Why people argue about this
People often assume that in chess, players can switch colors mid-game, which is incorrect according to Art. 1.1 of the FIDE rules. Actually, each player controls one color throughout the entire game from start to finish. This rule causes confusion because many newbies believe they have the freedom to choose their opponent's color at any point during the match.