We haven't
found anything in the web that answers your
question other than "white always moves first",
and that's the rule..., period.
However, in our very personal
opinion there are three reasons we can come up that may answer
your question.
1. If black pieces were to
move first, maybe then we would ask: "why black pieces move
first?"
2. By moving certain color
always first, we never have to guess who started a game. This is
very useful when reviewing annotated games and PGN files.
3. Although starting a game
gives a player a slight advantage, moving first becomes
irrelevant in tournament matches since every player has the
opportunity of playing an opponent with white and black pieces
alternatively.
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