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Marfitalu: The rule has been in effect for more then 500 years, does anyone claim to have played prior to that??
It was introduced at about the same time as the 2 square pawn move to combat the effect of evading the enemy pawn too easily. Other rules introduced at about the same time: Castling. Unlimited Queen and Bishop moves.
There aren't that many rules really, it shouldn't be hard to learn them!! I did when I was about 6.