Kings in Chess are different than kings in feudalism because in feudalism, the king has ultimate power, even though he may sometimes be poor because he gave out too many fiefs to the knights in exchange for protection. However, in chess, the king has almost no power at all; he can only move one space at a time unless the rook is Castling it. (Castling is when one rook has not moved any spaces at all yet, so the king is allowed one extra square to move.) It's also different because the Rook (or Castle) did not really 'attack' people, it just helped defend the king and serfs. (serfs are people almost like slaves, but they own a house and work on a fief for a knight. Their land can never be taken away from them.)
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The main difference between chess and other Board Games is that chess is almost totally a game of mental ability. There is no luck or physical prowess required as in almost all other board games.