The game of WesternChess
has six types of ChessPieces
As such, these are the only ChessPieces with which many people are familiar. However, ChessersPlayers may also recognize
as legitimate ChessPieces
There are many, many other kinds of ChessPieces. Wondrous many, in fact. See http://www.chessvariants.com/piececlopedia.dir/index.html for a slew of examples.