The term 'CHESSMEN' is used to refer to the three pieces in a game of chess: Bishops, Knights, and Pawns. Bishops are the most powerful piece on the board, able to move diagonally across the board in any direction. Knights are the only pieces that can jump over other pieces, and they move in an L-shape. Pawns are the weakest pieces, but they can be promoted to any other piece if they reach the opposite side of the board.