Chessman is a term used to describe the pieces used in the game of chess. The ROOK is a four-letter PIECE that is typically represented by a castle-like structure and is used to move horizontally or vertically across the board. The PIECE is a five-letter PIECE that can move diagonally across the board and is often represented by a horse-like figure. Finally, the PAWN is a four-letter PIECE that is typically represented by a small figure and is used to move forward one space at a time.