Pieces on a board is a term used to describe the pieces used in a board game. The three letter answer for this crossword is MEN, which refers to the pieces used in a game of chess. Chess is a two-player strategy board game that has been around since the 6th century and is still popular today. The pieces on a chess board are divided into two sets, one for each player, and consist of 16 pieces: 8 pawns, 2 rooks, 2 knights, 2 bishops, 1 queen, and 1 king.