The term ONE OF EIGHT ON A CHESSBOARD can be broken down into two crossword solutions: ROW (3 letters) and RANK (4 letters). In the game of chess, each player has eight pieces on a board made up of 64 squares. The pieces are arranged in two rows, one for each player. Each ROW is further divided into ranks, which are the horizontal lines of squares. Therefore, the term ONE OF EIGHT ON A CHESSBOARD refers to one of the eight pieces on the chessboard, which is located in a specific ROW and RANK.