The term 'MAKE CHESS MOVE' can be broken down into two crossword solutions: CASTLE (6 letters) and MATE (4 letters). In the game of chess, a CASTLE is a move that involves both the king and one of the rooks. The king moves two squares either horizontally or vertically, and then the rook moves to the square on the other side of the king. A MATE is a move that results in checkmate, which is when the king is in check and cannot escape. Checkmate is the end of the game, and the player who has checkmated their opponent wins.