The term 'STEP IN A CHESS GAME' can be solved by the four letter word 'MOVE'. In chess, a MOVE is a single action taken by a player to advance their pieces on the board. Each MOVE consists of a piece being moved from one square to another, and can involve capturing an opponent's piece. Moves are typically made in turns, with each player taking one turn at a time. Moves can also involve special actions such as castling or promoting a pawn.