The knight move is unusual among chess pieces. When it moves, it can move two squares horizontally and one square vertically, or two squares vertically and one square horizontally. The complete move therefore looks like the letter 'L'. Unlike all other standard chess pieces, the knight can 'jump over' all other pawns and pieces (of either colour) to its destination square. It captures an enemy piece by moving into its square. The move is one of the longest surviving moves in chess, having remained unchanged since before the seventh century AD. Because of this it also appears in most chess-related national games. The knight moves alternately to white and black squares.