"Check," and if the King cannot by some means escape from the attack, the game is at an end.
1. The King.
The King, as the name denotes, is the most important piece on the board, inasmuch as the object of the game is to capture the King. It is, however, never actually "taken," the game ending whenever (the opposing player having the move) the King
remains liable to capture. The King may move from any square upon which it stands to any adjoining square not occupied by any piece or pawn of its own colour. If one of such adjoining squares is occupied by an undefended piece or pawn of the opposite colour, it may take such piece or pawn.
An additional privilege of the King ("castling") will be explained in its proper place.
2. The Rook.
The Rook (or Castle) moves upon straight lines only, in a horizontal or vertical direction, to any square not occupied by any piece or pawn of its own colour. If the line on which it operates terminates in a piece or pawn of the opposite colour, it can take such piece or pawn.
3. The Bishop.
The Bishops move and take upon diagonals only: the King's Bishop upon the diagonals of its own colour, the Queen's Bishop on those of the opposite colour; stopping short, however, when it reaches a square occupied by any piece or pawn of its own colour.