In exemplification of the importance of castling, to escape from an attack, and to retort one on the adversary, see, presently, the diagram No. 8 (p. 24).
Check and Checkmate.—The King is said to be in check when he is attacked by any Piece or Pawn, for it being a fundamental law of chess that the King can never be taken, whenever any direct attack upon him is made, he must be warned of his danger by the cry of check, and the player is then compelled either to remove his King out of check, or parry the check by interposing a man between the King and the attacking Piece, or capture the checking man.
When he can do none of these three things, he is checkmated, and the game won by the other side. (See diagrams Nos. 9 and 10.) When the King is directly attacked by the Piece played, it is a simple check; but when the Piece moved does not itself give check, but unmasks another which does, it is called a discovered check. (See diagram No. 8.) The third species of check is named the double check, where the King is attacked both by the Piece moved and the one discovered. The fourth description is called perpetual check, a case which arises when a player has two or more squares on which he can give check, and his opponent can only parry one check by affording an opportunity for another. If the first player then persists in the repetition of these particular checks, the game must be abandoned as drawn. (See diagram No. 11).
Doubled Pawn.—When two Pawns of the same color are on the same file, the front one is called a doubled pawn.
Drawn Game.—When neither party can give checkmate, the game is drawn. This may arise from several causes, as:—1st. Perpetual check. 2d. Where there is not sufficient force to effect a mate, as a King and a Knight only, or a King and two Knights, &c., &c. 3d. Where one party has force sufficient, but is ignorant of the proper mode of applying it, and thus fails to checkmate his helpless adversary within the fifty moves prescribed by the "Code". 4th. Where both parties persist in repeating the same move from fear of each other. 5th. Where both parties are left with the same force at the end, as a Queen against a Queen, a Rook against a Rook, and the like, when, except in particular cases, the game should be resigned as a drawn battle. And 6th. When one of the Kings is stalemated.
En Prise.—When a Piece or Pawn is in a situation to be taken by the enemy, it is said to be en prise. To put a piece en prise, is to play it so that it may be captured.
The Exchange.—When a player gains a Rook for a Bishop or a Knight, it is termed winning the exchange.
False Move.—Any illegal move, such as castling when the King has been moved or is in check, moving a Rook diagonally, or a Bishop like a Knight, is called a false or an "impossible" move.
Fool's Mate.—This is the simplest of all checkmates, being accomplished in two moves in the following manner:—