TECHNICAL TERMS IN USE AMONG CHESS-PLAYERS.

_Castling._--Although, as a general rule, the move of the King is
restricted to one square at a time, he has the privilege, under certain
conditions, once in the game, of moving in conjunction with either of
the Rooks two squares. This peculiar movement is called _Castling_, and
is performed in the following manner:--If a player wishes to castle on
his King's side of the board, he moves the King to K. Kt's sq., and then
places the K's Rook on K. B's square. If he castles on the Queen's side,
he plays his King to Q. B's sq, and Q's Rook to Q's sq. The object of
this compound move is to place the royal Piece in safety, and at the
same time bring the Rook from the corner square into better play.

The conditions under which a player is permitted to castle are:--1st.
The King must not be in check. 2d. The King must not have moved. 3d. The
Rook must not have moved. 4th. The King must not pass over or on to any
square attacked by an enemy's man. And 5th. There must be no Piece,
either of his own or the adversary's, between the King and the Rook.

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