The above position represents the appearance of the forces on each side
towards the end of a game, and will assist to explain the application of
two or three of the technical terms described in the present section, as
well as to exhibit the King in a situation of checkmate. You already
understand that the moves at chess are played by each party
alternately; in this case it is White's turn to play, and he will
checkmate his antagonist in two moves. Place the chess-men on your board
exactly in the order they stand in the diagram; having done this,
suppose yourself to be playing the White men, and take the Black King's
Pawn with your Queen, in the manner before shown, _i.e._, by taking the
Pawn from the board and stationing your Queen on the square it occupied.
By this act, you not only take his Pawn, but you attack his King, and
must apprise him of his danger by calling "_check_." He has now two ways
only of parrying this check. It is clear he cannot move his King,
because the only two squares to which he could move without going into
check are occupied by his own men; he is forced then either to take the
Queen with his K. B's Pawn, or to interpose the Bishop at King's second
square. If he take the Queen with his K. B's Pawn, you must reply by
playing your King's Bishop (which you will know by the color of the
diagonal on which he travels) to K. Kt's sixth square, crying "check."
Examine the position attentively, and you will find that Black has no
square to which he can move his King, the only vacant one being attacked
by your Queen's Bishop, that he has nothing wherewith to take the Bishop
that has given check, and neither Piece nor Pawn with which to interpose
between it and his King, and that consequently, he is not only checked,
but _checkmated_. In like manner, if, at his first move, instead of
capturing your Queen, he interpose his Bishop at King's second square,
you immediately take the Bishop with your Queen, who is protected by her
Bishop, and say "checkmate."[A]