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72 player has determined whether it is to his advantage to castle; and if his decision is in the affirmative, he must decide whether he will castle with the King's Rook or with the Queen's Rook, before either has been moved.

The Bishop. The Bishop and the Knight are of about equal value, though in the middle game, the latter has the advantage. In the end game, however, the Knight is at a disadvantage if there are no other Pieces to support him, because of the character of his move. In this case, two Bishops can accomplish more than two Knights or a Knight and a Bishop. Bishops are particularly strong when commanding long diagonals and should be developed early in the game.

The Knight. This Piece is equal in value to three Pawns and is the best Piece with which to begin an attack, as his move is not hampered by intervening forces, or a crowded board. Two Knights co-operate most successfully when not protecting each other. To avoid attack from a Knight,