"A spectator might ask, in one sense of 'why', why the bishop always ends a move on a square of the same colour as that on which it began the game; he would be answered by being referred to the rules of chess, including those prescribing the design of the board. He might then ask, in another sense of 'why', why a player at a certain stage of the game moved one of his bishops (and not some other piece) to one square (and not to another); he might be answered that it was to force the opposing Queen to cease to threaten the player's King".
(G. R.)
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