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Rh They are generally recognized as those in which the first move of each player is some other than P—K4, or P—Q4. Staunton, however, classifies them as those of attack, in which the first player's first move is either P—KB4 or P—QB4 and those of defence in which the second player, in answering the first player's first move, P—K4 or P—Q4, moves his P—K3, P—QB4, P—KB4, or P—Qkt3.