 On a circular board these advantages are negated, as a king's or queen's pawn only attacks one square, and its advance only opens one square for the bishop.Some players advance the central pawns first anyway, while others prefer to advance the rooks' pawns in order to open lines of attack for the more powerful pieces; it is not known which move, if any, is objectively best.The different geometry of the square and circular boards creates considerable differences in endgame theory