John Ayer wrote on Fri, Oct 24, 2014 01:19 PM EDT:
Murray on page 348 has a chart for the pieces, giving Spanish and English names, that clearly identifies the aanca with the gryphon, moving one step diagonally, then any number orthogonally (away from the point of origin, as Falkener makes clear). Betza failed to pay attention. He also departed from his source, and said so, in deciding that no orthogonal move is necessary.