portugal: Different colors to go along with the different lengths would help differentiate them, too. For example, if the short lines were blue and the long ones red.

jurek:

"short lines were blue and the long ones red", can you tell me what you mean by that? Lines seem to be the same length, it's just a matter of showing and arrow "->" for multiple squares (rook, bishop move) compared to just a "-" for one square (king, pawn, silver, gold). That already seems to be solved from the wiki page which has a circle instead of a line for single squared moves.

jadarite: from AbigailII: "One way to show the Eagle: arrows up-left, up-right, down. short lines up, right, left. longer lines down-left and down-right."