http://tw.youtube.com/watch?v=xJX2oklB_TA
this a short form belongs to "Lian Yi", " Lian Yi method" form is internal (YinYi) form while " YinYang Zhang" is external ( YangYi) form for application training.
we can see the movements in this form are for close fighting, take side postures even when move in, use palm, elbow,shoulder, hip,knee, feet and head, I suppose this is the so called " crab form" that Ma Gui good in because the side steps and the fighting methods.
there are some clips that I explain this form if you are interested, just key in 陰陽掌 to search on youtube.