Unlike its counterpart SanHe, SanYuan leaning star means Yang - Lean Forward and Yin - Lean Backward. Leaning forward also means that the star in this case LoShu take the forward flight path and Leaning backward means the LoShu take a reverse flight path. This is how the SanYuan school intepreted the use of YinYang of the 24 mountain "Human" Plate of the SanYuan LuoPan. Therefore, they are also termed, Yin YangYang and Yang YinYin in arithmetical connotation such as +--, -++. Such is also magnified by Jiang DaHung when he commented in DiLi BianZhen as the followings: -
One question, is this a TRUE SANYUAN?