On the basic problems of the method of investing money in Zhouyi

Your description is wrong. The old yin in the money throwing method refers to the single yin, that is, three coins have both sides. At this time, it is called "old yin", and it is called moving. If it changes, it becomes Yang. Similarly, three coins are called Lao Yang. It should be noted that a hexagram must have three hexagrams. Change is just one of them.