六壬神算

When something happens, the hexagram is the hexagram, if there is nothing to do, don't go to the hexagram.
Xiao Liuren, also known as Zhuge's magic calculation, meditates on the things you want to occupy in your mind, and then obtains the current month, day, time and other information to know the result.

You can also take the number at will when predicting. Count with your fingers, and you will know the result within a few seconds. Simple and straightforward yet magically effective.