Hi Willy,
this is an eye opener. I have seen terms of 六爻 and 大六壬 but not sure what they were. Thanks for this introduction, but with the eyes open, there are more questions.

I have seen someone using QMDJ to do a life analysis similar to using 4P. What is the strength of QMDJ over 4P?
Hope more experts can comment.
Btw, I fully agreed your comment on "... with 4p, one element can mean a lot of things", this make analysis difficult.