Dear Master

Are hidden combinations always bad for the female? What are the implications When the day pillar is the same as the tai yuan, meaning "fuyin"?  Thanks

There is no sure bad or sure good in BaZi. You have to see the combination itself.

Day pillar Fu Yin with Ta Yun also have many implications. For example if Day pillar having "Self Punishment" (for Dragon sitting at your day branch) with your day branch aka spouse palace it will affect your relationship with your partner. If it involves only you hostiles Ten Gods it can be very bad but you have to look at the whole situation. "Fu Yin" can also be good.

Cheers.