Vipareeta Raja Yoga needs to be checked in each chart

 6, 8,12 houses of  horoscope  are generally termed as bad, and if Planets are positioned in these houses then astrologers take special care to judge these planets. 6, 8 & 12 houses are  called                " Dusthana" ( Du = Bad  , sthana = place or 'bad place']

Vipareeta Raja Yoga [ Vipareeta = Opposite, Raja Yoga = "Kingly" Combination]  is formed when a planet ruling a  dusthana  [ 6, 8 or 12 houses] is placed in another dusthana house.

This yoga tends to bring benefit from otherwise unfavorably regarded houses as if two negatives are making a positive. This brings good results to native.