To use Vimshottari mahadasha only for predictions, as many astrologers do, is a case of astrological poverty, technical deficiency and an avoidable defect. Maharishi Parashara and Jaimini have given so many dashas which should be used along with Vimshottari dasha to make predictive techniques meaningful and effective. In any medical diagnosis there are multipronged approach. In Hindu astrology such approach has existed for thousands of years. It has to be revived. Here is a comprehensive research on one of the special nakshatra dashas of Maharishi Parashara done with the sole aim of equipping astrologers of future generation with a very effective technique of cross-checking an event through a special dasha applicable to those horoscopes where: i. Lagna lord is in the seventh house, or, ii. Seventh lord is in Lagna, or, iii. Lagna lord is in the seventh house and the seventh lord is in the lagna. It is easy to understand and very simple in application. The illustrative charts given here make the book brilliantly clear in understanding how the Dwisaptati Sama Dasha works, is to be applied. It is a very original research and will become a model for further and continuing researches in other conditional dashas of Maharishi Parashara.