What this rule checks
Source: C. S. Patel, Predicting through Navamsa & Nadi Astrology, chapter 22, printed pages 185–187 (PDF pages 99–100). In the D1 Samudaya/Sarvashtakavarga table, houses 7, 9 and 12 must form the lowest-scoring set of three, in any order. This strict-separation version checks all 27 pairwise comparisons against the other nine houses. Ties within the target group are allowed. A tie with an outside house is excluded by this version; the source does not settle that boundary case. No fixed score or average threshold is used. Use complete D1 SAV data. The chapter gives nine examples and asks for further research.