Maha-yoga
Maha-yoga exists in 28 varieties. It is based on the exchange between the lords of the 1st, 2nd, 4th, 5th, 7th, 9th, 10th, and 11th houses. The yoga brings success to the matters of the houses involved in it.
Shri Govind Swarup Agarwal - "Vedic Astrology"