According to prevalent definition of Anfa Yoga in Vedic astrology; if in a horoscope, there is one or more than one planet in the house prior to the house of placement of Moon, Anfa Yoga is formed in the horoscope. This Yoga may bless the native with good results related to money, wealth, prosperity, spiritual growth, family and many other things.
The placement of Sun, Rahu and/or Ketu only, in the house prior to the house of placement of Moon is not considered for the formation of this Yoga. Hence one or more than one planet other than Sun, Rahu and Ketu should be placed in the house prior to the house of placement of Moon in a horoscope, for the formation of this Yoga in that horoscope.
In real practice, Anfa Yoga is not seen producing such results when only the aforementioned conditions are met. Hence more conditions should be met in order for this yoga to be formed effectively in a horoscope. If Moon is functionally benefic in one such horoscope, this yoga may produce better results. If the planet/planets placed in the prior house are also benefic; Anfa Yoga may produce even better results.
Taking an example, suppose Moon is placed in the third house of a horoscope in Aquarius and Venus is placed in the second house in Capricorn. Both Moon and Venus are malefic in the horoscope. In this case, Anfa Yoga may not be formed in the horoscope, though the primary conditions are met.
Taking another example, suppose exalted Moon is placed in the third house of a horoscope in Taurus and Mars is placed in the second house in Aries. In this case, Anfa Yoga may be formed in the horoscope, since both Moon and Mars are benefic. Hence the native with may witness good results related to profession, brothers, sisters, finances, wealth, family and a number of other things.
Once the formation of Anfa Yoga is confirmed in a horoscope, the next factor to check is its strength. The strength of this yoga is calculated through the placements of planets involved in its formation in various signs, nakshatras and navamshas; as well as through the influences of other benefic and malefic planets on them. The overall theme of horoscope and running times (Mahadashas) also affect the strength of this Yoga.
Taking an example, suppose benefic Moon is placed in the eleventh house of a horoscope in Taurus, in Taurus navamsha of Rohini nakshatra; and benefic Mars is placed in the tenth house in Aries, in Leo navamsha of Bharani nakshatra. Moon and Mars are strong in their respective signs as well as navamshas. Hence strong Anfa Yoga may be formed.
Let’s look at influences of malefic planets on this yoga. Suppose in the recently mentioned horoscope; malefic Mercury is placed in the eleventh house in Taurus with Moon; and malefic Rahu as well as Saturn is placed in the tenth house in Aries with Mars. Mercury may afflict Moon and Rahu as well as Saturn may afflict Mars. Hence the strength of Anfa Yoga may reduce significantly. Accordingly, the native may not benefit much from this yoga.
Looking at the running times; when Mahadashas (planetary periods) of malefic planets are in effect; benefic effects of Anfa Yoga may reduce. When Mahadashas of benefic planets other than the ones involved in the formation of this yoga are in effect; benefic effects of this yoga may increase. When Mahadashas of the planets involved in the formation of Anfa Yoga are in effect; the native may witness maximum benefits through this yoga. For instance; in the recent example, the native may benefit the most during Moon Mahadasha and Mars Mahadasha.