These Dasas have conditions for their applicability. So they are only applicable to specific charts.
Some of the conditions are quite restrictive, so the condition for Panchottari Dasa: Lagna and Dvadasamsa Lagna must be in Cancer, this condition matches only for 1/144 of the charts. Other conditions are not so restrictive.
The conditional Dasas are exposed in Parasara Hora Shastra.
|Name of Dasa||Conditions|
|Ashtottari||Rahu is not in Ascendant, Kendra or Trikona|
|Shodshottari||Ascendant in Hora of the Moon in dark half of the month, or Ascendant in Hora of the Sun in the bright half of the month|
|Dvadashottari||Ascendant is in the Navamsa of Venus. Or: Ascendant is in the Navamsa sign of Venus (Shukramsa).|
|Panchottari||Ascendant in Rasi and Dvadasamsa (D12) in Cancer|
|Shatabdika||Ascendant is Vargottama, i.e. Rasi and Navamsa Ascendant occupy the same sign.|
|Chaturashiti Sama||Lord of 10 in 10|
|Dvisaptati Sama||Lord of Ascendant in 1 or 7|
|Shat Trimshat Sama||Ascendant in Hora of the Sun for birth during the day, or Ascendant in Hora of Moon for night birth|