Tenth lord in 10 th house is Maha yoga or Maha purusha yoga.It is not Raja yoga.
There must be connection between 9th and 10th lords to make it raja yoga.
Any combination of kendra and kona lords ,is raja yoga.
It requires some time to understand this simple principle.
9th lord in 9th house ,is also very good yoga,if that planet
is Guru or Sukra or full moon.
Kuja or Sani in 9th house,which is his own,is big yoga,but not a
Maha yoga. email@example.com
Please read my blog navagrahastro.blogspot.in wherein it is explained how the yogas can be evaluated empirically. Just having the presence of a planet or planets in related houses alone will not make it a yoga. A Yoga can be from 0% to 100% powerful and the results will obviously vary with the percentages. There are beggars who are having Rajayoga and Gajakesari Yoga and Mahapurusha yoga, obviously having poor percentage strengths.