@Amit Bhat, pitru dosha are not curse yogas. As Ernst has detailed about Moon Rahu conjunction, which is one of the pitru dosha, it can be a great yoga for success once the initial adversity is overcome. It depends on the avasthas. Like Moon Rahu in cancer, this conjunction gives great results in Swarashi. Mahatma Gandhi, Raj Kapoor had this pitru dosha (Moon Rahu conjunction in cancer) and did quite well in their lives.
The other Pitru dosha includes Sun Ketu conjunction, Moon Ketu conjunction, Sun Rahu conjunction and even Sun-Saturn conjunctions which Ernst has explained in great details.
Some of these yogas are called Shakti Yogas and Lal Kitab even calls Moon Rahu conjunction as Dharmi Kundli, native is divine protected.
sorry for late reply. There is a concept called Dharmi Kundli in Lal Kitab where it especially mentions that natives with Moon Rahu conjunction (one of the pitri dosha) are divine protected as long as they stay Sattvik in nature. My personal experience. See, I have moon rahu exact, strong conjunction within 1 degree, in cancer sign in 11th house. So, being swarashi definitely helped me. It was a struggle in childhood and teenage years but now as Ernst mentions, that Moon Rahu conjunction can help Rahu mature early instead of the usual 42 years and afterwards maturation. That is what exactly happened. I am running 42 now. Now, Moon Rahu works well in my life. I see it as a positive conjunction and it helps me in research abilities, creative thinking. I read lot of psychology books around teenage as moon rahu in cancer but that time I was not in astrology and did it based on intuition. My health, career and relationships are normal. No traditional remedy was done.
Please let me know of any new insights, research findings, symptoms, remedies, etc. you find on Pitru Dosha as I clearly have a form of this.
I can send you my birth data if you still want to research and compare examples. If so, how do I send it to you?