When we come to the lesson on learning to quantify the strength of a Graha (Graha Bala), we will come to the term called Chestta Bala. A Vakri Graha is said to possess high Chestta Bala. The word Chestta means the great strength of perseverance. Hence we may deduce that a vakri Graha gives the strength to keep on trying till success is attained.
Pundit Sanjay Rath always liked to remind us of the story of king Bruce and the spider whenever retrogression was discussed. Many may be aware of the story, if not, there always google.
Now this also gives us a hint that a retrograde Graha will give its effect very late and only after a great amount of trails and tribulations.

RishiRahul and vivek.

A Vakri graha also shows that the initial effect promised by the Graha may be reversed. Suppose the Graha promises great good things as read by the normal rules, but because it is Vakri it will give the reverse effect.
One of the best Horoscope to see and remember the effect of a Vakri graha is Shri Raama's Kundali. In this Kundali shani is Vakri.
Shani is exalted in the fourth bhaava and vakri in Shri Raama's horoscope.

RishiRahul and vivek.

A Dictum applicable to vakri Grahas.
"If a natural benefic is retrograde & debilitated in a Kendra or Trikona, it indicates a curse from a past life.... Natural malefic planets in a Kendra or Trikona when retrograde and debilitated are a blessing from past birth. The opposite occurs in a dusthana."

RishiRahul and vivek.

In Lord Raama's chart, Shani is exalted and vakri in a Kendra and has caused much turmoil in his life.

RishiRahul and vivek.

To analyse a Vakri Graha we take a two step approach.
First step is the Kaarakatwa of the Vakri Graha.
Take for example Guru. If Guru is vakri in achart then also analyse the Bhaavas foe which Guru is a significator (Kaaraka). You have to see the first (Dhi), Second (money), Fifth (children), ninth (bhaagya) and eleventh (income). Analyse the Lord as well as the bhaava. If any of them is afflicted then that area shows a problem zone.
Second step. See the bhaavas owned by the Vakri Graha and then analyse the Placement of the Kaarakas of these Bhaavas. If both the kaarakas and the lordship have a problem you can pinpoint the area/s of life of the native affected.
For example if in a chart having guru vakri and it owns the fourth and seventh Bhaavas. the kaaraka/s for fourth are Chandra and also Shukra. If these are not well placed then you may zero in on the fourth bhaava indication to suffer.

Rishirahul and vivek.