Chevvai Dosham — checked the Tamil way, and four others

What this tool computes

It reads Mars from your birth chart and applies the South Indian test for chevvai dosham — sevvai dosham in some spellings — then shows what four other documented traditions conclude from those same positions. Each verdict is printed with the houses that tradition treats as afflicted and the points it measures them from, so the reasoning is visible rather than summarised.

Why a Tamil verdict and a northern one often differ

The usual explanation offered is that the two use different house lists, and they do: the southern list counts the 2nd house, the northern list counts the 1st. But that difference is small. Measured across a large set of computed charts, swapping one house list for the other moves the flagged share by about 3 percentage points.

The larger difference is the reference point. Northern practice commonly judges Mars from the ascendant alone. Southern practice judges it from the Moon and from Venus as well, so a chart can be clean from the lagna and still be flagged. That single choice moves the flagged share by about 29 percentage points — roughly ten times as much as the house lists do.

What the result does and does not mean

The result tells you what each named tradition concludes about the position of one planet. It does not describe a person, and it does not describe a marriage. Across charts measured for this, 61.4% are flagged by one school and clean under another, which means a single verdict quoted on its own carries less information than it appears to.

There is a further point that matters specifically in Tamil and Kerala practice: chevvai dosham is not normally read as a standalone verdict there. It is weighed as part of papasamyam, the balance of malefic weight between the two charts, and alongside the ten poruthams. A yes or no on chevvai alone is a northern-shaped question asked of a southern rule.

Is chevvai dosham the same thing as manglik dosha?

It is the same planet and the same family of rules under a different name, read with a different house list and different reference points. Kuja dosha is the same again in Telugu and Kannada usage. Treating them as three separate afflictions is a common misreading of what is one tradition split three ways.

My jathagam was cleared in Tamil practice but flagged elsewhere. Which counts?

Both are faithful readings of their own rule, so the question to settle is whose rule your two families are actually using. Once the house list and the reference points are named, the disagreement usually stops being mysterious and becomes a specific, discussable difference.

Does chevvai dosham cancel if both charts have it?

Several traditions do state a condition of that kind, and others state it with qualifications about which houses or which reference point must match. The tool lists the conditions that apply to your chart with the text each is drawn from. It reports what is prescribed; it does not claim an outcome for it.