180. Peravurani

All India Anna Dravida Munnetra Kazhagam held the seat; the winning margin widened from 17.1% to 28.7%.

• Won on a lower shareIts own vote share fell 3.1% — it held because the rest of the vote was more divided.
• New challengerCommunist Party of India (CPI) finished second with 26.8% — it did not contest here in 1980.
• Vote fragmentedThe top two took only 82.2% between them, down from 100.0% — the field split more ways.

Written from the constituency figures by a fixed set of rules — no language model.