207. Sivakasi

All India Anna Dravida Munnetra Kazhagam held the seat; the winning margin narrowed from 29.7% to 10.0%.

• Won on a lower shareIts own vote share fell 22.6% — it held because the rest of the vote was more divided.
• New challengerIndependent (IND) finished second with 28.7% — it polled just 0.6% in 1980.
• Vote fragmentedThe top two took only 67.4% between them, down from 92.9% — the field split more ways.

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