45. Kilvaithinankuppam

All India Anna Dravida Munnetra Kazhagam held the seat; the winning margin narrowed from 6.9% to 5.9%.

• Won on a lower shareIts own vote share fell 5.4% — it held because the rest of the vote was more divided.
• Vote fragmentedThe top two took only 85.6% between them, down from 95.3% — the field split more ways.

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