19. Chepauk-Thiruvallikeni

Dravida Munnetra Kazhagam held the seat; the winning margin narrowed from 50.5% to 5.1%.

• Won on a lower shareIts own vote share fell 23.1% — it held because the rest of the vote was more divided.
• New challengerTamilaga Vettri Kazhagam (TVK) finished second with 39.7% — it did not contest here in 2021.

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