119. Thondamuthur

All India Anna Dravida Munnetra Kazhagam held the seat; the winning margin narrowed from 18.1% to 5.7%.

• Won on a lower shareIts own vote share fell 17.8% — it held because the rest of the vote was more divided.
• New challengerTamilaga Vettri Kazhagam (TVK) finished second with 30.4% — it did not contest here in 2021.
• Vote fragmentedThe top two took only 66.5% between them, down from 89.7% — the field split more ways.

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