18. Mudaliarpet

All India Anna Dravida Munnetra Kazhagam held the seat; the winning margin narrowed from 38.4% to 18.7%.

• Won on a lower shareIts own vote share fell 17.4% — it held because the rest of the vote was more divided.
• New challengerAINRC (AINRC) finished second with 31.1% — it did not contest here in 2011.
• Vote fragmentedThe top two took only 80.8% between them, down from 95.9% — the field split more ways.

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