12. Motihari

Indian National Congress held the seat; the winning margin narrowed from 29.8% to 2.2%.

• Won on a lower shareIts own vote share fell 20.4% — it held because the rest of the vote was more divided.
• New challengerCommunist Party of India (CPI) finished second with 33.9% — it did not contest here in 1977.
• Vote fragmentedThe top two took only 69.9% between them, down from 83.1% — the field split more ways.

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