20. Quilandy

Indian National Congress held the seat; the winning margin narrowed from 6.2% to 2.1%.

• Won on a lower shareIts own vote share fell 6.7% — it held because the rest of the vote was more divided.
• New challengerICS (ICS) finished second with 42.9% — it did not contest here in 1980.
• Vote fragmentedThe top two took only 87.9% between them, down from 97.3% — the field split more ways.

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