51. Kollengode

Communist Party of India (Marxist) held the seat; the winning margin narrowed from 6.6% to 4.4%.

• Won on a lower shareIts own vote share fell 3.6% — it held because the rest of the vote was more divided.
• New challengerIndian National Congress (INC) finished second with 44.7% — it did not contest here in 1982.
• Vote fragmentedThe top two took only 93.7% between them, down from 98.8% — the field split more ways.

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