251. Mariahu

Indian National Congress held the seat; the winning margin widened from 4.5% to 5.1%.

• Won on a lower shareIts own vote share fell 10.3% — it held because the rest of the vote was more divided.
• New challengerJNPSC (JNPSC) finished second with 33.7% — it did not contest here in 1977.
• Vote fragmentedThe top two took only 72.6% between them, down from 93.7% — the field split more ways.

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