5. Humnabad

Communist Party of India held the seat; the winning margin narrowed from 4.4% to 1.0%.

• Won on a lower shareIts own vote share fell 12.0% — it held because the rest of the vote was more divided.
• New challengerNCO (NCO) finished second with 32.9% — it did not contest here in 1967.
• Vote fragmentedThe top two took only 66.9% between them, down from 87.5% — the field split more ways.

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