16. Mainaguri

Indian National Congress held the seat; the winning margin widened from 12.2% to 18.3%.

• Won on a lower shareIts own vote share fell 9.4% — it held because the rest of the vote was more divided.
• New challengerIndependent (IND) finished second with 16.6% — it polled just 1.3% in 1969.
• Vote fragmentedThe top two took only 51.6% between them, down from 76.4% — the field split more ways.

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