20. Nellore

Indian National Congress held the seat; the winning margin narrowed from 21.4% to 4.3%.

Boundaries were redrawn between 1962 and 1967 — the comparison is matched by name and is indicative only.

• Won on a lower shareIts own vote share fell 16.2% — it held because the rest of the vote was more divided.
• Runner-up changedSecond place passed from Swatantra Party (SWA) to Independent (IND).
• Vote fragmentedThe top two took only 61.6% between them, down from 76.9% — the field split more ways.

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