21. Tirupathi

Indian National Congress held the seat; the winning margin narrowed from 50.2% to 9.1%.

Boundaries were redrawn between 1971 and 1977 — the comparison is matched by name and is indicative only.

• Won on a lower shareIts own vote share fell 20.5% — it held because the rest of the vote was more divided.
• New challengerBLD (BLD) finished second with 45.4% — it did not contest here in 1971.
• TurnoutTurnout rose 9.9% to 63.3%.

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