521. Birbhum

Indian National Congress held the seat; the winning margin narrowed from 18.8% to 14.0%.

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 6.9% — it held because the rest of the vote was more divided.
• New challengerFBL (FBL) finished second with 22.3% — it did not contest here in 1962.
• Vote fragmentedThe top two took only 58.6% between them, down from 67.6% — the field split more ways.
• TurnoutTurnout rose 12.9% to 49.5%.

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