370. Mathura

Indian National Congress held the seat; the winning margin narrowed from 18.8% to 5.7%.

• Won on a lower shareIts own vote share fell 13.1% — it held because the rest of the vote was more divided.
• New challengerJS (JS) finished second with 35.9% — it did not contest here in 1957.
• Vote fragmentedThe top two took only 77.5% between them, down from 90.5% — the field split more ways.

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