12. Mainaguri

Indian National Congress held the seat; the winning margin narrowed from 18.5% to 12.0%.

• Won on a lower shareIts own vote share fell 14.2% — it held because the rest of the vote was more divided.
• Vote fragmentedThe top two took only 63.4% between them, down from 85.2% — the field split more ways.

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