519. Basirhat

All India Trinamool Congress held the seat; the winning margin widened from 5.8% to 8.6%.

• Won on a lower shareIts own vote share fell 7.5% — it held because the rest of the vote was more divided.
• Vote fragmentedThe top two took only 68.7% between them, down from 86.6% — the field split more ways.

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