518. Barasat

All India Trinamool Congress held the seat; the winning margin widened from 12.0% to 13.6%.

• Won on a lower shareIts own vote share fell 9.6% — it held because the rest of the vote was more divided.
• Vote fragmentedThe top two took only 69.1% between them, down from 89.9% — the field split more ways.

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