Amid threats of Maoist violence, 18 of the 90 constituencies in Chhattisgarh will go to the polls on Monday to elect a new Assembly in the first phase of a battle in which the Congress is desperate to end 15 years of BJP rule.

The election, widely seen as a 'semi-final' ahead of the 2019 Lok Sabha polls, will also see a formidable third factor in an alliance stitched by Mayawati's BSP with the Chhattisgarh Janata Congress of former Chief Minister Ajit Jogi and the CPI.