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The Election Commission of India (ECI) has set the stage for a fiercely contested 2026 West Bengal Assembly election. Hours after announcing a two-phase poll schedule, the ECI executed a sweeping administrative overhaul that effectively decapitated the state’s top bureaucratic and police leadership.

In a late-night and early-morning round of orders, the ECI removed Chief Secretary Nandini Chakravorty, Home Secretary Jagdish Prasad Meena, Director General of Police Peeyush Pandey and Kolkata Police Commissioner Supratim Sarkar. All four were replaced with immediate effect, triggering a sharp political reaction from the ruling Trinamool Congress (TMC), which accused the commission of overreach. TMC Rajya Sabha leader Derek O’Brien said the ECI was misusing its administrative authority and the party staged a walkout in parliament in protest.

But beyond the political confrontation over the transfers, the structure of the poll schedule and recent electoral roll revision data point to a deeper pattern. A constituency-level reading of past results, voter deletions and adjudication trends suggests that the two phases divide the state into sharply different electoral terrains and that the nature of roll revision activity differs significantly across them.

The big picture: two distinct geographies

The two-phase schedule splits West Bengal into two distinct political and demographic zones. Phase 1, which covers 152 seats, represents the more competitive and volatile battleground. Based on 2024 Lok Sabha segment mapping, the average winning margin in these seats was 9.89%. The TMC’s strike rate in this zone fell from 60.5% in the 2021 Assembly election to 52.6% in 2024. The BJP held steady at 39.5%, while the Congress-Left alliance established a foothold with a 7.9% strike rate.

Phase 2, covering 142 seats, is historically more favourable to the incumbent. The average winning margin here in 2024 was 15.05%, significantly higher than in Phase 1. The TMC remained dominant in this zone, winning 80.3% of seats in 2024, down only modestly from 86.6% in 2021. The BJP improved its presence from 12.7% to 19.7%, but the region remained the core of the TMC’s electoral strength.

This political divide is mirrored in the roll revision data. In broad terms, Phase 1 is marked by high levels of pending adjudication, while Phase 2 shows more substantial levels of outright voter deletion.

Phase 1: the under-adjudication zone

Phase 1 includes 152 seats across 16 of West Bengal’s 23 districts, spanning much of North and Central Bengal and coastal Purba Medinipur. This region includes clusters with minority populations as well as Scheduled Caste and Scheduled Tribe belts. Across the phase, the average adjudication rate stands at 9.83%, compared with a total deletion rate of 7.13% in the final roll.

The pattern becomes sharper at the constituency level. At least 39 seats in this phase have minority populations above 40% of the electorate. All of them were won by the TMC in 2021. By 2024, however, the electoral picture in these seats had become more fragmented: the TMC won 21, the Congress-Left alliance 11, and the BJP 7.

The concentration of adjudication is especially striking in Malda and Murshidabad. Of the 20 constituencies with the highest adjudication rates in the state, 19 fall in Phase 1 and 16 are located in these two districts alone. These 20 seats have an average minority population of 61.4%, an average adjudication rate of 36.8%, and an average deletion rate of 7.0%. Sujapur recorded 52.5% of its roll under adjudication, followed by Samserganj at 45.9%, Lalgola at 41.4%, and Chakulia at 32.7%.

These figures are not merely administrative. They are electorally significant. In Phase 1, the number of adjudicated voters exceeds the 2024 winning margin in 48% of seats. The overlap is even more pronounced in constituencies that appear to be undergoing political realignment. In all 12 Phase 1 seats won by the Congress-Left alliance in 2024, the number of adjudicated voters is greater than the winning margin.

Phase 2: the TMC fortress

Phase 2 is concentrated in South Bengal and includes Kolkata, North and South 24 Parganas, Howrah, Hooghly and Purba Bardhaman. This zone represents the impregnable core of the TMC’s political machinery. Historically, this region has been an electoral fortress for the incumbent. In 2021, the TMC won a staggering 123 of these seats backed by a deeply entrenched grassroots organisation and seemingly insurmountable vote margins.

Here, the roll revision pattern looks different. Instead of unusually high adjudication rates, the more noticeable feature is the scale of absolute deletions from the voter rolls. In TMC-held seats from 2021 within this phase, deletions average more than 12.7% of the total electorate.

That shift could carry electoral consequences. In areas where the TMC historically benefited from larger margins and a deep booth-level network, a sharper contraction of the voter base could reduce the cushion that once made these constituencies relatively secure. For the BJP, tighter margins could create more openings in areas that were previously difficult to breach.

Officially, the ECI maintains that its scheduling and roll revisions are strictly administrative and security-based. The commission’s manual cites vulnerability mapping, criticality assessments and force availability as the primary drivers for phase planning.

Even so, the combination of a dramatic administrative reshuffle and sharply uneven roll revision patterns across the two phases is likely to remain politically contentious. The commission’s critics argue that these processes cannot be viewed in isolation from the state’s electoral geography.

On election day, this sets the stage for a high-friction ground war. With the ECI and central forces strictly enforcing a stripped-down, highly scrutinised voter list, the TMC will not have the comfort of its historical vote buffer. To defend its South Bengal fortress, the incumbent party will be forced into unprecedented micro-level booth management, relying on its aggressive mobilisation machinery to physically ensure that every remaining legitimate supporter casts a ballot.

With the state’s top administrative brass removed and the electoral rolls fundamentally altered, the upcoming election will test whether historical vote buffers can withstand unprecedented structural shifts.

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