Central Russian dialects

Central or Middle Russian dialects is one of the main groups of the Russian dialects. Of Northern Russian origin, it has nonetheless assumed many Southern Russian features.
The official dialect (Standard Russian) originates from a dialect from this group.
Features.
Central Russian is a transitional stage between the North and the South, so some of its dialects closer to the North have northern features, and those closer to the South have the southern ones.
Classification.
There are two types of internal differentiation of Central Russian dialects, the first is based on the methods of linguistic geography (areal classification), the second is based on typological patterns (structural-typological classification)
The most well known and widespread are areal classification.
The main groups in the Central Russian dialects:
Pskov group is transitional to the dialects of the Belarus.