The pawn structure is a factor that primarily decides how the game will progress. In order to play chess on high level, it is necessary to understand the fundamental pawn formations that arise from the openings. GM Andrew Soltis has classified major pawn formations into 22 main categories depending on the opening played. In this article we will focus on 15 most fundamental formations that every chess players must know. This is a very condensed and straight to the point material, which is definitely worth analyzing.