This is the 6340th most frequent Polish word.
bronsteina
"Bronsteina" is not a standard Polish word; it may be a proper noun or misspelling.
Here, the word 'Bronsteina' refers to the genitive case of the surname 'Bronstein', indicating possession or relation.
Książka Bronsteina była inspiracją dla wielu szachistów.
Bronstein's book was an inspiration for many chess players.
In this context, 'Bronsteina' again is in the genitive case of the surname 'Bronstein', used to describe something belonging to Bronstein.
Podziwiam strategię Bronsteina w jego grach szachowych.
I admire Bronstein's strategy in his chess games.
'Bronsteina' here signifies the genitive case of 'Bronstein', indicating that the memoirs are associated with or authored by Bronstein.