Selection of studies composed by

Nicolai Dimitrievitch Grigoriev

(Russia, 14.8.1895 - 10.11.1938).

More information about him at: Wikipedia,  Chess.com and ChessPro.ru

(All his studies, more exact dates, possible corrections or cooks and exact details about sources can be found in the

Harold van der Heijden database V (31-12-2015) a collection with over 85.000 studies)