Berger was the first Austrian to win an important international correspondence tournament the Monde Illustré 1889–1892, and he did so with the result of 45 wins, no losses, and three draws.
He was editor of the Deutsche Schachzeitung and author of Das Schachproblem und dessen Kunstgerechte Darstellung (Leipzig 1884), Theorie und Praxis der Endspiele (Leipzig 1890), Problemen, Studien und Partien (Leipzig 1914).[4]
Berger was a major endgame study composer, having published more than 100 studies, many of which gave notable contributions to endgame theory. His book Theorie und Praxis der Endspiele (Theory and Practice of the Endgame) was published in 1891, revised in 1922, and supplemented in 1933. This was the first modern comprehensive book on practical endgames, and was the standard work on endgames for decades.[5]
^"Archived copy"(PDF). Archived from the original(PDF) on 2007-07-04. Retrieved 2016-06-23.{{cite web}}: CS1 maint: archived copy as title (link) Name Index to Jeremy Gaige's Chess Tournament Crosstables, An Electronic Edition, Anders Thulin, Malmö, 2004-09-01
^Litmanowicz, Władysław & Giżycki, Jerzy (1986, 1987). Szachy od A do Z. Wydawnictwo Sport i Turystyka Warszawa. ISBN83-217-2481-7 (1. A-M), ISBN83-217-2745-X (2. N-Z)