At the end of World War II, joining the westward exodus in 1944/45, he — along with many other Baltic players, e.g. Romanas Arlauskas, Lucijs Endzelins, Miervaldis Jursevskis, Leho Laurine, Edmar Mednis, Karlis Ozols, Ortvin Sarapu, Povilas Tautvaišas, Povilas Vaitonis, Elmārs Zemgalis, etc., and Ukrainian players, e.g. Fedor Bohatirchuk, Stepan Popel, Myroslav Turiansky, etc. — moved to the West.
After the war, as a D.P. (Displaced Person) in West Germany, he tied for 12-13th at Augsburg 1946 (Wolfgang Unzicker won), and shared first with Zemgalis at Esslingen 1949. Then, he emigrated to the United States. Dreibergs won twice the Michigan Championship (1954 and 1955). He also played in Correspondence Chess League of America (CCLA).
- Name Index to Jeremy Gaige's Chess Tournament Crosstables, An Electronic Edition, Anders Thulin, Malmö, 2004-09-01
- Aberdeen (Scottish Championship) 1939
- "ch Latvia 1941". Al20102007.narod.ru. Retrieved 2014-01-05.
- "Augsburg 1st 1946 - 365Chess.com Tournaments". 365chess.com. 1946-01-02. Retrieved 2014-01-05.
-  Archived August 14, 2007, at the Wayback Machine.
- CCLA's North American Class Champions
|This biographical article relating to a Latvian chess figure is a stub. You can help Wikipedia by expanding it.|
|This biographical article relating to an American chess figure is a stub. You can help Wikipedia by expanding it.|