Born in Temesvár (then Austria-Hungary), he lived in Romania after World War I. He took 4th at Bucharest 1925 (Alexandru Tyroler won), shared 1st with János Balogh at Cernăuți (Chernivtsi) 1930 (Romanian Chess Championship, the title went to his co-winner). Erdélyi was thrice Romanian Champion (1931, 1934, and 1949).
Erdélyi tied for 5-6th at Budapest 1934 (Maróczy Jubilee, Erich Eliskases won), tied for 4-5th at Klosterneuburg 1934 (Karl Gilg and Hans Müller won), and tied for 15-16th at Trenčianske Teplice 1949 (Gideon Ståhlberg won).
He was awarded the International Master title in 1950.
- http://www.anders.thulin.name/SUBJECTS/CHESS/CTCIndex.pdf 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. ISBN 83-217-2481-7 (1. A-M), ISBN 83-217-2745-X (2. N-Z)
- OlimpBase :: the encyclopaedia of team chess
- GER-ch 2nd Aachen 1934 Archived 2010-12-15 at the Wayback Machine
- 1949 Archived 2007-09-27 at the Wayback Machine
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