- In 1931, at first reserve board in 4th Chess Olympiad in Prague (+7−3=1);
- In 1933, at fourth board in 5th Chess Olympiad in Folkestone (+5−6=3);
- In 1935, at fourth board in 6th Chess Olympiad in Warsaw (+4−4=4);
- In 1936, at fifth board in 3rd unofficial Chess Olympiad in Munich (+7−7=3).
Hasenfuss won individual bronze medal in 1931.
He took 6th at Riga 1932 (Vladimirs Petrovs won), took 4th at Riga 1934 (LAT-ch, Fricis Apšenieks and Petrovs won), tied for 17th–18th at Kemeri 1937 (Samuel Reshevsky, Petrovs and Salo Flohr won), and took 10th at Kemeri / Riga 1939 (Flohr won).
In 1944 Hasenfuss was the leader of the Riga Chess Championship, but due to illness was forced to withdraw from the tournament. His date of death is unknown, but according to unconfirmed reports he died the same year.
- Wolfgang Hasenfuss player profile at chessgames.com
- Wolfgang Hasenfuss player profile at 365chess.com
- Wolfgang Hasenfuss player profile at olimpbase.org
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