Alan McGowan: He played at Hastings 1930-31, finishing last of 10 players in the Major 'A' tournament. During the event, he gave an 8-board blindfold simul, scoring +2 =4 -2, with most of the games having to be adjudicated, according to the BCM. He was 16 at the time.
Nadel also played at Hastings 1931-32, finishing 1st with a score of 7½ in the Major 'B' event.
He played in the Hauptturnier of the 1931 German championship at Swinemuende.
He was a member of the Schachgesellschaft in Berlin, but his playing opportunities dwindled after 1933 (he was Jewish).
Ceskoslovensky Sach 1938, pp 121-3 show a Nadel in a tournament in Prague. He was 2nd to Miroslav Katetov in Preliminary Group III, defeating him in their individual game. In Final Group 'A' he shared 4th/5th places.
A Zygfryd Nadel arrived in NY on May 19, 1939. The ship's manifest records that he was 24, a tailor, born Berlin, with Prague as his last residence.
His 1940 Declaration of Intention re Naturalization shows that Zygfryd Nadel had adopted the name Fred Nedell, with a NY address. His d.o.b was given as 8 August 1914, though all later records give 4 August 1914.
A brief search online shows a few references to Fred Nedell in Washington State tournaments. (Chess Review 1963, p68 and 1973, p179.)
He died 27 October 1997 in Florida, USA.