 Complete the following phrase:  During the 1939 invasion of Poland, his apartment was destroyed and he moved to share an apartment with fellow chess player and his closest collaborator, Marian Wróbel. A Gestapo raid on the apartment in January 1940, during an informal meeting of Warsaw chess players, led to the arrest of all present. The non-Jewish participants were released a week later, Przepiórka and the other Jewish players including Stanisław Kohn and Moishe Lowtzky and Przepiórkas son-in-law Jakub Rabinowicz were subsequently 