Career

He played in two Polish championships. In 1926, he tied for 8-9th in Warsaw (1st POL-ch). In 1927, he tied for 5-7th in Łódź (2nd POL-ch).

He left Cracow for Rivne, Volhynia (then Poland), in the 1930s.

During World World War II, he lived in the Soviet Union. After the war, he returned to Poland in 1945/46, and settled in Lower Silesia.

In 1949, Chwojnik emigrated, via Czechoslovakia and Austria, to Israel, where he had changed name to Menachem Oren. He played thrice for Israel in Chess Olympiads: at second board (+6 –4 =3) at Helsinki 1952, third board (+7 –2 =3) at Amsterdam 1954, and fourth board (+2 –2 =4) at Moscow 1956.

Achievements

• Chwojnik was the strongest Cracovian chess player in 1920s. Thrice winner of the Cracow championships (1919, 1925, 1926). He won the Nowy Dziennik tournament in Cracow in 1926.
  
  The event was won by Dawid Przepiórka.
  
  The event was won by Akiba Rubinstein. In 1928, he represented Poland on fourth board at the 2nd Chess Olympiad in The Hague (+4 –3 =4), and won team bronze medal.
  
  He won in the Rivne City championship in 1938. In 1951, he won the Israeli championship and the Tel Aviv City championship.
  
  In 1952, he won again the Tel Aviv City championship.