<prompt> Qedela umusho olandelayo: USteiner wayeyilungu lamaqembu e-United States Chess Federation athunyelwa phesheya e-Chess Olympiads eHague ngo-1928, Hamburg ngo-1930, ePrague ngo-1931  <response>: IDubrovnik ngo-1950. Njengoba ayengumpetha wase-U.S. wayekaputeni weqembu lika-1950. 