<prompt> Ngwala tšwetšopele ya serapa se - O ile a bapala bakeng sa Fora ka go 2nd Chess Olympiad kua The Hague ka 1928, 3rd Chess Olympiad yeo e sego ya semmušo kua Munich ka 1936, le 9th Chess Olympiad  <response>: kua Dubrovnik ka 1950. 