<prompt> Bhala ukuqhubeka kwalesi sigaba - UNajdorf wadlala izikhathi eziyishumi nanye e-Argentina kuma-Olympics e-Chess kusukela ngo-1950 kuya ku-1976. Wadlala ebhodini lokuqala emdlalweni we-Olympic we-Chess we-9 eDubrovnik ngo-1950 8 0 6, kanye naseHelsinki ngo-1952 11 2 3, e-Amsterdam ngo-1954, eMoscow ngo-1956, eLeipzig ngo-1960, eVarna ngo-1962.  <response>: IHavana ngo-1966, iLugano ngo-1968, iSiegen ngo-1970 neHaifa ngo-1976. Ngesikhathi se-Olympia yaseNice ngo-1974, wadlala ebhodini lesithathu. 