<prompt> Pedzisa mutsara unotevera: Ronald Câmara aiva nhengo yevatongi ve 1972 uye  <response>: 1986 Chess Olympiads, uye mutongi mukuru weWorld Junior Chess Championship muna 1978. Akanga ari Mutevedzeri weMutungamiri weBrazilian Chess Confederation 1970-1976 uye Mutungamiri weFIDE South American Zone 1974-1978. 