<prompt> Qedela umusho olandelayo: UHarry Schüssler owazalwa ngo-24 Juni 1957 ungumdlali we-chess Grandmaster GM waseSweden 1988, ophumelele kabili iSweden Chess Championship 1976, 1978, ophumelele indondo yesiliva ye-Chess Olympiad  <response>: Ngo-1980. 