<prompt> Bhala ukuqhubeka kwalesi sigaba - UHarry Schüssler owazalwa ngoJuni 24, 1957 ungumdlali waseSweden we-Chess Grandmaster GM 1988, ophumelele kabili eSweden Chess Championship 1976, 1978, owathola indondo yesiliva ye-Olympic Chess 1980  <response>: Izindaba 