He remained active and successful in competitive chess well into the 1960s and 1970s and he qualified for the finals of the World Championship Candidates ' Matches as late as 1983 .
He remained active and successful in competitive chess well into the 1960s and 1970s and he qualified for the finals of the World Championship Candidates ' matches as late as 1983 .
He remained active and successful in competitive chess well into the 1960s and 1970s and he qualified for the finals of the World Championship Candidates ' matches as late as 1983 .
Simplificar este texto: He remained active and successful in competitive chess well into the 1960s and 1970s and he qualified for the finals of the World Championship Candidates ' Matches as late as 1983 . Producción: