Gideon Ståhlberg, Grandmaster who was Sweden's top player for many years and refereed several of Mikhail Botvinnik's world championship matches.
Gideon Ståhlberg, Grandmaster, pemain top asal Swedia selama bertahun-tahun dan menjadi wasit bagi beberapa pertandingan kejuaraan dunia Mikhail Botvinnik.