<prompt> Pedzisa mutsara unotevera: Christian Langeweg kana Kick Langeweg akaberekwa musi wa7 Kurume 1937, muDutch chess International Master IM 1962, kashanu-nguva Dutch Chess Championship medalist 1969, 1970, 1972, 1980, 1983 uye Chess Olympiad katatu-nguva mumwe medalist 1966, 1970,  <response>: 1980. 