<prompt> Qedela umusho olandelayo: Christian Langeweg noma Kick Langeweg owazalwa ngo-7 Mashi 1937, ungumdlali we-chess wase-Dutch International Master IM 1962, owine indondo ye-Dutch Chess Championship izikhathi ezinhlanu 1969, 1970, 1972, 1980, 1983 kanye ne-Chess Olympiad kathathu indondo yomuntu ngamunye  <response>: 1966, 1970, 1980. 