Quoted in Time, 31 July 1973. Usually attributed to Robinson, but slightly earlier evidence is found in the Guthrian (Guthrie County, Iowa), 26 Jan. 1970, which printed "Close only counts in horse shoes and grenades."
Aleksandr I. Solzhenitsyn, Anne Applebaum (2007). “The Gulag Archipelago Volume 2: An Experiment in Literary Investigation”, Harper Perennial Modern Classics