▁league ▁with ▁moder ate ▁success ▁until ▁the ▁beginning ▁of ▁the ▁Second ▁World ▁War . ▁▁ ▁At ▁the ▁beginning ▁of ▁the ▁Second ▁World ▁War , ▁the ▁club ▁was ▁renamed ▁B SK . ▁This ▁was ▁the ▁most ▁successful ▁club ▁in ▁the ▁area ▁of ▁the ▁Eastern ▁Ser bia ▁and ▁achieved ▁good ▁results ▁in ▁the ▁Ser bian ▁football ▁compet itions ▁during ▁the ▁war . ▁▁ ▁B SK ▁and ▁another ▁local ▁team ▁Rud ar ▁merged ▁in ▁early ▁ 1 9 4 5 , ▁to ▁form ▁a ▁club ▁with ▁the ▁name ▁of ▁Rad ni č ki . ▁Next ▁year , ▁the ▁club ▁officially ▁changed ▁its ▁name ▁to ▁FK ▁Bor ▁and ▁was ▁engaged ▁in ▁the ▁first ▁organized ▁post - war ▁compet itions . ▁So on ▁the ▁prefix ▁rud ar ski ▁( mean ing ▁the ▁min ers ) ▁was ▁added ▁to ▁the ▁name ▁and ▁the ▁club ▁was ▁known ▁as ▁R F K ▁Bor ▁until ▁ 1 9 7 4 , ▁when ▁it ▁changed ▁back ▁to ▁FK ▁Bor . ▁ ▁R ise ▁to ▁Prom in ence ▁( 1 9 6 0 s ▁and ▁ 1 9 7 0 s ) ▁▁ ▁Vict ories ▁over ▁Rad ni č ki ▁Ni š ▁by ▁ 7 – 0 ▁and ▁Rad ni č ki ▁K rag uje v ac ▁by ▁ 9 – 1 ▁are ▁good ▁examples ▁of ▁some ▁great ▁exhib itions ▁made ▁in ▁the ▁' 5 0 s . ▁Bor ▁played ▁in ▁the ▁Eastern ▁Ser bia ▁regional ▁le agues ▁until ▁ 1 9 6 3 , ▁when ▁it ▁qualified ▁for ▁the ▁Y ug oslav ▁Second