CHAMPIONS?Gerhard Hecht of Germany retained European light-heavyweight championship by pounding out 15-round decision over Wim Snoek of The Netherlands at Hamburg.
?Ray Famechon of France won back European featherweight title by knocking out Jean Sneyers of Belgium in third round of scheduled 15-round bout at Paris.
?Raton Macias of Mexico won North American bantamweight championship and chance to meet Robert Cohen for world title when he outpointed Nate Brooks of Cleveland in 12-round bout at Mexico City.
CHALLENGERS?Jimmy Carter, former World lightweight champion, won 10-round decision over outclassed Freddy (Babe) Herman in bout held in San Francisco Sept. 22?date of Carter's postponed title bout with Paddy DeMarco, champion.
?Joe Giardello, No. 1 contender for Bobo Olson's middleweight crown, won unanimous decision in 10-round bout with tough Tiger Jones at Philadelphia.
SOVIET SWEEP?Russian chess masters defeated Czechoslovakia 2?-1? in 10th round to clinch Hamilton-Russell trophy, major award in International Chess Olympics at Amsterdam. Top three at tournament's end: Russia, 34-10; Yugoslavia, 25?-14?; Argentina, 24?-15?
RETIRED?George Mikan, 30, basketball's Player of the Half Century and key man for Minneapolis Lakers in six championships during seven years of NBA competition; to devote full time to law practice. Mikan, 6-foot-10 center, was named All America at De Paul College in 1945-46, averaged 23.05 points per game during peak years as pro, once scored 61 in game against Rochester Royals. NBA career total: 10.963 points.