Whose record did Susan Butcher break?

Susan Butcher broke the record for the most Iditarod Trail Sled Dog Race victories, surpassing the previous record held by Rick Swenson. Butcher won her first Iditarod in 1986 and went on to secure a total of four championships by 1990, establishing herself as one of the race's legendary figures. Her achievements helped elevate the visibility of women in the sport of dog mushing.