In Boxing, SD is the short term and type via. Split Decision. In boxing and for other combat sports, a split decision is when 1 of the 3 judges gives it in favour of one fighter. While the rest give the favour to the other fighter. Split decisions are usually seen as
controversial victories. And many Split decisions can end up overturned and will usually hand a rematch between the two
competitors.
There are multiple famous split decision (SD) matches
one of them Is in 1987 when Marvin "Marvellous" Hagler fought
Sugar Ray Leonard. and another in 2007 when
Oscar De La Hoya fought Floyd Mayweather being the closest Floyd ever came to a defeat.