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.