Super Smash Bros Ultimate Nspupdate 1303 [verified]

Global Smash Power (GSP) is the game’s Elo-based ranking system, essentially telling you how many players you are ranked above. Before this patch, players who were about to lose a match could exploit a timing loophole. By disconnecting their internet at a specific moment just as the match ended, the system would fail to register the loss, preventing the player's GSP from dropping.