Osss-10 was a bounty hunter during the Galactic Civil War. A former member of the Bounty Hunters' Guild, he became an independent agent like many others after the Guild's destruction. His unorthodox style of hunting was heavily dependent on predicting flight path calculations; he would input dozens if not hundreds of predetermined interception algorithms into his ship's navigational computer, thus leaving his targets with dramatically limited choices.
In 4 ABY, Osss-10 attempted to neutralize Boba Fett, who had been aboard N'dru Suhlak's Z-95, in the orbit of Tatooine. Suhlak immediately panicked upon realizing who it was they were dealing with and almost surrendered Fett to the other bounty hunter. Boba's plans didn't include being captured and thus took matters into his own hands, faking-out Osss-10, much to Suhlak's amazement. Boba Fett's improvisatory and unpredictable nature ultimately proved superior to Osss-10's intricate guessing game.