Ah, so I'm about the only one here who follows chess.
Well, then, quick refresher course about these two competitors: Born in Russia, Kamsky's family moved to the US when he was young. He was a prodigy in the 90s, even defeating Anand (who is currently world champion) for the right to challenge Karpov in the FIDE tournament cycle. He gave up chess for several years, and upon coming back has not yet gotten back to the level of dominance he once had- he currently is ranked 17th in the world, whereas when he quit he was 4th.
Topalov: Bulgarian, a very strong player with an impressive tournament history. There has been some controversy surrounding him because of his behavior and the behavior of his manager (Danailov) in several incidents, including some baseless accusations that Vladamir Kramnik was using illegal computer analysis during the Kramnik-Topalov world championship match (which Kramnik won). Topalov himself has been accused of cheating, mostly due to some very suspicious behavior of Danailov that looked like hand signals during a few of his games.
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WAR IS PEACE
FREEDOM IS SLAVERY
IGNORANCE IS STRENGTH