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Tien from DBZ might be stronger than Krillin, but he's not a human afaik.
Word of God he has distant alien ancestry. This is from material about as canon as the ones saying Krillin is the strongest human, so... yeah.
The on-screen difficulty of duelists with on-screen victories in their on-screen duels against said duelists is not informed, however. Moving to the discussion page.
This. It WOULD be an informed ability if Mai was thoroughly trounced. Thing is, she always came one move away from victory. She just wasn't as pivotal to the plot as Jou was, who would almost certainly be tagged an example had his degree of focus been as limited.
Uhm... When exactly does a hero win without his opponent being "one move away from victory"?
I rarely see a duel where that doesn't happen.
A hero's skill isn't measured by their win record. A duelist can win simply by being lucky or playing a cookie cutter deck.
Put that same kind of duelist against the duelists that beat Mai, and they'll likely get beaten MUCH faster. That, and it isn't a matter of her losing, but also who she loses to, what stage of the respective tournament she loses at, and why she loses. If it were for a careless move against a garden variety duelist, then she would be a case of the trope.
Mai is probably not a good example of Informed Ability. She was thoroughly trouncing Marik until that Ass Pull "Ra needs a chant" thing, her first DOMA duel against Joey is interrupted by the never-seen-before Hermos, and her second duel she beats him.
Haga is probably a really good example of one, though. His duel against Jou was only slightly tilted in his favor due to cheating, and Yami couldn't even use Timaeus, and still managed to defeat him.
Ryuzaki's harder to judge: Espa Roba can't count because Roba cheated. So he's really only lost to Joey twice (and the first time was pure luck due to Time Wizard), so I'd say he doesn't fit.
Marik is not mentioned, and honestly, he should be. Both Mai and Jou were crushing him until the previously mentioned Ass Pull and the fact that Jou passed out.
Is Rando from Yu Yu Hakusho really an example? Sure, we don't see all of his techniques, but he does have a wider variety of basic abilities than anyone else in the series. Everyone else's abilities all fit together in a group or perhaps 2 (Kurama manipulates plants, Hiei has psychic abilities or fire, etc)
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How well does it match the trope?