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Huya Dota2 Winter Invitational 2021 Closed Qualifier

Huya, and 富名文贺 jointly presents the tournament in the winter of 2021 (Qualifiers, last 2 days)

Total buybacks: 38

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Explain this to me
The page shows a hero's winrates against certain enemies, as well as winrate advantage (difference in winrate compared to overall value). Higher rank and winrate mean opponent is easier for the hero, higher R-Rank means opponent is picked often and is less effective against the hero.
HeroMatchesWinrate
viperViper250.00%
OpponentRankRev-RankWinrateAdvantageMatchesWonLostExpected matchesDeviationPercentage
storm_spiritStorm Spirit100.0044.44100.00%50.00%11001100.00%
skeleton_kingWraith King88.8933.33100.00%50.00%110100.00%
omniknightOmniknight77.7822.22100.00%50.00%11001100.00%
nyx_assassinNyx Assassin77.7822.22100.00%50.00%11001100.00%
queenofpainQueen of Pain55.5655.5650.00%0.00%2111150.00%
windrunnerWindranger44.44100.000.00%-50.00%10101100.00%
terrorbladeTerrorblade44.44100.000.00%-50.00%10101100.00%
winter_wyvernWinter Wyvern44.44100.000.00%-50.00%10101100.00%
pangolierPangolier44.44100.000.00%-50.00%10101100.00%