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Oceanic Esports Dota Championships - Season 1

Major Asian league presented by Oceanic Esports

Average number of buybacks per game by Radiant: 2.3853

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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
storm_spiritStorm Spirit1850.00%
OpponentRankRev-RankWinrateAdvantageMatchesWonLostExpected matchesDeviationPercentage
medusaMedusa100.0047.6266.67%16.67%6423350.00%
ember_spiritEmber Spirit97.6226.1975.00%25.00%4312250.00%
queenofpainQueen of Pain95.2428.5775.00%25.00%431400.00%
earth_spiritEarth Spirit92.867.14100.00%50.00%2201150.00%
snapfireSnapfire90.4830.9566.67%16.67%321300.00%
miranaMirana88.1033.3366.67%16.67%3212133.33%
puckPuck85.7138.1066.67%16.67%3211266.67%
templar_assassinTemplar Assassin83.3335.7166.67%16.67%321300.00%
antimageAnti-Mage80.9585.7150.00%0.00%4221375.00%
baneBane78.5783.3350.00%0.00%422400.00%
kunkkaKunkka76.1980.9550.00%0.00%4222250.00%
tidehunterTidehunter76.1980.9550.00%0.00%4222250.00%
monkey_kingMonkey King71.434.76100.00%50.00%110100.00%
elder_titanElder Titan69.059.52100.00%50.00%11001100.00%
disruptorDisruptor66.6716.67100.00%50.00%110100.00%
treantTreant Protector66.6716.67100.00%50.00%110100.00%
jakiroJakiro66.674.76100.00%50.00%110100.00%
enchantressEnchantress66.6716.67100.00%50.00%110100.00%
shadow_shamanShadow Shaman57.1419.05100.00%50.00%11001100.00%
drow_rangerDrow Ranger54.7621.43100.00%50.00%110100.00%
marsMars52.3823.81100.00%50.00%1105-4-400.00%
weaverWeaver50.0092.8640.00%-10.00%5232360.00%
pangolierPangolier50.0092.8640.00%-10.00%5232360.00%
death_prophetDeath Prophet45.2442.8650.00%0.00%2111150.00%
grimstrokeGrimstroke42.8640.4850.00%0.00%2113-1-50.00%
tinyTiny40.4845.2450.00%0.00%211200.00%
night_stalkerNight Stalker38.1088.1033.33%-16.67%3121266.67%
broodmotherBroodmother35.7176.190.00%-50.00%10101100.00%
void_spiritVoid Spirit33.3371.430.00%-50.00%101100.00%
terrorbladeTerrorblade33.3371.430.00%-50.00%101100.00%
lionLion28.5766.670.00%-50.00%1012-1-100.00%
dark_seerDark Seer26.1964.290.00%-50.00%10101100.00%
rikiRiki26.1976.190.00%-50.00%10101100.00%
spirit_breakerSpirit Breaker21.4359.520.00%-50.00%1012-1-100.00%
centaurCentaur Warrunner19.0557.140.00%-50.00%10101100.00%
wispIo16.6761.900.00%-50.00%1013-2-200.00%
dragon_knightDragon Knight14.2954.760.00%-50.00%101100.00%
ogre_magiOgre Magi11.9095.240.00%-50.00%2023-1-50.00%
life_stealerLifestealer9.5254.760.00%-50.00%101100.00%
shadow_demonShadow Demon7.14100.000.00%-50.00%2021150.00%
invokerInvoker4.7650.000.00%-50.00%10101100.00%
tuskTusk2.38100.000.00%-50.00%2021150.00%