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TI12 Group Stage - Day 1

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Radiant winrate: 56.0000

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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
brewmasterBrewmaster944.44%
OpponentRankRev-RankWinrateAdvantageMatchesWonLostExpected matchesDeviationPercentage
invokerInvoker100.002.78100.00%55.56%2201150.00%
gyrocopterGyrocopter97.2233.33100.00%55.56%22002100.00%
queenofpainQueen of Pain94.4430.56100.00%55.56%11001100.00%
templar_assassinTemplar Assassin91.6725.00100.00%55.56%110100.00%
juggernautJuggernaut88.8922.22100.00%55.56%11001100.00%
visageVisage88.8930.56100.00%55.56%11001100.00%
elder_titanElder Titan88.8922.22100.00%55.56%11001100.00%
kunkkaKunkka80.5613.89100.00%55.56%1102-1-100.00%
batriderBatrider77.7811.11100.00%55.56%11001100.00%
enigmaEnigma77.7822.22100.00%55.56%11001100.00%
slarkSlark77.7811.11100.00%55.56%11001100.00%
rubickRubick77.7811.11100.00%55.56%11001100.00%
spirit_breakerSpirit Breaker66.6741.6750.00%5.56%2111150.00%
bristlebackBristleback66.6741.6750.00%5.56%2111150.00%
beastmasterBeastmaster61.1144.4450.00%5.56%21102100.00%
tuskTusk58.3347.2250.00%5.56%2111150.00%
vengefulspiritVengeful Spirit55.5650.0050.00%5.56%211200.00%
phoenixPhoenix52.7841.6750.00%5.56%2111150.00%
centaurCentaur Warrunner50.0058.330.00%-44.44%101100.00%
dark_willowDark Willow50.0075.000.00%-44.44%101100.00%
grimstrokeGrimstroke50.0058.330.00%-44.44%101100.00%
wispIo41.6794.440.00%-44.44%10101100.00%
naga_sirenNaga Siren38.8991.670.00%-44.44%101100.00%
earthshakerEarthshaker38.8991.670.00%-44.44%101100.00%
treantTreant Protector33.3386.110.00%-44.44%1012-1-100.00%
lone_druidLone Druid30.5683.330.00%-44.44%10101100.00%
chenChen30.5683.330.00%-44.44%10101100.00%
weaverWeaver25.0097.220.00%-44.44%101100.00%
night_stalkerNight Stalker22.22100.000.00%-44.44%20202100.00%
dazzleDazzle19.4475.000.00%-44.44%101100.00%
rikiRiki16.6769.440.00%-44.44%10101100.00%
windrunnerWindranger16.6769.440.00%-44.44%10101100.00%
svenSven11.1163.890.00%-44.44%101100.00%
storm_spiritStorm Spirit8.3361.110.00%-44.44%10101100.00%
puckPuck5.5658.330.00%-44.44%101100.00%
muertaMuerta2.7877.780.00%-44.44%1012-1-100.00%