Assertion: blizzard's player | /r/CapableOf | allow up to six observers
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Source sentences:
text: The rules of Heroes Brawl change every week: Custom Games - Often used for tournament play, players can create a lobby and make a predetermined match-up of up to five players versus five players, with the ability to choose the map, whether to enable draft mode, and whether to add AI-controlled heroes and/or allow up to six observers.