This is a very fun episode where Waya, Isumi and Hikaru form a team to go around challenging the patrons of the various Go salons. The bet being that they won't have to pay the admission fees in event of a win and Waya raises the stakes even higher by allowing a few moku handicap in subsequent games, much to the protests of Isumi/Hikaru (since they have to wash all the stones if they lose). Hikaru becomes friendly with a particular go salon named 'Heart of Stone' and its patrons. Through this exercise, Hikaru manages to overcome his weakness in playing go with adults.
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Ready to Watch Hikaru no Go, Season 2, Episode 3?