Keichou Flowerpots Hikaru no go : Season 3 Episode 4

This episode shows us a young Hikaru, back from 7th grade before the Insei exam. When Sai is disturbed by the owner of a pottery shop, with a face like a toad, Hikaru/Sai must beat the owner who turns out to be a 5dan to prove to everyone what a cheat the owner is. But can he turn around his own play, and win a game someone else has already resigned to help a young girl?