Wholesale Hikaru no Go, Vol. 10 by Yumi Hotta

[Viz] After stumbling across a haunted go board, Hikaru Shindo discovers that the spirit of a master player named Fujiwara-no-Sai has taken up residence in his consciousness. Sai awakens in Hikaru an untapped genius for the game, and soon the schoolboy is chasing his own dream--defeating the famed go prodigy Akira Toya! The main round of the pro test has begun. Everyone's feeling the pressure, no one more so than Hikaru's friend Isumi, who has failed the test twice before. Fighting off his feelings of self-doubt, Isumi faces his next opponent, who turns out to be Hikaru. But a careless mistake lands the pair in an awkward position!