Argent

I do remember! For me the powerful moment was when Hikaru lost communication with Sai... The way deals with his emotions that entire scene when he realized Sai was no there anymore he felt all alone like a part of himself shattered. Its favorite moment in the entire anime. It really made Hikaru grow as a character because Sai felt he no longer was use to him. Hikaru keeps advancing more further and further constantly changing learning about the game of Go. But Sai remains behind.