The fact that Sai killed himself is something that keeos bothering me. To our modern western sensibilities, killing your self because you were banished from court for being a cheater and now you can't play anymore Go, seems, well stupid is not the right word.
But in a world where life expectancy and individuality is not so high, it might make more sense...
Still dead is dead, and you can't play Go when you're dead. Even Sai needs help playing Go this way...