Hikaru no Go

Hikaru and Sai gets word that Toya loses a match in the professional series. Kurata encounters Hikaru and soon decides to play him with an autograph on the line. When the two go to a Go salon, the blacks stones are unavailable. Hikaru must learn how to play One Color Go. Although Kurata lost count of the moves due to over thinking, he made a right move by luck and Hikaru resigns. Though Hikaru resigns from the match, Kurata gives him half his autograph as a gift as he recognized Hikaru strength. (Source: Wikipedia)