At night in Kim Sung Ryong's house he showed us some books he studied. Before becoming a professional when he was 14, he studied a lot of famous japanese player's games, from Honinbo Shuwa (本因坊秀和), Honinbo Shuei (本因坊秀栄) to Sakata Eio (坂田 栄男). The books he has are precious and rare, taken directly from Japan, and their value is thousands dollars. Every book contains from 200 to 300 games record, and in order to improve he replayed all the games and he used to finish a book in tree days!