Games played by Jun Koyama (Tokyo, Japan) in this fuseki

425
1
3
6bw
+2 
=1 
-12
?  

1Koyama Jun - Ono Takayuki
2Koyama Jun - Oosumi Yuuki
3Isobe Taizan - Koyama Jun
4Fukui Nobuhiro - Koyama Jun
5Koyama Jun - Kamiya Shunsuke
6Koyama Jun - Maruyama Yasushi