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

4
2
1
35
6bw
+12
= 1
-2 
?  

1Koyama Jun - Kudomi Takahiro
2Ishitani Shin-ichi - Koyama Jun
3Iio Yoshihiro - Koyama Jun
4Koyama Jun - Okabe Hiroshi
5Kusajima Masato - Koyama Jun
6Koyama Jun - Okabe Hiroshi