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

3
245
1
4bw
+21
=  
-1 
?  

1Koyama Jun - Ono Takayuki
2Koyama Jun - Nakayama Tomoharu
3Koyama Jun - Ishitani Shin-ichi
4Inoue Fumiya - Koyama Jun