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

3
42
15
4bw
+  
=3 
-1 
?  

1Koyama Jun - Nakayama Tomoharu
2Koyama Jun - Okabe Hiroshi
3Koyama Jun - Gardstrom Petter
4Koyama Jun - Inoue Fumiya