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

23
14
5
4bw
+  
=  
-22
?  

1Kamiya Shunsuke - Koyama Jun
2Koyama Jun - Nakayama Tomoharu
3Kamiya Shunsuke - Koyama Jun
4Koyama Jun - Nakamura Shigeru