Games played by Yuuki Oosumi (Moriyama, Japan) in this fuseki

3
24
15
4bw
+2 
=1 
- 1
?  

1Oosumi Yuuki - Hasegawa Kazuto
2Nakayama Tomoharu - Oosumi Yuuki
3Oosumi Yuuki - Tamada Yoichi
4Oosumi Yuuki - Iio Yoshihiro