Games played by Sergey Filippov (Moscow, Russia) in this fuseki

5
43
2
1
4bw
+ 2
=  
-2 
?  

1Nikonova Natalya - Filippov Sergey
2Filippov Sergey - Sobolev Mikhail
3Filippov Sergey - Salnikov Pavel
4Nikonova Natalya - Filippov Sergey