Games played by Konstantin Nikonov (Elektrostal, Russia) as black in this fuseki

425
1
3
21bw
+48
=12
-15
?  

1Nikonov Konstantin - Filinov Vladimir
2Nikonov Konstantin - Klimashin Alexander
3Nikonov Konstantin - Merkulov Artyom
4Nikonov Konstantin - Sirategyan Karen
5Nikonov Konstantin - Filinov Vladimir
6Nikonov Konstantin - Ilyin Dmitry