Karpova: FIDE knows Alexander Ostapenko - born in 1962: http://ratings.fide.com/card.phtml?...
There's also an Andrey Ostapenko who played at the Stepchev Memorial in Kiev, 2004: http://mirror01.iptelecom.net.ua/~c... (36th place, seed Nr. 50).This game might have been played by one of them: S Averchenko vs D Ostapenko, 1998
I found these two games without forenames (though I guess they were played by Dmitry):
[Event "Soviet Union"]
[Site "Soviet Union"]
[White "Reucki"]
[Black "Ostapenko"]
[Date "1970.?.?"]
[Result "0-1"]
[ECO "C89"]
1.e4 e5 2.Nf3 Nc6 3.Bb5 a6 4.Ba4 Nf6 5.O-O b5 6.Bb3 Be7 7.Re1 O-O 8.c3 d5 9.exd5 Nxd5 10.Nxe5 Nxe5 11.Rxe5 c6 12.d4 Bd6 13.Re1 Qh4 14.g3 Qh3 15.Be3 Bg4 16.Qd3 Rae8 17.Nd2 Re6 18.a4 f5 19.f4 g5 20.Qf1 Qh5 21.axb5 axb5 22.Ra6 gxf4 23.Rxc6 fxg3 24.Qg2 f4 25.Bxd5 f3 26.Bxe6+ Kh8 27.h3 f2+ 28.Kf1 Bxe6 29.h4 Qxh4 30.Bg5 fxe1=Q+ 31.Kxe1 Qxg5 32.Rxd6 Rf2 0-1
[Event "Soviet Union"]
[Site "Soviet Union"]
[White "Ostapenko"]
[Black "Fomenko"]
[Date "1970.?.?"]
[Result "1-0"]
[ECO "C65"]
1.e4 e5 2.Nf3 Nc6 3.Bb5 Nf6 4.O-O Bc5 5.Nxe5 Nxe4 6.Qg4 Ng5 7.d4 Nxe5 8.Re1 O-O 9.Rxe5 d6 10.Qxg5 dxe5 11.dxc5 Qd1+ 12.Bf1 b6 13.Qd2 Rd8 14.Qxd1 Rxd1 15.Nc3 Re1 16.Rb1 Ba6 17.Be3 Rxb1 18.Nxb1 Bxf1 19.Kxf1 Rd8 20.Ke2 f5 21.f3 Kf7 22.Nc3 bxc5 23.Nb5 a6 24.Nxc7 Rd6 25.c4 Rc6 26.Nd5 Ke6 27.Nc3 1-0
And also one from 1989 but I'm really not sure about that one:
[Event "Krasnoiarsk"]
[Site "Krasnoiarsk"]
[White "Nikolaev, Sergej"]
[Black "Ostapenko"]
[Date "1989.?.?"]
[Result "1/2-1/2"]
[ECO "E10"]
1.d4 Nf6 2.Nf3 c5 3.d5 e6 4.c4 b5 5.Bg5 Qa5+ 6.Nc3 Ne4 7.cxb5 Nxc3 8.bxc3 Qxc3+ 9.Bd2 Qf6 10.e4 Qg6 11.Bd3 d6 12.O-O Be7 13.dxe6 fxe6 14.Bc3 Qh6 15.Bc4 Nd7 16.a4 Nb6 17.Be2 O-O 18.a5 Nd7 19.Nd2 Ne5 20.Bxe5 dxe5 21.Nb3 Qf4 22.Ra4 Rb8 23.Bc4 1/2-1/2
I'd say that further research is necessary before these games are uploaded.