[Event "Siegen olm"]
[Site "Siegen"]
[Date "1970.??.??"]
[Round "11"]
[White "Kortschnoj, Viktor"]
[Black "Ivkov, Borislav"]
[Result "1/2-1/2"]
[WhiteElo ""]
[BlackElo ""]
[ECO "E61"]

1.c4 g6 2.d4 Bg7 3.Nc3 Nf6 4.g3 O-O 5.Bg2 c6 6.e4 d6 7.Nge2 e5 8.h3 Nbd7
9.Be3 a6 10.dxe5 dxe5 11.c5 Qe7 12.Na4 Rd8 13.Qc2 Nf8 14.Nb6 Rb8 15.Nc4 Ne8
16.b4 Be6 17.O-O Bxc4 18.Qxc4 Ne6 19.h4 N8c7 20.Rad1 Nb5 21.a4 Nbd4 22.Bxd4 Nxd4
23.Nxd4 Rxd4 24.Rxd4 exd4 25.a5 Rd8 26.Rd1 h6 27.Qc2 Qd7 28.Bf1 g5 29.hxg5 hxg5
30.Bc4 Re8 31.Kg2 Qe7 32.Re1 Qe5 33.Qb3 Qf6 34.Qd3 Qg6 35.Qe2 g4 36.Bd3 Re5
37.Rh1 Bf6 38.Qd2 Qg7 39.Qb2 Re8 40.Rh5 Re5 41.Rxe5 Bxe5 42.Qe2 Qg5 43.Qd1 Qg6  1/2-1/2

