[Event "Lone Pine"] [Site "Lone Pine CA, USA"] [Date "1979.03.28"] [Round "4"] [White "Perry Youngworth"] [Black "Margeir Petursson"] [Result "0-1"] [ECO "E01"] [Opening "Catalan: 4...c5"] 1.d4 Nf6 2.c4 e6 3.g3 d5 4.Bg2 c5 5.cxd5 Nxd5 6.Nf3 Nc6 7.O-O Be7 8.Nc3 O-O 9.e4 Ndb4 10.d5 exd5 11.exd5 Nd4 12.Nxd4 cxd4 13.a3 dxc3 14.axb4 Bxb4 15.Qd4 Bd6 16.bxc3 a5 17.c4 b6 18.Bb2 f6 19.Rfe1 Bc5 20.Qh4 Ra7 21.Bh3 Bxh3 22.Qxh3 Re7 23.Re6 Rfe8 24.Rae1 Qd7 25.Rxe7 Rxe7 26.Qxd7 Rxd7 27.Kg2 Kf7 28.f4 Ra7 29.Kf3 a4 30.Ke2 Re7+ 31.Kd1 Rxe1+ 32.Kxe1 Ke7 33.Ke2 Kd6 34.g4 b5 35.Kd3 a3 36.Ba1 bxc4+ 37.Kxc4 Be3 38.f5 Bf4 39.Bc3 a2 40.Kb3 Kxd5 41.Kxa2 Bxh2 42.Kb3 Be5 43.Bb4 Bd6 44.Bd2 Ke4 45.Kc4 Bf4 46.Bb4 h5 47.gxh5 Kxf5 48.Kd5 Kg4 49.Bf8 Bh6 50.Ke4 f5+ 51.Ke5 f4 52.Ke4 f3 53.Bc5 Kg3 54.Kd3 Kg2 {#R} 0-1