[Event "World Op, Philadelphia"] [Site "World Op, Philadelphia"] [Round "6"] [White "Sergey Kudrin"] [Black "Nick DeFirmian"] [Result "0-1"] [ECO "B90"] [Opening "Sicilian: Najdorf"] 1.e4 c5 2.Nf3 d6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3 a6 6.g3 Nc6 7.Bg2 Bd7 8.O-O e6 9.a4 Be7 10.Nb3 O-O 11.Qe2 Qc7 12.f4 Nb4 13.g4 Nxg4 14.Qxg4 Nxc2 15.Qd1 Nxa1 16.Nxa1 b5 17.Be3 bxa4 18.Nxa4 Rab8 19.Rf2 Bf6 20.Nc3 Rxb2 21.Rxb2 Qxc3 22.Rb3 Qxa1 23.Qxa1 Bxa1 24.Ra3 Bf6 25.Rxa6 e5 26.Rxd6 exf4 27.Bxf4 Be6 28.e5 Be7 29.Ra6 Bc5+ 30.Kh1 h6 31.Ra8 Bc8 32.Be4 g5 33.Bg3 Bh3 34.Rxf8+ Kxf8 35.Bg2 Bxg2+ 36.Kxg2 Ke7 37.Kf3 Ke6 38.Ke4 Bb6 39.Be1 Bc7 40.Bc3 g4 41.Bb2 h5 42.Bd4 h4 43.h3 gxh3 44.Kf3 Bxe5 45.Bb6 Bg3 46.Bd8 f5 47.Bb6 Kd5 48.Ba5 Kc4 49.Bb6 Kb3 50.Bc5 Kc2 51.Bb6 Kd1 52.Ba5 f4 53.Bb6 Ke1 {#R} 0-1