[Event "It (open)"] [Site "masterchessopen.com Philadelphia (USA)"] [Round "4"] [White "Koenig David E (USA)"] [Black "Grechikhin Vladimir (USA)"] [Result "1-0"] [WhiteElo "2310"] [BlackElo "2164"] [ECO "C60"] [Opening "Spanish: Cozio, 4.O-O g6"] 1.e4 e5 2.Nf3 Nc6 3.Bb5 Nge7 4.O-O g6 5.d4 exd4 6.Bg5 Bg7 7.c3 dxc3 8.Nxc3 f6 9.Bf4 O-O 10.Qd2 d6 11.h3 Bd7 12.Rac1 Rc8 13.Rfd1 Kh8 14.Nd5 Nxd5 15.exd5 Ne5 16.Nd4 Re8 17.Qb4 c5 18.dxc6 bxc6 19.Bxe5 fxe5 20.Nxc6 Qb6 21.Qxd6 Bxh3 22.gxh3 Qxb5 23.Nxa7 {#r} 1-0