[Event "Memorial M.Chigorin (open)"] [Site "masterchessopen.com St. Petersburg (Russia)"] [Date "2004.10.21"] [Round "6"] [White "Ivanov Sergey_ (RUS)"] [Black "Efimenko Zahar (UKR)"] [Result "1-0"] [WhiteElo "2553"] [BlackElo "2594"] [ECO "E47"] [Opening "Nimzo-Indian: 4.e3 O-O 5.Bd3"] 1.d4 Nf6 2.c4 e6 3.Nc3 Bb4 4.e3 O-O 5.Bd3 d5 6.Nf3 c5 7.O-O dxc4 8.Bxc4 Nbd7 9.Qe2 b6 10.Rd1 cxd4 11.Nxd4 Bb7 12.e4 Bxc3 13.bxc3 Qe7 14.f3 Rfc8 15.a4 Ne5 16.Ba3 Qc7 17.Bb3 Nc4 18.Nb5 Qc6 19.Bxc4 Qxc4 20.Rd8+ Rxd8 21.Qxc4 Rac8 22.Qe2 {#r} 1-0