[Event "Ch Germany (seniors)"] [Site "masterchessopen.com – Halle (Germany)"] [Date "2011.08.05"] [Round "1"] [White "Knaak Hans (GER)"] [Black "Nachtkamp Herbert (GER)"] [Result "0-1"] [WhiteElo "1765"] [BlackElo "2059"] [ECO "D07"] [Opening "QGD: Chigorin, 3.Nc3 Nf6"] 1.d4 d5 2.c4 Nc6 3.Nc3 Nf6 4.cxd5 Nxd5 5.e4 Nxc3 6.bxc3 e5 7.Be3 exd4 8.cxd4 Bb4+ 9.Bd2 Qxd4 10.Bxb4 Qxe4+ 11.Be2 Qxb4+ 12.Kf1 O-O 13.Nf3 Be6 14.Rb1 Qe7 15.Rxb7 Rab8 16.Rxb8 Rxb8 17.a4 Bf5 18.Bd3 Rd8 19.Ne1 Bxd3+ 20.Nxd3 Qe4 {#R} 0-1