[Event "Ch DDR"] [Site "masterchessopen.com – Jena (Germany)"] [Round "9"] [White "Koch Berthold (GDR)"] [Black "Bruechner Siegfried"] [Result "1-0"] [ECO "C03"] [Opening "French: Tarrasch, Guimard, 4.Ngf3"] 1.e4 e6 2.d4 d5 3.Nd2 Nc6 4.Ngf3 Nf6 5.e5 Nd7 6.Nb3 a5 7.a4 f6 8.Bb5 Na7 9.exf6 Qxf6 10.Bg5 Qf7 11.Bd3 b6 12.O-O Be7 13.Qe2 Bf6 14.Rfe1 Nf8 15.Ne5 Bxe5 16.Qxe5 c6 17.Re3 Ng6 18.Qd6 Qd7 19.Qa3 Nf8 20.Rae1 g6 21.Nd2 Qc7 22.Rf3 c5 23.dxc5 Qxc5 24.Qb3 Nc6 25.Bb5 Bd7 26.Bf6 Rg8 27.Rc3 Nd4 28.Bxd4 {#r} 1-0