[Event "Cup Hofmann "] [Site "masterchessopen.com Baden (Germany)"] [Round "4"] [White "Knaak Rainer (GER)"] [Black "Korchnoi Viktor (SUI)"] [Result "1-0"] [WhiteElo "2540"] [BlackElo "2635"] [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 Nc6 8.a3 Bxc3 9.bxc3 dxc4 10.Bxc4 Qc7 11.Ba2 e5 12.h3 b6 13.Re1 e4 14.Nd2 Bf5 15.Bb2 Rad8 16.Qe2 Rfe8 17.Bc4 Bg6 18.Nb3 h5 19.Bb5 h4 20.c4 Bh5 21.Qf1 Re7 22.dxc5 bxc5 23.Nxc5 {#r} 1-0