[Event "It (c)"] [Site "masterchessopen.com Zittau (Germany)"] [Date "1956.12.29"] [Round "4"] [White "Bergen Peter (AUT)"] [Black "Kallas Hans Joachim"] [Result "0-1"] [WhiteElo "2149"] [ECO "E41"] [Opening "Nimzo-Indian: 4.e3 c5"] 1.d4 Nf6 2.c4 e6 3.Nc3 Bb4 4.e3 c5 5.Ne2 b6 6.a3 Bxc3+ 7.Nxc3 Bb7 8.Bd3 O-O 9.O-O d5 10.cxd5 exd5 11.Qf3 Nc6 12.Rd1 Re8 13.Bc2 cxd4 14.exd4 Nxd4 15.Qd3 Ne6 16.Be3 d4 17.Bxd4 Nxd4 {#R} 0-1