[Event "Olympiad"] [Site "masterchessopenings.com Varna (Bulgaria)"] [Round "0"] [White "Portisch Lajos (HUN)"] [Black "Unzicker Wolfgang (GER)"] [Result "1/2-1/2"] [WhiteElo "2523"] [BlackElo "2433"] [ECO "E46"] [Opening "Nimzo-Indian: 4.e3 O-O"] 1.d4 Nf6 2.c4 e6 3.Nc3 Bb4 4.e3 O-O 5.Nf3 c5 6.Be2 b6 7.O-O Bb7 8.Na4 cxd4 9.exd4 Be7 10.a3 Ne4 11.b4 a5 12.bxa5 bxa5 13.Nd2 Bf6 14.Nxe4 Bxe4 15.Be3 Nc6 16.Rc1 Ne7 17.Nc3 Bb7 18.Bd3 Rc8 19.Nb5 d6 20.Qa4 Bc6 21.Rb1 Rb8 22.Qc2 g6 23.a4 Qd7 24.Rfd1 Rb7 25.Qd2 Ra8 26.Bg5 Bg7 27.Bh6 Bh8 28.Bf4 e5 29.dxe5 dxe5 30.Be3 Nf5 31.Bxf5 Qxf5 32.f3 Rd7 33.Qe2 {#d} 1/2-1/2