[Event "Ch Bulgaria"] [Site "masterchessopenings.com Sofia (Bulgaria)"] [Date "1962.02.10"] [Round "8"] [White "Filchev Rusko"] [Black "Kolarov Atanas S (BUL)"] [Result "1/2-1/2"] [BlackElo "2415"] [ECO "E21"] [Opening "Nimzo-Indian: Three Knights"] 1.d4 Nf6 2.c4 e6 3.Nc3 Bb4 4.Nf3 c5 5.e3 O-O 6.Be2 Nc6 7.O-O Bxc3 8.bxc3 d6 9.Nd2 e5 10.Nb3 Qe7 11.f3 Re8 12.e4 Nd8 13.Re1 Ne6 14.g3 h6 15.Be3 b6 16.Qd2 Bd7 17.a4 a5 18.d5 Nf8 19.Reb1 Rab8 20.Bd1 g5 21.Qg2 Ng6 22.Nd2 Kh7 23.Kh1 Rg8 24.Qf1 Ne8 25.Rb2 Ng7 26.Rab1 Qd8 27.Nb3 Rc8 28.Nd2 Rb8 29.Nb3 Rc8 30.Nd2 Rb8 {#d} 1/2-1/2