[Event "Ch Bulgaria"] [Site "masterchessopen.com Sofia (Bulgaria)"] [Date "1963.03.15"] [Round "11"] [White "Kostov Petko"] [Black "Kadrev Zdravko"] [Result "0-1"] [ECO "D85"] [Opening "Gruenfeld: Exchange, 5.e4"] 1.d4 Nf6 2.c4 g6 3.Nc3 d5 4.cxd5 Nxd5 5.e4 Nxc3 6.bxc3 Bg7 7.Bc4 c5 8.Ne2 cxd4 9.cxd4 Nc6 10.Be3 O-O 11.O-O Bg4 12.f3 Na5 13.Bd5 Bc8 14.Qd2 e6 15.Bb3 b6 16.Rac1 Ba6 17.Rfd1 Rc8 18.Rxc8 Qxc8 19.Rc1 Qd7 20.Nf4 Rc8 21.Rxc8+ Qxc8 22.d5 Nc4 23.Bxc4 Qxc4 24.h4 Bc3 25.Qd1 e5 26.Nh3 Qe2 27.Qc1 Bb2 28.Qc7 Qxe3+ 29.Kh2 Bf1 30.Ng5 Qf4+ 31.Kg1 Bb5 32.d6 Qc1+ {#R} 0-1