[Event "World Championship 25th"] [Site "Moscow RUS"] [Date "1963.05.15"] [Round "20"] [White "Botvinnik, Mikhail M"] [Black "Petrosian, Tigran V"] [Result "1/2-1/2"] [ECO "D27"] [EventDate "1963.03.23"] 1.d4 d5 2.c4 dxc4 3.Nf3 Nf6 4.e3 c5 5.Bxc4 e6 6.O-O a6 7.Bb3 Nc6 8.Qe2 cxd4 9.Rd1 Be7 10.exd4 Na5 11.Bc2 b5 12.Nc3 Bb7 13.Bg5 O-O 14.Rac1 Rc8 15. Bb1 Nc4 16.Ne5 Nb6 17.Qd3 g6 18.Bh6 Re8 19.Qh3 Nc4 20.Nxc4 Rxc4 21.Ne2 Qb6 1/2-1/2