                      |
(20) Botvinnik,M - Petrosian,T [D27]
Ch World (match) Moscow (Russia) (20), 1963
1.d4 d5 2.c4 dxc4 3.Nf3 Nf6 4.e3 c5 5.Bxc4 e6 6.0-0 a6 7.Bb3 Nc6 8.Qe2 cxd4 9.Rd1 Be7 10.exd4 Na5 11.Bc2 b5 12.Nc3 Bb7 13.Bg5 0-0 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