[Event "Leiden"]
[Site "Leiden"]
[Date "1970.??.??"]
[Round "4"]
[White "Donner, Jan Hein"]
[Black "Botvinnik, Mikhail"]
[Result "1/2-1/2"]
[WhiteElo ""]
[BlackElo ""]
[ECO "E91"]

1.d4 g6 2.c4 Bg7 3.Nc3 d6 4.e4 Nf6 5.Be2 O-O 6.Nf3 Bg4 7.O-O Nfd7 8.Be3 e6
9.Ne1 Bxe2 10.Qxe2 Nc6 11.Qd2 e5 12.d5 Nd4 13.Nc2 Nxc2 14.Qxc2 f5 15.f3 Rf7
16.b4 Bf8 17.Rac1 Be7 18.Qd2 Nb6 19.Nd1 c5 20.dxc6 bxc6 21.Nb2 d5 22.c5 d4
23.Bh6 Nd7 24.Nc4 f4 25.g3 Bg5 26.Bxg5 Qxg5 27.Kh1 Qe7 28.g4 Kg7 29.Qd3 a6
30.a4 Ra7 31.Nd6 Rf8 32.Qc4 Rfa8 33.Rb1 Rc7 34.Rfc1 Raa7 35.Qe2 Ra8 36.Nc4 Raa7
37.Kg2 Qe6 38.Qd3 Rcb7 39.Qd2 Rc7 40.Rb2 Nb8 41.h4 Qe7 42.Rh1 Qe6 43.Rc1 Qe7
44.Rh1 Qe6 45.Qd3 Nd7 46.Na5 Rc8 47.g5 h5  1/2-1/2

