1.
c4
Nf6
2.
Nc3
e6
3.
d4
Bb4
4.
e3
c5
5.
Ne2
d5
6.
a3
Ba5
7.
dxc5
dxc4
8.
Qxd8+
Kxd8
9.
Bd2
Nbd7
10.
Ng3
Nxc5
11.
Bxc4
Bc7
12.
Rd1
a6
13.
e4
Bd7
14.
f4
Bc6
15.
e5
Nfd7
16.
Be3
Ke7
17.
O-O
Rhc8
18.
Ba2
Bb6
19.
Rfe1
Na4
20.
Nxa4
Bxe3+
21.
Rxe3
Bxa4
22.
Rd2
Rc1+
23.
Kf2
Rac8
24.
Ne4
R8c2
25.
Rxc2
Rxc2+
26.
Re2
Rxe2+
27.
Kxe2
Bc6
28.
Ke3
Nb6
29.
g3
Na4
30.
b3
Bxe4
31.
bxa4
Bc2
32.
a5
Kd7
33.
Kd4
Kc6
34.
Bc4
Bf5
35.
Be2
b6
36.
g4
Bb1
37.
Bxa6
bxa5
38.
a4
h6
39.
Bb5+
Kb6
40.
h4
Bc2
41.
Be8
Bd1
42.
g5
hxg5
43.
hxg5
Bg4
44.
Bxf7
Bf5
45.
Be8
g6
46.
Bb5
Bc2
47.
Bc4
Bf5
48.
Bb3
Kc6
49.
Bd1
Kb6
50.
Bf3
Bc2
51.
Bg4
Bb3
52.
Bh3
Ba2
53.
Bg2
Bb1
54.
Kc4
Ba2+
55.
Kc3
Bb1
56.
Kd4
Bc2
1/2-1/2
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Event
Site
Amsterdam
Date
1971.07.16
Round
4
White
Black
Donner, Jan Hein
Result
1/2-1/2
[Event "IBM"] [Site "Amsterdam"] [Date "1971.07.16"] [Round "4"] [White "Ivkov, Borislav"] [Black "Donner, Jan Hein"] [Result "1/2-1/2"] 1. c4 Nf6 2. Nc3 e6 3. d4 Bb4 4. e3 c5 5. Ne2 d5 6. a3 Ba5 7. dxc5 dxc4 8. Qxd8+ Kxd8 9. Bd2 Nbd7 10. Ng3 Nxc5 11. Bxc4 Bc7 12. Rd1 a6 13. e4 Bd7 14. f4 Bc6 15. e5 Nfd7 16. Be3 Ke7 17. O-O Rhc8 18. Ba2 Bb6 19. Rfe1 Na4 20. Nxa4 Bxe3+ 21. Rxe3 Bxa4 22. Rd2 Rc1+ 23. Kf2 Rac8 24. Ne4 R8c2 25. Rxc2 Rxc2+ 26. Re2 Rxe2+ 27. Kxe2 Bc6 28. Ke3 Nb6 29. g3 Na4 30. b3 Bxe4 31. bxa4 Bc2 32. a5 Kd7 33. Kd4 Kc6 34. Bc4 Bf5 35. Be2 b6 36. g4 Bb1 37. Bxa6 bxa5 38. a4 h6 39. Bb5+ Kb6 40. h4 Bc2 41. Be8 Bd1 42. g5 hxg5 43. hxg5 Bg4 44. Bxf7 Bf5 45. Be8 g6 46. Bb5 Bc2 47. Bc4 Bf5 48. Bb3 Kc6 49. Bd1 Kb6 50. Bf3 Bc2 51. Bg4 Bb3 52. Bh3 Ba2 53. Bg2 Bb1 54. Kc4 Ba2+ 55. Kc3 Bb1 56. Kd4 Bc2 1/2-1/2