1.
e4
c5
2.
Nc3
Nc6
3.
g3
g6
4.
Bg2
Bg7
5.
d3
Rb8
6.
Be3
d6
7.
Qc1
b5
8.
Nce2
b4
9.
Nf3
Bg4
10.
h3
Bxf3
11.
Bxf3
Nd4
12.
Bg2
e6
13.
c3
bxc3
14.
bxc3
Nxe2
15.
Kxe2
Ne7
16.
Qa3
O-O
17.
Rhb1
Qc7
18.
Kf1
Rb6
19.
Kg1
Rfb8
20.
Rxb6
Qxb6
21.
Rc1
h5
22.
Qa4
Nc6
23.
Kh2
Qb5
24.
Qa3
Rb6
25.
d4
Bf8
26.
dxc5
dxc5
27.
c4
Qa6
28.
Qd3
Nd4
29.
Bxd4
Rd6
30.
Qb3
Rxd4
31.
Rc2
Qd6
32.
h4
Be7
33.
Kh3
Bf6
34.
Qb5
Kg7
35.
Qb1
Rd3
36.
Qe1
Qd4
37.
Qe2
Rd1
38.
Bf3
Rb1
39.
Rd2
Qa1
40.
Bg2
Rh1+
0-1
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Event
Site
Wageningen
Date
1957.11.09
Round
8
White
Orbaan, Constant
Black
Result
0-1
Score
[Event "Wageningen Zonal"] [Site "Wageningen"] [Date "1957.11.09"] [Round "8"] [White "Orbaan, Constant"] [Black "Ivkov, Borislav"] [Result "0-1"] 1. e4 c5 2. Nc3 Nc6 3. g3 g6 4. Bg2 Bg7 5. d3 Rb8 6. Be3 d6 7. Qc1 b5 8. Nce2 b4 9. Nf3 Bg4 10. h3 Bxf3 11. Bxf3 Nd4 12. Bg2 e6 13. c3 bxc3 14. bxc3 Nxe2 15. Kxe2 Ne7 16. Qa3 O-O 17. Rhb1 Qc7 18. Kf1 Rb6 19. Kg1 Rfb8 20. Rxb6 Qxb6 21. Rc1 h5 22. Qa4 Nc6 23. Kh2 Qb5 24. Qa3 Rb6 25. d4 Bf8 26. dxc5 dxc5 27. c4 Qa6 28. Qd3 Nd4 29. Bxd4 Rd6 30. Qb3 Rxd4 31. Rc2 Qd6 32. h4 Be7 33. Kh3 Bf6 34. Qb5 Kg7 35. Qb1 Rd3 36. Qe1 Qd4 37. Qe2 Rd1 38. Bf3 Rb1 39. Rd2 Qa1 40. Bg2 Rh1+ 0-1