1.
e4
c5
2.
Nf3
e6
3.
b4
cxb4
4.
d4
Nf6
5.
Bd3
d5
6.
e5
Nfd7
7.
Ng5
Be7
8.
Qg4
h5
9.
Qg3
Nf8
10.
Nh3
g6
11.
Be3
b6
12.
Nd2
Ba6
13.
Nf3
Nh7
14.
Nfg5
Nxg5
15.
Nxg5
Bxd3
16.
cxd3
Nc6
17.
h4
Qd7
18.
Rc1
Rc8
19.
O-O
Nd8
20.
Qf3
Rxc1
21.
Rxc1
a5
22.
Rc2
Qb7
23.
Qd1
Nc6
24.
Qc1
Bxg5
25.
Bxg5
Nxd4
26.
Rc7
Ne2+
27.
Kf1
Nxc1
28.
Rxb7
Nxa2
29.
Rb8+
Kd7
0-1
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Event
Site
Amsterdam
Date
1969.??.??
Round
5
White
Barendregt, Johan
Black
Result
0-1
[Event "IBM"] [Site "Amsterdam"] [Date "1969.??.??"] [Round "5"] [White "Barendregt, Johan"] [Black "Portisch, Lajos"] [Result "0-1"] 1. e4 c5 2. Nf3 e6 3. b4 cxb4 4. d4 Nf6 5. Bd3 d5 6. e5 Nfd7 7. Ng5 Be7 8. Qg4 h5 9. Qg3 Nf8 10. Nh3 g6 11. Be3 b6 12. Nd2 Ba6 13. Nf3 Nh7 14. Nfg5 Nxg5 15. Nxg5 Bxd3 16. cxd3 Nc6 17. h4 Qd7 18. Rc1 Rc8 19. O-O Nd8 20. Qf3 Rxc1 21. Rxc1 a5 22. Rc2 Qb7 23. Qd1 Nc6 24. Qc1 Bxg5 25. Bxg5 Nxd4 26. Rc7 Ne2+ 27. Kf1 Nxc1 28. Rxb7 Nxa2 29. Rb8+ Kd7 0-1