1.
d4
Nf6
2.
c4
e6
3.
Nf3
d5
4.
Nc3
c6
5.
e3
Nbd7
6.
Bd3
dxc4
7.
Bxc4
b5
8.
Bd3
a6
9.
e4
c5
10.
d5
e5
11.
b3
Bd6
12.
O-O
O-O
13.
Re1
Rb8
14.
Bf1
Re8
15.
a4
b4
16.
Nb1
Nb6
17.
Nbd2
Re7
18.
Bb2
Ne8
19.
Rc1
f6
20.
a5
Na8
21.
Nc4
Rc7
22.
Nfd2
Bd7
23.
f4
Qe7
24.
fxe5
fxe5
25.
Nxd6
Nxd6
26.
Nc4
Nxc4
27.
Bxc4
1-0
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Event
Site
Petropolis
Date
1973.07.28
Round
4
White
Black
Biyiasas, Peter
Result
1-0
[Event "Interzonal-09b"] [Site "Petropolis"] [Date "1973.07.28"] [Round "4"] [White "Polugaevsky, Lev"] [Black "Biyiasas, Peter"] [Result "1-0"] 1. d4 Nf6 2. c4 e6 3. Nf3 d5 4. Nc3 c6 5. e3 Nbd7 6. Bd3 dxc4 7. Bxc4 b5 8. Bd3 a6 9. e4 c5 10. d5 e5 11. b3 Bd6 12. O-O O-O 13. Re1 Rb8 14. Bf1 Re8 15. a4 b4 16. Nb1 Nb6 17. Nbd2 Re7 18. Bb2 Ne8 19. Rc1 f6 20. a5 Na8 21. Nc4 Rc7 22. Nfd2 Bd7 23. f4 Qe7 24. fxe5 fxe5 25. Nxd6 Nxd6 26. Nc4 Nxc4 27. Bxc4 1-0