1.
Nf3
d5
2.
g3
c6
3.
Bg2
Bg4
4.
d3
e6
5.
Nbd2
Bd6
6.
O-O
Nd7
7.
e4
Ne7
8.
b3
O-O
9.
h3
Bh5
10.
Bb2
Rc8
11.
Qe1
c5
12.
Nh4
Qb6
13.
Qe3
Rfe8
14.
Qg5
Bg6
15.
exd5
Nxd5
16.
Nxg6
hxg6
17.
Bxd5
exd5
18.
Qxd5
Qc7
19.
Nc4
Re6
20.
Rae1
Rce8
21.
Nxd6
1-0
Opening Explorer
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Event
Site
Amsterdam
Date
1969.??.??
Round
4
White
Black
Result
1-0
Score
[Event "IBM"] [Site "Amsterdam"] [Date "1969.??.??"] [Round "4"] [White "Portisch, Lajos"] [Black "Ivkov, Borislav"] [Result "1-0"] 1. Nf3 d5 2. g3 c6 3. Bg2 Bg4 4. d3 e6 5. Nbd2 Bd6 6. O-O Nd7 7. e4 Ne7 8. b3 O-O 9. h3 Bh5 10. Bb2 Rc8 11. Qe1 c5 12. Nh4 Qb6 13. Qe3 Rfe8 14. Qg5 Bg6 15. exd5 Nxd5 16. Nxg6 hxg6 17. Bxd5 exd5 18. Qxd5 Qc7 19. Nc4 Re6 20. Rae1 Rce8 21. Nxd6 1-0