1.
g3
d5
2.
Nf3
Nf6
3.
Bg2
c6
4.
O-O
Bf5
5.
d3
h6
6.
Nbd2
e6
7.
Re1
Be7
8.
c3
O-O
9.
b4
a5
10.
Qb3
axb4
11.
cxb4
Qb6
12.
Rb1
Nbd7
13.
a3
Bh7
14.
e4
Ng4
15.
Re2
Nge5
16.
Nxe5
Nxe5
17.
Bb2
Ng6
18.
h4
Rfe8
19.
Rbe1
dxe4
20.
Nxe4
Rad8
21.
h5
Nf8
22.
Qc3
f6
23.
Re3
Kh8
24.
Bh3
Bg8
25.
g4
Bf7
26.
f4
Nh7
27.
g5
Bg8
28.
gxh6
gxh6
29.
Kf1
Bf7
30.
Bxe6
Bxe6
31.
Nc5
Bxc5
32.
Rxe6
Rxe6
33.
Rxe6
Bd4
34.
Qe1
Bxb2
35.
Re8+
Nf8
36.
Qe7
Rxe8
37.
Qxe8
Kg8
0-1
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Event
Site
Lincoln
Date
1969.08.13
Round
4
White
Lapiken, Peter Petrovich
Black
Willis, David W
Result
0-1
Score
[Event "US Open-70"] [Site "Lincoln"] [Date "1969.08.13"] [Round "4"] [White "Lapiken, Peter Petrovich"] [Black "Willis, David W"] [Result "0-1"] 1. g3 d5 2. Nf3 Nf6 3. Bg2 c6 4. O-O Bf5 5. d3 h6 6. Nbd2 e6 7. Re1 Be7 8. c3 O-O 9. b4 a5 10. Qb3 axb4 11. cxb4 Qb6 12. Rb1 Nbd7 13. a3 Bh7 14. e4 Ng4 15. Re2 Nge5 16. Nxe5 Nxe5 17. Bb2 Ng6 18. h4 Rfe8 19. Rbe1 dxe4 20. Nxe4 Rad8 21. h5 Nf8 22. Qc3 f6 23. Re3 Kh8 24. Bh3 Bg8 25. g4 Bf7 26. f4 Nh7 27. g5 Bg8 28. gxh6 gxh6 29. Kf1 Bf7 30. Bxe6 Bxe6 31. Nc5 Bxc5 32. Rxe6 Rxe6 33. Rxe6 Bd4 34. Qe1 Bxb2 35. Re8+ Nf8 36. Qe7 Rxe8 37. Qxe8 Kg8 0-1