[Event "USA-ch/Zonal"]
[Site "South Bend"]
[Date "1981.??.??"]
[Round "4"]
[White "Peters, Jack"]
[Black "Shamkovich, Leonid Alexandrovic"]
[Result "1/2-1/2"]
[WhiteElo "2485"]
[BlackElo "2495"]
1. e4 c5 2. Nf3 Nc6 3. d4 cxd4 4. Nxd4 e6 5. Nc3 d6 6. g3 a6 7. Bg2 Bd7 8. O-O Nf6 9. Nxc6 Bxc6 10. Re1 Rc8 11. a4 Be7 12. Be3 O-O 13. a5 Nd7 14. Na4 g6 15. c4 b5 16. axb6 Bxa4 17. Qxa4 Nxb6 18. Qxa6 Nxc4 19. Bd4 Bf6 20. Bxf6 Qxf6 21. Rac1 Qd4 22. Red1 Qb6 23. Qxb6 Nxb6 24. b4 Rxc1 25. Rxc1 Rc8 26. Rd1 Rc4 27. Rxd6 1/2-1/2