[Event "Capablanca Memorial-03"]
[Site "Havana"]
[Date "1964.08.27"]
[Round "2"]
[White "Donner, Jan Hein"]
[Black "Portisch, Lajos"]
[Result "1/2-1/2"]

1. d4 d5 2. c4 e6 3. Nc3 Nf6 4. cxd5 exd5 5. Bg5 c6 6. e3 h6 7. Bh4 Be7 8. Qc2 O-O 9. Bd3 Nbd7 10. Nf3 Re8 11. O-O Ne4 12. Bxe7 Qxe7 13. b4 Ndf6 14. b5 c5 15. dxc5 Nxc5 16. Rac1 Nce4 17. Qb2 Be6 18. Rc2 Rac8 19. Rfc1 Nc5 20. Be2 Bg4 21. Rd2 Nce4 22. Rdc2 Nxf2 23. Kxf2 Bf5 24. Rd2 Ng4+ 25. Kf1 Qc5 26. Nd4 Nxe3+ 27. Kg1 Be4 28. Bf1 Qb6 29. Na4 Rxc1 30. Qxc1 Qa5 31. Qc3 Qxa4 32. Qxe3 Rc8 33. Bd3 Rc3 34. Nb3 Qb4 35. Qe2 Bxd3 36. Rxd3 Qxb5 1/2-1/2