[Event "IBM"]
[Site "Amsterdam"]
[Date "1969.??.??"]
[Round "4"]
[White "Darga, Klaus"]
[Black "Hartoch, Robert G"]
[Result "1/2-1/2"]

1. d4 d5 2. c4 e6 3. Nc3 Be7 4. Nf3 Nf6 5. g3 O-O 6. Bg2 Nbd7 7. cxd5 exd5 8. O-O c6 9. Bf4 Re8 10. a3 a5 11. Qc2 Nb6 12. Rad1 g6 13. Ne5 Bf5 14. Qc1 Nfd7 15. h3 g5 16. e4 dxe4 17. Be3 f6 18. g4 Be6 19. Nxd7 Qxd7 20. Nxe4 Nd5 21. Ng3 Rf8 22. Be4 Rae8 23. Nf5 1/2-1/2