[Event "IBM"]
[Site "Amsterdam"]
[Date "1971.07.20"]
[Round "7"]
[White "Donner, Jan Hein"]
[Black "Adorjan, Andras"]
[Result "1/2-1/2"]

1. d4 Nf6 2. c4 g6 3. Nc3 d5 4. cxd5 Nxd5 5. e4 Nxc3 6. bxc3 Bg7 7. Bc4 c5 8. Ne2 Nc6 9. Be3 O-O 10. O-O Qc7 11. Qc1 b6 12. dxc5 Ne5 13. Bd5 Bb7 1/2-1/2