[Event "IBM"]
[Site "Amsterdam"]
[Date "1970.07.29"]
[Round "13"]
[White "Hartoch, Robert G"]
[Black "Ree, Hans"]
[Result "1/2-1/2"]

1. d4 Nf6 2. c4 g6 3. Nc3 Bg7 4. e4 d6 5. Be2 O-O 6. Bg5 c5 7. d5 e6 8. Qd2 exd5 9. exd5 Re8 10. Nf3 Bg4 11. O-O a6 12. h3 Bxf3 13. Bxf3 Nbd7 14. Qc2 Qb6 15. Bd2 Re7 16. Rfe1 Rae8 17. Rxe7 Rxe7 18. a4 Ne8 1/2-1/2