[Event "Candidates qf Petrosian-Portisch +3-2=8"]
[Site "Palma de Mallorca"]
[Date "1974.01.??"]
[Round "11"]
[White "Petrosian, Tigran V"]
[Black "Portisch, Lajos"]
[Result "1/2-1/2"]

1. Nf3 Nf6 2. c4 e6 3. g3 b6 4. Bg2 Bb7 5. Nc3 Be7 6. O-O O-O 7. Re1 Ne4 8. Nxe4 Bxe4 9. d3 Bb7 10. d4 Be4 11. d5 exd5 12. cxd5 Bf6 13. Nd2 Bxg2 14. Kxg2 Re8 15. Rb1 Na6 16. f3 c6 17. dxc6 dxc6 18. Ne4 Be7 19. Qa4 Nb4 20. a3 b5 21. Qb3 Qd5 1/2-1/2