Portisch, Lajos VS Benko, Pal C 1971.12.10

[Event "Palma de Mallorca Gran Torneo-07"]
[Site "Palma de Mallorca"]
[Date "1971.12.10"]
[Round "9"]
[White "Portisch, Lajos"]
[Black "Benko, Pal C"]
[Result "1/2-1/2"]

1. d4 Nf6 2. c4 c5 3. d5 b5 4. cxb5 a6 5. e3 g6 6. Nc3 d6 7. Nf3 Bg7 8. bxa6 O-O 9. e4 Qa5 10. Nd2 Bxa6 11. Bxa6 Qxa6 12. Qe2 Nfd7 13. a4 Qxe2+ 14. Kxe2 Na6 15. Rb1 f5 1/2-1/2