Augusto Farfus claimed his first World Touring Car Championship victory of 2010 after Gabriele Tarquini crashed out of the lead in the Okayama rain
Farfus never put a foot wrong as he passed Norbert Michelisz and Colin Turkington early on to move up to third spot.
The RBM BMW driver, who had not won since Okayama last year, then watched on as long-time leader Michel Nykjaer slid off the road at Attwood on lap nine in his SUNRED SEAT.
Tarquini inherited the lead but kept it for just two laps before driving straight into the barriers at the tight Hobbs right-hander. His crash means he can no longer retain his WTCC crown this year.
What the accident also did was elevate Farfus to a lead he would not lose.
Turkington ended the race just 0.275 seconds behind him, but that was largely due to a late safety car that bunched the field up. Prior to that he had run around a second behind the Brazilian, and the WSR BMW driver had his work cut out to keep Yvan Muller's Chevrolet behind him. Using a succession of wet weather lines, the former British Touring Car champion managed to do just that, equalling the best WTCC result of his career.
With Andy Priaulx spinning into the gravel and out of the race early on, Muller's third place gave him a 37-point lead over the BMW man heading into the Macau season finale. A podium finish in either race on the street circuit will make Muller world champion for a second time.
Race one winner Rob Huff was fourth, ahead of his Chevrolet team-mate Alain Menu and Robert Dahlgren, who drove superbly in his Polestar Volvo.
With Dalhgren not registered for the championship, Nykjaer was the next of the points scorers in seventh, although the Dane did manage another trip across the gravel before the end.
So too did Michelisz, who wound up eighth in his Zengo-Dension SEAT. Tom Coronel (SR-Sport SEAT) was ninth with Darryl O'Young completing the top 10 and taking the independents' win in his bamboo-engineering Chevrolet.
O'Young now trails category leader Sergio Hernandez by just a handful of points after the Spaniard spun out of the race while lying second in class.
Pos Driver Car Time/Gap 1. Augusto Farfus BMW 33m47.799s 2. Colin Turkington BMW + 0.275s 3. Yvan Muller Chevrolet + 0.999s 4. Rob Huff Chevrolet + 2.097s 5. Alain Menu Chevrolet + 3.101s 6. Robert Dahlgren Volvo + 3.440s 7. Michel Nykjaer SEAT + 4.449s 8. Norbert Michelisz SEAT + 5.707s 9. Tom Coronel SEAT + 6.176s 10. Darryl O'Young Chevrolet + 7.336s 11. Franz Engstler BMW + 7.888s 12. Kristian Poulsen BMW + 8.081s 13. Michael Rossi SEAT + 8.546s 14. Fredy Barth SEAT + 9.584s 15. Masataka Yanagida BMW + 10.903s 16. Andrei Romanov BMW + 10.973s 17. Yukinori Taniguchi Chevrolet + 13.311s 18. Stefano D'Aste BMW + 13.954s 19. Nobuteru Taniguchi BMW + 27.382s 20. Mehdi Bennani BMW + 31.379s 21. Kevin Chen BMW + 1 lap 22. Henry Ho BMW + 3 laps Retirements: Sergio Hernandez BMW 11 laps Gabriele Tarquini SEAT 10 laps Tiago Monteiro SEAT 10 laps Yoshihiro Ito BMW 7 laps Andy Priaulx BMW 3 laps
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