Question: What Swiss racing driver won the 1971 Race of Champions? 

full_context: Document 1: Formula One drivers from Italy: There have been 98 Formula One drivers from Italy including two World Drivers' Champions. Giuseppe "Nino" Farina won the first ever World Drivers' Championship and Alberto Ascari was the first double world champion. All three championships came in the early 1950s and very few Italian drivers have come close since Ascari's 1953 victory. Four of the most experienced Grand Prix drivers in history come from Italy.
Document 2: 1979 Venezuelan motorcycle Grand Prix: The 1979 Venezuelan motorcycle Grand Prix, the first of 13 rounds of the F.I.M. 1979 Grand Prix motorcycle racing season, was held on 18 March at the San Carlos Circuit. British rider Barry Sheene, world champion in 1976 and 1977, won the 500cc GP by 18 seconds from Italian Virginio Ferrari to make it three successive Venezuelan GPs. Venezuelan racer Carlos Lavado won the 350cc class from Italian Walter Villa and Frenchman Patrick Fernandez.
Document 3: 1971 Road Atlanta Can-Am: The 1971 Road Atlanta Can-Am race was the third round of the 1971 Can-Am season. It was held July 11, 1971, at Road Atlanta in Braselton, Georgia. It was the second Can-Am race held at the track.
Document 4: 1971 South African Grand Prix: The 1971 South African Grand Prix, formally the Fifth AA Grand Prix of South Africa (Afrikaans: "Vyfde AA Suid-Afrikaanse Grand Prix"), was a Formula One motor race held at Kyalami Circuit on 6 March 1971. It was race 1 of 11 in both the 1971 World Championship of Drivers and the 1971 International Cup for Formula One Manufacturers. The race was won by Mario Andretti who was driving for the Ferrari team.
Document 5: Antonio Giovinazzi: Antonio Giovinazzi (born 14 December 1993) is an Italian racing driver. He was the 2015 FIA European Formula 3 Championship runner-up and raced with Prema in the 2016 International GP2 Series, finishing in second place with five wins and eight overall podiums. Giovinazzi has been chosen by Scuderia Ferrari as their FIA Formula 1 third and reserve driver for the 2017 season. He made his Formula One Grand Prix debut for Sauber at the 2017 Australian Grand Prix, replacing Pascal Wehrlein. He also replaced Wehrlein at the following Chinese Grand Prix as Wehrlein continued his recovery.
Document 6: 1974 German Grand Prix: The 1974 German Grand Prix was a Formula One motor race held at the Nürburgring on 4 August 1974. It was race 11 of 15 in both the 1974 World Championship of Drivers and the 1974 International Cup for Formula One Manufacturers. It was the 36th German Grand Prix and the 33rd to be held at the Nürburgring complex of circuits. The race was won by Swiss driver Clay Regazzoni driving a Ferrari 312B3. Regazzoni led every lap on the way to his second Grand Prix victory, some four years after his debut victory at the 1970 Italian Grand Prix. South African driver Jody Scheckter was second driving a Tyrrell 007 ahead of Argentine driver Carlos Reutemann (Brabham BT44).
Document 7: 1971 Pau Grand Prix: The 1971 Pau Grand Prix was a Formula Two motor race held on 25 April 1971 at the Pau circuit, in Pau, Pyrénées-Atlantiques, France. The Grand Prix was won by Reine Wisell, driving the Lotus 69C. Jean-Pierre Jabouille finished second and Jean-Pierre Jaussaud third.
Document 8: 1971 Race of Champions: The 6th Race of Champions was a non-Championship motor race, run to Formula One rules, held on 21 March 1971 at Brands Hatch circuit in Kent, UK. The race was run over 50 laps of the circuit, and was won by Clay Regazzoni in a Ferrari 312B2.
Document 9: 1977 Can-Am season: The 1977 Can Am season was the tenth running of the Sports Car Club of America's prototype-based series. Despite the revived name, however, the new series was entirely unrelated to the previous series which had folded in 1974. This series used Formula 5000 Lola T332s with fenders added. Patrick Tambay was declared champion, winning six of the nine races that year for Carl Haas. While Lola chassis dominated the series, a Chevrolet powered Schkee DB1 driven by Tom Klausler won the first race at Mont Tremblant. Formula One driver Gilles Villeneuve came in third at Road America in a Wolf. While Chevrolet was not the only engine supplier, they swept the entire season. This season also marked a resurgence of interest in SCCA events, with Can Am accompanying F5000 and the Trans Am Series seeing a mild resurgence in the eighties.
Document 10: 1961 South African Grand Prix: The 1961 South African Grand Prix, formally titled the 8th International RAC South African Grand Prix, was a non-championship Formula One motor race held at Prince George Circuit, East London, South Africa on 26 December 1961. The race, run over 80 laps of the circuit, was won from pole position by Scotland's Jim Clark, driving a works Lotus-Climax. Englishman Stirling Moss finished second in a private Lotus-Climax, while Swede Jo Bonnier was third in a Porsche.
Document 11: 1971 Trans-American Sedan Championship: The 1971 Trans-American Championship was the sixth running of the Sports Car Club of America's Trans-Am Series. The format was altered to an over 2500cc class and an under 2500cc class, up 500cc from past years. All races used split classes except where noted. The year marked the rise of Datsun as a competitive brand, with the Japanese company winning several races throughout the season. American Motors, led by Mark Donohue's 7 wins, and Datsun, led by John Morton's 6 wins, won the manufacturers' championships.
Document 12: 1971 BRDC International Trophy: The 23rd BRDC International Trophy meeting - formally the GEN/Daily Express BRDC International Trophy - was held on 8 May 1971 at the Silverstone Circuit, England. The race was run to Formula One and Formula 5000 regulations, and was held over two heats of 26 laps each, the final results being an aggregate of the two. Graham Hill emerged the winner in the unique Brabham BT34 "lobster-claw" car, designed by Ron Tauranac. It would be the two-time World Champion's last victory in a Formula One race. The 1971 event was also notable as one of the few competitive outings for the Lotus 56 gas turbine car. However, suspension failure on only the third lap of the first heat resulted in early retirement for driver Emerson Fittipaldi, although the car held together for long enough to take third place in the second heat.
Document 13: Gerhard Berger: Gerhard Berger (born 27 August 1959) is an Austrian former Formula One racing driver. He competed in Formula One for 14 seasons, twice finishing 3rd overall in the championship (1988 and 1994), both times driving for Ferrari. He won ten Grands Prix, achieved 48 podiums, 12 poles and 21 fastest laps. With 210 starts he is amongst the most experienced Formula One drivers of all time. He led 33 of the 210 races he competed in and retired from 95 of them. His first and last victories were also the first and last victories for the Benetton team, with eleven years separating them. He was also a race winner with Ferrari and with McLaren. When at McLaren, Berger drove alongside Ayrton Senna, contributing to the team's 1990 and 1991 constructors titles.
Document 14: Clay Regazzoni: Gianclaudio Giuseppe Regazzoni (5 September 1939 – 15 December 2006), commonly called "Clay", was a Swiss racing driver. He competed in Formula One races from 1970 to 1980, winning five Grands Prix. His first win was the Italian Grand Prix at Monza in his debut season, driving for Ferrari. He remained with the Italian team until . After a single season with BRM, Regazzoni returned to Ferrari for a further three years, to . After finally leaving Ferrari at the end of 1976, Regazzoni joined the Ensign and Shadow teams, before moving to Williams in , where he took the British team's first ever Grand Prix victory, the 1979 British Grand Prix at Silverstone.
Document 15: Reine Wisell: Reine Wisell (born September 30, 1941) is a former racing driver from Sweden. He participated in 23 Formula One World Championship Grands Prix, debuting on October 4, 1970. He achieved 1 podium, and scored a total of 13 championship points. He also participated in several non-Championship Formula One races. He won the Swedish Formula 3 Championship in 1967 and three years later he made the big step and signed with Team Lotus who were the best team this year. In the 1970 United States Grand Prix in Watkins Glen, Wisell raced for Lotus who made their return in the championship after Jochen Rindt's death at Monza. Rindt's death caused his teammate John Miles to retire and Wisell replaced him. His first grand prix was the best in his career as he achieved a third-place finish, trailing only his teammate and future champion Emerson Fittipaldi and Pedro Rodríguez and finishing ahead of title contender Jacky Ickx. This result was Wisell's best, as the subsequent years were not so good for him, and he retired after his home grand prix in 1974.
ground_truth: Clay Regazzoni