 Complete the following phrase:  In the first races, Ferrari still used the old 312 B2: the car was no longer competitive, and Ickx only managed one fourth place at the opening GP of the season. The new 312 B3 debuted at the Spanish round, but proved to be slow and unreliable achieving even worse results. In addition to the sports cars, which were beaten by the French Matra, the F1 program of the Italian team was outclassed, and they even skipped some F1 races, notably the Nürburgring. This was not acceptable to Ickx, because the Nürburgring where the German Grand Prix was being held that year was his favorite race track. As a result, he left the team halfway through the season in order to contest the 