it. On lap 14, Warwick passed Alliot to move into fourth place, while both Dallaras passed Danner, who dropped to ninth. On lap 15, Larini also passed Alliot, while the Dallaras both passed Arnoux. Boutsen passed Danner and then Arnoux, moving up to eighth. On lap 17, Alliot pitted from fifth, while the Dallaras passed Larini's Osella. Piquet overtook Palmer for 11th. The order at the end of lap 18 was Patrese, Senna, Warwick, Caffi, de Cesaris, Larini, Boutsen, Arnoux, Danner, Piquet, Palmer and Alliot, with Capelli and Moreno a lap adrift. Boutsen pitted his Williams again, finding that slick tyres were not the correct choice. Senna was also still on slick tyres at this stage of the race, and was struggling for traction on the wet parts of the circuit. On lap 21 he pitted for wet tyres and dropped to sixth. De Cesaris and Larini passed Caffi, and further back, Alliot started moving back through the field, passing Palmer and Piquet. On lap 22, Larini passed de Cesaris, taking the Osella into third place. Both Dallaras then pitted, allowing Senna back up to fourth place. Alliot passed Danner and was up to sixth place in the Lola when he spun out of the race on lap 27. Two laps later, Capelli spun out of 12th place. Boutsen moved up a couple of places to fifth, passing Danner and Arnoux again, while Senna finally caught and passed Larini for third. Palmer overtook Danner for eighth place. On lap 34, Larini's Osella failed with electrical problems with the Italian still running strongly in fourth place. Patrese had been on wet tyres since the start, and he finally pitted to change them on lap 35, leaving Warwick, also still on wets, to take the lead of the race in the Arrows. Palmer then crashed out from seventh place in the sole remaining Tyrrell, having secured what would be the fastest lap of the race. It proved to be the only fastest lap of Palmer's career. Senna caught Warwick after the British driver had led for four laps, and passed him on lap 39. Warwick dropped out of the race from second place on the following lap, with engine failure. Piquet passed Arnoux to move up to fifth place. There followed a period of relative stability, with only nine cars left circulating, with 28 laps remaining. Senna led from Patrese and Boutsen,