Final race positions after 44 laps:
1 K Raikkonen (McLaren)
2 F Alonso (Renault)
3 J Button (BAR)
4 M Webber (Williams)
5 R Barrichello (Ferrari)
6 J Villeneuve (Sauber)
7 R Schumacher (Toyota)
8 T Monteiro (Jordan)
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Lap 44: Kimi Raikkonen takes the chequered flag, 28.3 seconds ahead of championship leader Fernando Alonso. Jenson Button takes the third podium place.
Lap 43: After so much late drama, Raikkonen seems happy to sit on his comfortable lead over Alonso, rather than stretch it and risk his chances of victory.
Lap 42: Out of the blue, from second place, Montoya and Pizzonia clip one another - Pizzonia loses one of his front wheels, and Montoya ends up in the pit wall. Raikkonen is over 37 seconds ahead of second placed Alonso, but the Spaniard now looks sure to move even closer to the points total he needs to clinch the world title.
Lap 40: Leader Raikkonen is now over 18 seconds clear of McLaren team-mate Montoya in second place. Seeing the difference it has made to Webber's times, Barrichello goes into the pits. Out of the blue, from second place, Montoya and Pizzonia clip one another - Pizzonia loses one of his front wheels, and Montoya ends up in the pit wall.
Lap 39: Button passes Barrichello on the Bus Stop turn, moving up into fourth place, but lies over 28 seconds behind third placed Alonso. Webber goes into the pits for the fourth time, to change to dry tyres.
Lap 37: Yellow flags are waved to clear debris from Trulli's crash off the track. Leader Raikkonen is now nearly 11 seconds ahead of Montoya, with Alonso in third place.
Lap 36: Trulli crashes out into the barriers, but walks away unhurt. Button and Webber are locked in battle for fifth place, with the BAR driver coming out on top.
Lap 35: Alonso remains in third place, nearly 20 seconds behind the second placed car of Montoya. Raikkonen makes his second pit stop and returns to the track still over six seconds ahead,.
Lap 33: Montoya, who has led from the start, pits, allowing team-mate Raikkonen to take over at the front. He now leads by over eight seconds, and sets a new fastest lap time of one minute 53.810 seconds.
Lap 32: Raikkonen sets a new fastest lap for the race, as Alonso pits from third place and puts on intermediate tyres.
Lap 31: Monteiro pits from eighth, as Raikkonen closes the gap on Montoya, who now leads by just 1.1 seconds.
Lap 30: Pizzonia and Monteiro both pass eight-placed Villeneueve who seems to be having grip problems. Massa pits from fifth place. Raikkonen cuts down team-mate Montoya's lead, cutting it to under two seconds.
Lap 27: Montoya, who has only pitted once, is still over four seconds clear of Raikkonen, with the serious battles taking place back in the pack, as Barrichello and Webber struggle for fifth place.
Lap 25: Amazingly, Ralf Schumacher pits again to change his tyres for intermediates, having realised he made a mistake, and returns to the race in 12th place. Montoya's lead over Raikkonen is 4.9 seconds, with third placed Alonso over 10 seconds behind the Finn.
Lap 24: Albers, the back marker in the race, pits for the second time. Montoya's lead over Ralf Schumacher stays at one second. Button passes Villeneuve at 186mph to move into eighth place. Schumacher pits to put on dry tyres, and struggles to get back into the race after a spin just after leaving the pits.
Lap 21: Coming up to the midway point in the race, Montoya leads Ralf Schumacher by 1.1 seconds, with Raikkonen third and Alonso fourth both well off the pace.
Lap 20: Fourth placed Villeneuve, the only driver who had not yet pitted, finally does for intermediate tyres and a refuel, and rejoins in eighth place.
Lap 19: Coulthard is forced out when something blows in his engine, as Ralf Schumacher continues to break clear of third placed Raikkonen and eat into Montoya's lead.
Lap 17: Ralf Schumacher is now just 1.9 seconds behind leader Montoya. Alonso in fifth seems to be falling away from Villeneuve in fourth.
Lap 16: Montoya's lead is cut to less than three seconds, with Raikkonen in third seven seconds off the pace. Race officials say they will investigate the Schumacher/Sato clash after the race.
Lap 14: Ralf Schumacher moves into second place, 4.7 secs behind Montoya.
Lap 13: The safety car leaves the track, allowing the race to become competitive once again. Sato clips the back of Michael Schumacher's car, which ends up with the pair of them out of the race, their cars nose to nose. Montoya leads Villeneuve by 3.8 seconds.
Lap 12: Villeneuve seems to be the only one who did go into the pits.
Lap 11: Fisichella spins and crashes out on the Eau Rouge corner, which sends the safety car out. He walks away, seemingly unhurt. With Montoya already in the pits, Raikkonen slows down holding up the cars behind him as they all head to the pits, to give Montoya a chance to get out of the way and leave him with a clear pit lane.
Lap 9: Seventh-placed Ralf Schumacher clocks the fastest lap of the race so far, one minute 56.410 secs. The gap between second placed Raikkonen and third placed Trulli is now 4.6 seconds, as the Finn cuts Montoya's lead to just 0.6 seconds.
Lap 7: Ralf Schumacher overtakes Button to move into seventh place. Doornbos pits. Barrichello lies in 15th place.
Lap 6: With no changes up at the front, Fisichella finds a way past Coulthard and Massa is next in his sights as he tries to fight his way into the points-scoring positions. Montoya's lead is now one second.
Lap 5: Albers is the first driver to pit. Fisichella, who started from 13th place, tries to overtake 10th placed Coulthard but fails. Raikkonen cuts into Montoya's lead, which is now 1.2 secs.
Lap 4: Humidity is rising and the track temperature is dropping, which indicates rain may be on its way. Montoya is 1.5 seconds ahead of his McLaren team-mate Raikkonen, with third placed Trulli over five seconds behind the leader.
Lap 3: A substantial queue is building up behind Sato in sixth place. Alonso lies in fourth, nearly seven seconds off the pace.
Lap 2: Montoya leads by 1.4 secs after the second lap, with a gap of nearly three seconds between second placed Raikkonen and third placed Trulli.
Lap 1: Montoya gets off to a good start and Raikkonen is forced wide at the first corner. It becomes clear straight away that spray and visibility are going to be a problem. Sato jumps from 10th on the grid to seventh on the first lap.
1300: The cars begin their warm-up lap without any problems. Rain from earlier in the day causes some spray on the track, but the surface is mainly dry.
Pre-race: Renault's Fernando Alonso starts from fourth place on the grid, within touching distance of becoming the youngest world champion in Formula One history, at the age of 24. All he needs to do is score four points more than closest rival Kimi Raikkonen.
Giancarlo Fisichella qualified in third place but was relegated 10 places on the grid because he changed his engine.
After a morning of heavy rain, pre-race conditions are dry, but more rain is forecast during the race.