Lewis Hamilton took the lead of the world championship from Mark Webber on Sunday, by beating the Australian to victory at slippery Spa-Francorchamps.

As the fickle Belgian Ardennes continued to produce changeable weather conditions, the mere 20-point gap that had separated the top five title chargers blew out to more than 40.

One big loser on Sunday was Fernando Alonso, initially taken out by Rubens Barrichello at the start of the race before crashing on his own at the end.

Also now a long way behind in the championship - 35 points - is Jenson Button, who was innocently taken out by Sebastian Vettel as the Red Bull charger lost control during an overtaking attempt.

"It's a massive blow -- a massive blow," Button said on BBC television, shortly before Vettel said "sorry" in his own media scrum.

There is clearly no love lost between the drivers' management, with McLaren boss Martin Whitmarsh admitting he thinks Vettel "got off lightly" with a drive-through penalty.

Red Bull's Christian Horner naturally adjudged the penalty "a bit too hard".

"What else can you give him?" said Button. "It was a racing incident, he didn't do it on purpose."

Horner added: "You need to take into account the difficult weather conditions and that Jenson braked early."

Vettel, scoring no points at Spa and now 31 points behind his teammate, also had to serve extra pitlane time after cutting a tyre on Tonio Liuzzi's Force India.

"Everything that could go wrong for Sebastian went wrong today," boss Horner told German Sky television.

In the sister Red Bull, Webber's second place on Sunday leaves him just 3 points adrift Hamilton and well clear of the next challenger.

He intimated to reporters that the team might now be wise to back him for the last six races of 2010.

"It depends how hungry they are," he said.

But Horner said: "It's too early for that. Sebastian is still in it. We have seen already how quickly the tide can turn."

Pos No Driver Team Laps Time/Retired Grid Pts
1 2 Lewis Hamilton McLaren-Mercedes 44 1:29:04.268 2 25
2 6 Mark Webber RBR-Renault 44 +1.5 secs 1 18
3 11 Robert Kubica Renault 44 +3.4 secs 3 15
4 7 Felipe Massa Ferrari 44 +8.2 secs 6 12
5 14 Adrian Sutil Force India-Mercedes 44 +9.0 secs 8 10
6 4 Nico Rosberg Mercedes GP 44 +12.3 secs 14 8
7 3 Michael Schumacher Mercedes GP 44 +15.5 secs 21 6
8 23 Kamui Kobayashi BMW Sauber-Ferrari 44 +16.6 secs 17 4
9 12 Vitaly Petrov Renault 44 +23.8 secs 23 2
10 17 Jaime Alguersuari STR-Ferrari 44 +29.4 secs 11 1
11 15 Vitantonio Liuzzi Force India-Mercedes 44 +34.8 secs 12
12 22 Pedro de la Rosa BMW Sauber-Ferrari 44 +36.0 secs 24
13 16 Sebastien Buemi STR-Ferrari 44 +39.8 secs 16
14 10 Nico Hulkenberg Williams-Cosworth 43 +1 Lap 9
15 5 Sebastian Vettel RBR-Renault 43 +1 Lap 4
16 19 Heikki Kovalainen Lotus-Cosworth 43 +1 Lap 13
17 25 Lucas di Grassi Virgin-Cosworth 43 +1 Lap 22
18 24 Timo Glock Virgin-Cosworth 43 +1 Lap 20
19 18 Jarno Trulli Lotus-Cosworth 43 +1 Lap 15
20 20 Sakon Yamamoto HRT-Cosworth 42 +2 Laps 19
Ret 8 Fernando Alonso Ferrari 37 Accident 10
Ret 1 Jenson Button McLaren-Mercedes 15 Accident 5
Ret 21 Bruno Senna HRT-Cosworth 5 +39 Laps 18
Ret 9 Rubens Barrichello Williams-Cosworth 0 Accident 7

Schumacher qualified 11th, dropped 10 for impeding car at previous race. Rosberg 12th, dropped 5 for gearbox change. Glock 17th, dropped 5 for blocking in qualifying. Buemi 15th, dropped 3, also for blocking. De la Rosa 22nd, dropped 10 for engine change.

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2010 Belgian Grand Prix - RESULTS