Barrichello says title fight will be clean

"For me I am doing my work as open as I can - the same way it has been in the past," said Barrichello in Singapore. "There is not going to be a change.

"I think it is fairly clear that we are both commanded to do the best strategy possible for the team, and whoever is the best will win the race and the championship. I am happy with that.

"Nowadays, it would be impossible to try and do something that your team-mate doesn't know. With all the telemetry, with all the conversations, it is going to be impossible to do that. It is fairly open and I am quite happy with that."

The Brazilian is 14 points behind Button in the standings with four races - including this weekend's Singapore Grand Prix - remaining.

Barrichello, who has reduced the gap to Button by 12 points, insists he is not getting too carried away and says he is focusing on each race at is comes.

"Like any other time really," he said about how he will approach the final races. "Some time ago I was 26 points behind. My championship was starting then and I said as a turning point I have to win a race and I did. Then I won another one, which was fantastic. So I have to try and do that again, and keep my feet on the ground.

"I am thinking about the race itself, thinking about the win and trying to take some points out of Jenson Button. That is all I can do. If I started to think too big then that could be a bad thing. I am feet on the ground, working as hard as I can, working on my car to perform well with me on board - and just wishing for the very best."

The veteran Brawn driver admitted, however, he feels this is the closest he has been to the title in his career.

"Yes it is. Especially because it is on equal terms. I've been there before and in situations that you never knew if the team would allow you to do this or that. But now I feel good. I feel that the team has given both drivers the same option, which is to win and push. I am really happy with that."