Valentino Rossi underlined the importance his victory in the Dutch TT at Assen could play in deciding the outcome of the MotoGP World Championship after stretching his advantage at the top to 10 points.

The Movistar Yamaha rider claimed his third win of the season and his ninth at the legendary circuit after repelling a last-ditch attack by Repsol Honda's Marc Marquez at the final chicane, which saw Rossi stand his M1 upright and power through the gravel after the pair collided.

Rossi succeeded in halting team-mate Jorge Lorenzo's run of four straight premier class wins to extend his lead in the title race after the double MotoGP champion had slashed the Italian's advantage to only a single point coming into the Dutch round.

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With little to choose between the pair this season, Rossi says his victory at Assen is crucial to his hopes of winning at 10th world crown in 2015.

"I knew that I had a great chance because I was competitive for all the weekend, so in the championship like this it is important to take the maximum when you are strong, when you feel good with the bike and the track from the first practice," said the 36-year-old, who won his first race from pole position since San Marino in 2009.

"I think I did a very good race. I was concentrated from the start and did a very good start from the pole position and it is a little bit more easy than from the third row.

"I pushed and had good pace from the beginning and I saw that already Jorge was behind me, so I think that I did a great first lap and a great job at the beginning," he added.

"It was important to me this weekend to try to arrive in front of Jorge because in the last four races he did a perfect job and he recovered to me 28 points.

"I think this victory comes a lot from Barcelona because there we worked in a different way and improved the setting of the bike and I was able to do a great race."

Rossi, though, knows only too well there will be many more twists and turns to come over the duration of the championship but acknowledged this his ninth Assen triumph was among his best.

"Ten points and how many races to the end? Maybe 10 or 11, so it is a long, long way but it is important in the weekend like this to take the maximum profit because for some race tracks for sure it will be more difficult," he said.

"Yes - nine times in Assen like Mugello, so it is one of my favourite tracks for sure. It is difficult to say [if it was his best win at Assen] because also in 2009 it was 100 [Grand Prix wins] but this one is for sure very important for the championship."