On numerous occasions in the past each has left the other just enough room - but not a centimetre more - to pull off an audacious overtaking move.The most breathtaking example in recent years was during the 2011 Belgian Grand Prix, when Webber overtook Alonso through the daunting Eau Rouge flat-out swerves, each knowing the other would not to do anything that would put them at more risk than was necessary. The Spaniard spoke to CNN World Sport's Amanda DaviesTwo-time Formula One world champion Fernando Alonso will return to the sport with Renault in 2021. "The one you did on Romain Grosjean at the restart in Valencia last year was an incredible passing move - very, very special move. Very challenging. Chat with us in Facebook Messenger. If I get my helicopter licence you can come with me. When you stop for an hour and a half it's really challenging for the drivers, to see how the grip has changed. It was even better, I think. But the force of going into the wall and what I used broke it. In the last laps, Michael was very quick. It was completely unexpected. ""I think it was Malaysia 2012. Nothing changed in our relationship. I think at the end we were even closer than at the beginning." They marked the occasion by getting together with BBC Sport for a dual interview - each asking questions of the other - which will be broadcast ahead of the Spanish Grand Prix this weekend.The result was a rare and fascinating insight into their relationship, the way two top F1 drivers view each other, and the respect that can develop when world-class sportsmen compete for such a long time.Webber and Alonso are famous for their hard but fair on-track battles, trusting their rival to such a degree that they are prepared to put their lives in each other's hands on a regular basis. We stopped the race together," Webber said. "They discovered one piston had a hole in it. "Webber's remarks in that exchange reveal another striking aspect of their conversation - while each clearly holds the other in very high regard, Webber does not trouble to hide the fact that he thinks Alonso is just that bit extra special.The Australian asked Alonso what he felt his best race was, and answered the question himself before his rival had the chance to reply, picking out the Spaniard's outsanding victory at the 2005 San Marino Grand Prix, when Alonso held off Michael Schumacher's charging Ferrari in the closing laps.In recalling the race Alonso revealed a remarkable fact - he completed the entire grand prix with a crippled engine, as a change would have meant a 10-place grid penalty. And the more successful they become, the more that applies.But occasionally one bucks the trend, and in the modern era the rapport between They are not best friends by any measure, but there is genuine affection and mutual esteem there, and they do sometimes spend time together away from races - as was demonstrated by the picture of the two having dinner together that Alonso posted on his Twitter account ahead of last month's Bahrain Grand Prix.The two have been in F1 for exactly the same length of time - each celebrated their 200th race in Bahrain. "It was the four of us going for the win. Some of the rookies that arrive in F1 with a GP2 mentality, it's very risky. I snapped the brake pedal in half with the adrenaline or the pressure or whatever. ""I don't remember," Alonso said. I didn't realise how slick the tyres were. There was one you were not happy with. In the wall. "Going up the hill, I made the really bad mistake of going on to the wet part of the track to cool the tyres. Find out what's happening in the world as it unfolds.Two-time Formula One world champion Fernando Alonso will return to the sport with Renault in 2021. It was a lot of risk. "Probably F1," he said, "because more people are watching, especially my mum. Gone. that when his car took off for the second time at Le Mans he felt he was unlikely to survive, so his reply to Alonso's question is revealing. Two-time Formula One world champion Fernando Alonso will return to the sport with Renault in 2021. The race was…""Yeah, I could manipulate the gap quite easily.