With the way those dark clouds rolled in to cast a shadow over the Misano circuit just before the start of the 13th race of the year, you'd wonder if Valentino Rossi had sought help from cloud-seeding experts for a timely intervention. For the first two days of the San Marino GP, the sun shone as brightly as it possibly could, and track conditions were ideal for Jorge Lorenzo to exploit session after session, making it look like he was bound to turn Rossi's double-digit lead to a single digit come Sunday.On Sunday, Lorenzo didn't win the race. Neither did Rossi.And yet, Rossi won.A little over a lap after the race began with Lorenzo getting off to an electrifying start, it started to spit. Soon, it turned into proper rain, a scenario none of the 92,000 people in attendance had envisioned. With the tarmac being soaked, the riders, on slick tyres, were reduced to tip-toeing around the track. Lap times went from 1m30s-odd to 1m50s-odd. Unsurprisingly, everyone pitted to jump onto the wet-weather bike. Lorenzo, Rossi and Marc Marquez were all engaged in a fierce battle for the lead, with JL99 leading the way, seemingly unshakeable.But then, the rain stopped for a bit. The track started to dry up, and the soft wet-weather tyres were being destroyed. Chunks of rubber flew under heavy braking as the wait-and-watch game began. Marquez let Rossi through to second place to see what Team Yamaha had in mind. If Lorenzo and Rossi went for the dry-weather bike, so would he.They didn't. So Marquez, keeping the RC213V (which was struggling for grip) in control, dived into the pits to make the switch. Lorenzo, who, by then, had lost the lead to Rossi, waited for The Doctor to show his hand. Despite the pit board urging Lorenzo to come in for a change of machinery, he refused to leave the track. And even then, Rossi avoided heading to the garage for a bike swap. Slow-mo footage revealed the extent to which the front tyre on both M1s was chewed up.Finally, Lorenzo made the move. He pitted while Rossi chose to carry on for one more lap on whatever little was left of those wet-weather tyres. It looked like VR46 may have left it too late, for Lorenzo, on the new slicks, would be 10 seconds faster. Just as Rossi made his way out of the Yamaha garage on his dry bike at the end of Lap 21, the telecast switched to the feed from a gyrocam of a bike lying on its side in the gravel trap.Lorenzo had fluffed it at Turn 15.It was Marquez, who, as it turned out, had been the smartest of them all. He went on to win the race by a comfortable margin, with Bradley Smith - who rode the entire race on slicks - coming second, and Scott Redding notching up his first premier-class podium.Rossi came fifth, and yet, he won. Lorenzo not finishing handed a 23-point lead to the Italian, so it was nothing short of a victory. A crucial result, this one, but Rossi isn't counting the Mallorcan out just yet.'It's true that the championship is a lot more important than winning this race, it's the main target. Fifth is still a good result and we're looking forward to the next race in Aragon. There are still five races left and unfortunately Lorenzo has the ability to win at every single one and Marquez is also always strong, so there are still a lot of points left to fight for,' said the championship leader.Lorenzo suffered a contusion to his right hand, but no bones were broken in that high-speed spill, so he's still hanging in there. He explained what went wrong in the post-race presser.'Two races with bad luck in a row, because the circumstances were wet and abnormal. In Silverstone I didn't have the confidence and here I didn't have the pace to warm up the tyre well, so I entered the corner with slicks that were still cold and lost the rear. I think I've been unlucky this year in general, but especially these last two races, because I could have won both or finished second, but that's racing.'But he is resolute in his desire to deny Rossi that elusive 10th world title.'In previous years, my rivals in the championship crashed and this year it's me who's unlucky, but all is not lost. If I win all the coming races I can still become the World Champion and it wouldn't matter in what position Valentino would finish in.'That's a tall ask, but Lorenzo could well start putting his money where his mouth is on home soil, when the action moves to Aragon in two weeks' time.