According to the plan, Chen Xiangbei still needs to run about ten more laps on this set of tires and then make a final pit stop to switch to new red tires for a full push.
But the problem is Rosberg's gamble tactics succeeded, putting him directly ahead of Chen Xiangbei, and with a two-stop strategy, he doesn't need to pit again for tires. There's effectively a pit-stop time difference between the two, which is about 22 seconds.
If Chen Xiangbei wants to regain the lead, he must average a lap time faster than Rosberg by 1 second over the remaining 22 laps!
These numbers may seem exaggerated, but it's not actually impossible.
In the F1 Paddock, on light fuel with brand new soft red tires, many drivers can run laps two or three seconds faster than with old tires!
Take for example the 2019 season Austrian Grand Prix, held at the famed Red Bull Ring.
