Maximilian Guenther led Jean-Eric Vergne in a DS Penske 1-2 in the opening Shanghai Formula E race - the first time the pit boost fast-charging format had been used at a track where the high energy saving 'peloton' tactics were likely.

The addition of mandatory pitstops into races that already featured 'pack racing' and two of the newly-powerful attack mode deployments seemed ripe for confusion going into the season. With all the pitstop races so far taking place on tighter tracks where the 'peloton' tactic wasn't needed, the opening race at the modified version of Formula 1's Chinese Grand Prix venue was the first chance to see if the combination of formats worked.

And though polesitter Guenther won by a massive (by Formula E standards) seven seconds, that was down to excellent tactics of having a little attack mode and more energy saved than the other frontrunners when the pit window was completed and the pack came back together.

That allowed him to pounce on championship leader Oliver Rowland and make a break. But in his wake, just 2.7s covered second to 10th positions, with Guenther's team-mate Vergne bursting from fourth to second in a final-chicane dive past Dan Ticktum and Taylor Barnard.

A chaotic ending to say the least