Alvaro Morata missed a penalty on his Chelsea debut as Arsenal won an uncharacteristically feisty Community Shield in a shootout at Wembley.

Record signing Morata – a late substitute – dragged a poor effort wide moments after goalkeeper Thibaut Courtois had blazed over in a first use of a new penalty shootout system.

Premier League champions Chelsea had gone ahead through Victor Moses, before Pedro was sent off for an ugly lunge on Mohamed Elneny.

From the resulting free-kick, debutant Sead Kolasinac headed the Gunners level to take the match to penalties.

The shootout – the first in English football to follow the ABBA format – saw Chelsea miss back-to-back penalties to allow Olivier Giroud to win the match from the spot.

Level at 90 minutes, the match went straight to penalties, which were taken in the ABBA format.

Designed to prevent a perceived advantage to the team going first, the system sees team A take the first kick followed by team B – before team B go again. Team A then get two successive penalties, a little like the tie-break in tennis, and so on until there is a winner.

Confused? You are not alone as not even the players seemed to understand.

After Gary Cahill’s opener for Chelsea was cancelled out by Theo Walcott, Arsenal defender Nacho Monreal stepped forward, correctly, to take his kick. However he was waved back by several of his Gunners team-mates, who seemed confused by the new format.

Monreal scored, before Courtois and Morata both missed horribly, to the delight of the Arsenal fans behind the goal.

That allowed first Alex Oxlade-Chamberlain and then Giroud to score and start the Arsenal celebrations.

Day of decisions

The Community Shield can be a rather tame occasion, more pre-season friendly than kick-start, but referee Bobby Madley was kept busy in a fiercely contested affair.

Chelsea were first to be upset when winger Willian was booked for a dive in the first half as he went down under a challenge from Hector Bellerin in the penalty area. Replays suggested that the Brazilian was tripped by his own feet, but also that Bellerin may have made contact beforehand.

If that was a tricky call for Madley, his decision to send off Pedro with 10 minutes remaining was more straightforward. The forward was late and high on Elneny, raking the Arsenal man’s Achilles with his studs.

Antonio Conte was angered by the decision though, and by his team’s marking from the free-kick as they let Kolasinac head home from six yards out.