West Ham moving forward while Chelsea begin to lurch, should Alvaro Morata be banned and poor Tiemoue Bakoyoko

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David Moyes picked up the first three points of his West Ham tenure at home to Chelsea on Saturday, thanks to an early Marco Arnautovic strike to put another nail in Antonio Conte's hopes of retaining the Premier League title.

Here are five things we learned from the London Stadium...

Whether you agree with the rule about players getting yellow cards for overzealous goal celebrations or not, the rule is still there. Yes, scoring the opening goal against the champions and one of your London rivals is likely to send a rush of blood to the head that you run into the crowd to celebrate, but the rule is still there.

It’s a daft thing to do. As good as Arnautovic’s sixth-minute strike was, he put himself under pressure for the next 84 minutes, which is never a good idea for a player as easily riled as he is. It is an unnecessary thing to do and given that West Ham are likely to be chasing Chelsea for large parts of the game following the goal, it is a risk that Arnautovic could have done without. Fortunately it didn't come back to bite him.

Everton’s Oumar Niasse was the first Premier League player to be banned retrospectively for diving when he was handed a two-game back for deceiving the referee against Crystal Palace last month, but should Alvaro Morata be the second?

The Chelsea forward threw himself to the floor all too easily under a challenge from Winston Reid as the Blues attempted to get back into the game after conceding so early on. There was nowhere near enough contact for him to hit the deck, let alone appeal for a spot-kick – but there was contact. Where is the line for diving? Was he trying to deceive the referee to win a penalty or was he genuinely thrown to the floor? There is a massive grey area here than needs to be clarified.

For two games in a row, West Ham took the lead against a member of the so-called ‘Big Six’, after striking first against Manchester City last weekend. Angelo Ogbonna gave the Hammers the lead at the Etihad before they eventually lost it to an 83^rd-minute David Silva strike.

No team has lost more Premier League games after leading at half-time than West Ham, but, unlike last week, they managed to cement their lead, hold firm during the inevitable onslaught from Chelsea and walk away with three points. Moyes now has the first points of his reign at the London Stadium in a game they were given very little chance in during the lead up. It takes the pressure off the Scot now and will allow him to try and turn this side into one that will remain in the Premier League next season.

Big things were expected of Tiemoue Bakayoko when he joined from Monaco in the summer. He had the physicality of Paul Pogba and looked to have been a fine fit to any Premier League midfield. However, for one reason or another he has been a huge let down and certainly not the upgrade on Nemanja Matic Antonio Conte had hoped for.

He was hooked off at half-time against West Ham as Chelsea piled forward looking for a goal, with Pedro replacing him after he took an age to scuff a shot from a fine position. There will be a point when Conte has to ask himself whether he can afford to keep faith with Bakayoko and wait for him to settle as the team’s performances as a whole are suffering.

They huffed and they puffed but ultimately Chelsea were the ones who were blown away at the London Stadium on Saturday and never really looked like winning the game. They had their chances, territory and pressure, for the last 20 minutes especially, but Adrian in goal for the hosts rarely looked troubled or forced into a brilliant save.

It’s as if Chelsea have had this defeat coming for a while now. They were unconvincing against Swansea two weeks ago, conceded first against Newcastle and slumped into second place in their Champions League group to bring a disappointing end to the group stages. Conte must find a way to revitalise and re-motivate his side or face a real scrap for a top-four place.