Antoine Semenyo’s superb flicked finish won the FA Cup for Manchester City against Chelsea and took Pep Guardiola’s trophy count to 20 in 10 years as the club’s coach.In a first half of few chances, Erling Haaland had a goal disallowed for an offside in the build-up and Chelsea appealed without success for a penalty when Abdukodir Khusanov blocked off Joao Pedro in the box.Haaland had not scored in a final for City before the game but he delivered an assist for the opener when he fizzed the ball across goal and Semenyo flicked it with his right foot into the bottom corner.Chelsea again appealed for a penalty when Khusanov again used his strength in the box but it was an optimistic shout and Liam Delap, on as a substitute, headed their best chance of an equaliser wide in stoppage time.In truth it was not a classic final, but Semenyo’s winner will be one that is shown many more times.Here The Athletic’s Michael Cox, Simon Johnson, Sam Lee and Liam Twomey break down the key talking points.How did Semenyo score that?After 70 minutes of largely uneventful, attributional football, you reach the point where — as commentators always say — the match seems destined to be decided either by a mistake or a piece of genius. Happily, it was the latter.The build-up was nice enough: Erling Haaland dropping deep to link play and Bernardo Silva slowing the speed of the attack until Haaland was in a position to make the type of run into the channel that Pep Guardiola’s Manchester City have relied upon regularly over the last decade. Haaland’s driven cut-back was hopeful. Antoine Semenyo’s finish was beautiful.This type of finish — on the volley, with the inside of one foot and directing the ball past the other foot — has become an increasingly common sight in football in the age of such technically gifted forwards. But Semenyo’s touch was wonderful, not simply using the pace on Haaland’s cut-back but actively pushing the ball towards the bottom corner, using the momentum of his run and adding a pirouette as he struck the ball to get the requisite velocity.Images: Getty Images/BBC SportIt was out of keeping with everything that came beforehand, but was a great goal to win an FA Cup final, and a fitting match-winner too. Semenyo has worked his way through the footballing pyramid over the last nine years, having loan spells in the fifth, fourth and third tiers of English football, establishing himself at Championship level with Bristol City, then taking the step up to Premier League football with Bournemouth, then getting his chance at a big club in Manchester City.The final is invariably about the big boys, but the FA Cup is about the whole pyramid — and tonight there will be footballers across the country and down through the leagues, who will be telling their mates that they once played in a match alongside this season’s FA Cup final hero.Michael CoxHow damaging is this for Chelsea?Chelsea have made it a not-so-magnificent seven by losing yet another domestic cup final at Wembley Stadium and perhaps their best chance of playing in European competition next season has gone too.