Arsenal will take a narrow advantage into the second leg of their Carabao Cup semi-final after a frantic 3-2 first-leg win at Chelsea.
Goals from Ben White, Viktor Gyokeres and Martin Zubimendi saw the Gunners take victory at Stamford Bridge, but Alejandro Garnacho struck on two occasions after coming off the bench.
But Arsenal will have belief they are on track to reach Wembley, and end Mikel Arteta's record of losing their last four two-legged semi-final ties on the spin.
Liam Rosenior's first home game in charge of Chelsea ended in defeat, but he will have hope of a reversal in the second leg at the Emirates Stadium, which takes place in three weeks on Tuesday February 3.
Gyokeres strikes as Gunners take lead in tie
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Chelsea 0-2 Arsenal
A big moment for Viktor Gyokeres as the striker pounces on a mistake from the Chelsea keeper to double Arsenal's lead.
Rosenior was greeted by warm applause before kick-off, but optimism of a good start vanished after seven minutes as White headed the opener from a trademark Declan Rice delivery from a corner.
Somewhat contentiously, there was a brief VAR check for offside, with Gyokeres potentially interefering on the line as the ball sailed past him. But while it took several minutes to disallow Antoine Semenyo's goal for Man City in a similar incident in the other semi-final, this one was checked and cleared within seconds.
Arsenal's superb set-pieces
Ben White's goal was Arsenal's 24th this season from set-pieces in all competitions, and their 18th just from corners.
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Should Gyokeres have been flagged offside for Arsenal goal?
Jamie Redknapp and Jimmy Floyd Hasselbaink discuss whether Viktor Gyokeres should have been flagged offside for Arsenal's opener against Chelsea in the Carabao Cup semi-final, following Antoine Semenyo's disallowed goal against Newcastle.
Arsenal then took firm control of the tie on 49 minutes as Gyokeres bundled in from close range after Robert Sanchez failed to gather White's cross and it spilled into the striker's path for just his second goal since the start of November.
Rosenior responded with immediate changes, and one of his substititions, Garnacho, fired Chelsea back into the game after Pedro Neto's cross landed at his feet at the far post just before the hour.
Zubimendi restored Arsenal's two-goal advantage on 71 minutes as he slammed in after combining well with Gyokeres, but Garnacho responded again to give Chelsea hope heading into the second leg.