Substitute Martin Ødegaard thought he’d doubled his side’s lead with 20 minutes to go before his celebrations were cut short. Aubameyang had got the final touch and was offside.
Late on in the game King was inches away from a crucial equaliser. He managed to get around goalkeeper Aaron Ramsdale on the left flank after a defensive mix-up, but the angle was too tight to convert and it struck the side netting.
Kucka was given a second yellow in the final minutes, and was sent off by referee Friend after a challenge on Tavares.
Sambi Lokonga's powerful shot from the edge of the box forced Foster to make a final impressive save, and the introduction of Ashley Fletcher demonstrated attacking intent.
Claudio Ranieri’s side fought to the death and the thousands of away supporters were in full voice until the final whistle, but Watford left the Emirates empty handed.
The international break means the Golden Boys aren’t in action next weekend. They face Manchester United at Vicarage Road next on Saturday, November 20.