Difficult situation for Yates, needs to get rid of Gaudu on Green Mountain who can just follow but doesn't really have the horses to set a proper rhythm.
The only "luck" he has, is that there are multiple riders that might still be able to win. There's hope others will try to attack too, and that everyone leaves it up to FDJ to close that gap. Then he just has to time his all out attack.
The issue I see with this, is that every rider will think the same, they don't want to attack too early, reducing the odds for anyone to get away from Gaudu and not making it hard enough. There's also no other team with 2 riders that could go for it, so no numbers game to be played.
Basically UAE needs to go hard as long as possible (won't be long), and then Yates just needs to attack, set a high pace and hope he's able to drop Gaudu. He's already won it once, so why not take the risk.