Black's connection  

When White connects at , Black traditionally did likewise at and White finishes the pattern at a.

Aji  

Later, White can exploit the aji in this position by dropping down at a leaving all marked points as possible escape routes. This unsettles the Black group.

Aji  

Instead of in the first diagram, AI wants Black to connect under at here. This leaves aji, in terms of the cutting point at a but this latent vulnerability seems less severe than the one in the previous diagram.

As a consequence, pros and strong amateurs usually don't play the connection but have adapted to cross under.

The drop down

Drop down  

When Black blocks at , due to the presence of a stone on the side, this is the traditional pattern. is a stylish way to prevent a placement, which also makes miai of a and b to live.

However, the side is quite large and so b will soon become a big move for both.

The other drop down  

AI favor here instead. Black now has an open skirt. Defending against it is gote. Not defending against it leaves Black vulnerable to an invasion which doesn't so much scoop out his potential territory as it unsettles the wall.

White's territory is bigger too than in previous diagram. Even if Black may take sente now, these advantages seem enough for AI to discard the traditional joseki.

The slide

corner  

One of the most commonly played joseki of the last decades is also disappearing from the scene. This time the slide of is the culprit. It's not sufficiently active in the battle for sente:

Attach  

Instead AI want to attach at here. This diagram shows one of the variations for , which can also be played at or . In this variation, Black may take sente but this leaves a big corner capture at a. If Black defends at b, White will take sente

Other

In general, AI play 3-3 invasions earlier than what was customary, leaving out the turn that makes Black thick. Also, pincers and early side plays have fallen out of grace, in favor of corner reinforcements, as is mentioned in Leela Zeros opening gospel.