Long loose ladder from Ke Jie

[Uberdude]

Ke Jie made sabaki nicely with a very long loose ladder today (Zhou resigned rather than playing out another dozen moves or so, there's still quite a way to read to verify it works for black):



I wonder when Ke Jie had read out that loose ladder: when he attached at move 85 c9? Near the end it's a one-way street, but there's quite some early branching in that 50+ move sequence, very impressive!