Kwriss:
As mentioned in a previous message W D18, B shouldE18 then its Ko. The sequence given is still seki and title "White to live. (No Ko)"

Thibaut PERRIN:
Oh no, sorry, I just see my mistake --> In this case it is seki.

Thibaut PERRIN:
I agree whit Johannes: After the connexion Q2, the opponent should not play P1. He should play P2 instead and it is a KO.

Johannes:
After black Q2, white should P2 and it's Ko to live.

Johannes:
After black D18, white should E18 and it's Ko to live.