TherapieGo: [current position] + D19C18B18C19A17 It's not alive in Seki but alive with points here and for me B19 in start move is not correct for this reason.
caranthir: Fixed. There was a similar oversight in 493 which was also fixed.
Hrewsahgs: The green solution tree ends in seki. With that in mind, shouldn't this variation be superior as it ends in a thousand-year ko? [current position]
caranthir: [posetcay: Added thousand-year ko variations as alternative answers.] Just for note, if this position occurred in a real game, then playing T15 (after Q19P19S19S18) in sente and fixing the outside shape can easily be more valuable than playing R19 to create mannen ko. Even better suji than that would be T17R18T15T18.
Fixed. There was a similar oversight in 493 which was also fixed.