tasuki: I mean that S2 as the first move is around six points worse than S3. Considering the strictness of the other problems in this collection, I'd say S2 is a mistake.
tasuki: Surely the sacrifice of the three stones is much inferior?
In this collection, losing the first that advantage counts as failure, so I guess losing ~6 points should, too?
Ivan Detkov: I am not sure what you mean. Please explain better.
Marked B18 as wrong.