Sadaharu: Yeah white can answer D19 with B18. Seems like will end up in a double ko and white is still alive.
posetcay: B18 is a very cool move, added it as a refutation to D19 and changed correct answer to B18 as first move (and removed the continuation after E19 because it is unnecessary).
B18 is a very cool move, added it as a refutation to D19 and changed correct answer to B18 as first move (and removed the continuation after E19 because it is unnecessary).