https://www.go4go.net/go/games/sgfview/69727
at move 255, B tries to fill in all the dame before connecting the ko. It looks like a good habit in chinese rules, as that can change the result by 2 points.
Unfortunately there are an odd number (7) of dame remaining, so she will lose by 0.5 point anyway, even though (assuming the upper left are ko threats) she has more threats.
Her opponent, however, decides to ignore what looks like a ko threat to resurrect a 30+ point dead group. But showing off her L&D skills on the first line, the group remains dead.
The L&D problem is probably 1d level, but I do find it cute. At move 258, B seems to have several tries such as C19, E19, F19, H18, but nothing seems to work as M19 is the perfect distance away to connect on the 1st line.