Met: I think I was in a new variation and then the position linked to some wrong node. So to reiterate: This black B1 is a wrong move marked correct. W should now respond B2 and get a ko.
Met:
W D1 is a wrong move in this refutation as B A1 kills it. Should have been W A1 instead.
kovarex: I don't see any error in this.
WT19 doesn't kill. THe T19 kills, but with bent four in the corner, which is a lower tier kill compared to normal unconditional kill.
is a wrong move marked correct. W should now respond 
Thanks, fixed.