NYR 2002 - Suggestion for B 113

New Year's Rengo 2002 (111-120)  

Then

semeai  

Will I win the semaeai?

alternative  

White 6 instead of a gives her crucial liberties later on (a crucial atari in the previous line is no longer an atari). Therefore I think the cut at 1 doesn't work and should be saved as ko threat.

Other opinions?