It appears that white has two weak groups, plus the upper-left corner is not alive either. But Golaxy had the leisure to play
to capture 4 stones and secure very big teritorry advantage. Note there's aji at 'a' so white probably did not think the groups were under any danger.It ended up in this situation and white only started saving the weak groups at this moment.
Later:
Because of the aji at 'a' white could play this very strong move.
Later:
Black was forced to connect at
and white managed to break out and black's bottom-right group became the defendant.Later:
At this moment, I was thinking that white could play 'a' to at least create a ko fight. But Golaxy knew much better.
a good tesuji, and 
an even better one! White would either be unconditionally alive, or as in the real game, cut off black's central group and kill it!
