How to answer to 22.i6 ?
Could have been something like 23.g7 but white situation looks tricky : 24.i10 25.h9 26.j12 27.j13 28.f7 29.i7 30.g9 31.l12 32.j8

Thierry - as you know I'm not an expert, but perhaps 23.e8? I think it effectively wins the corner battle do the threat of d6. Rest might go something like: 23.e8 24.e6 25.f5 26.d8 27.g7 28.f9 29.h9 30.g12 31.j13

I have played 22.i6 to manage a "welcome area" to the ladder which I wanted to start from within k15, not to connect on the top.
If Syoku has played 23.e8 I think I would have answered 24.f10. White has to answer at the top to avoid black's connexion. One possible sequence is 23.e8 24.f10 25.g7 26.h9 27.k7.
Then black can play 28.i4 and connect to f10-h9.