berlou: There is a problem with the sequence
T5 - T4S5 - T8T6 - Q5S4 - T3R6 is killing because of under the stones folowing (R6 - R4 - T9)
I don't know if there is another refutation to this attack though.
Ivan Detkov: I changed the sequence - added a refutation. A17 is a bad move. B16 - C16 leads to a ko.
It looks like an alternative solution.