Andre: I fail to see how i (black) do not live after: b s18, w r19, b s19, w s17, b q18.
If white captures with t17 black answers at q19.
If white retracts at q19 black captures with t17. white can not play at r18 ...
d4rkm4tter: You don't have to give up those two stones that get put into atari. So while you live, it is inferior to the correct solution. The difference is small enough though that we can consider your solution correct too.
Works fine for me.