adum, May I fix the following in your Problem 16?
After 1bs15 2wq14 3bq13 4wr14 5br12 6wq12 7bs14 8ws13 9bs12, white's response should be 10wP13 11bT13 12wQ13 not 10wT13. Black's stones on the right do not have eye space yet.
After 10wT13, 11bP13 connects black's stones. Black has 3 liberties and white has 2 liberties. White loses the capturing race. For instance 12wS16 13bT12 atari (solved) 14w any and black can capture with bT14.
{Posted by LCZLAPINSKI}