Practical Endgame Test 4

This is a problem from Magari Reiki's "Koubou No Tesuji" - roughly "Fighting Tesuji"(?) published in 1964. The only point left is the half-point ko at the bottom. Who wins the ko will decide the result of the game. The issue is how to squeeze the most ko threats out of this position for both sides - and of course the final result! --DaveSigaty

Black to Play  

/Hint

/Solution