is the key. Black can only respond at then after black needs to play to prevent a connnect and die allowing White to start a ko with . Black can back down with at a but after White at b Black will lose a few stones.
-- This looks slightly better than my attempt because W has 3? internal ko threats to use here: the push at c, then the atari at b, and atari above .
fractic: Actually black can use c as a ko-threat but after white answers at b, White can take a stone as a threat. So I guess White should play c first after all.
fractic: In the game I missed Black's correct answer to , fortunatly so did my opponnent. A nice connect and die appears after .