W plays 1 in diagram 1 and gets a ko.
White 1 and 3 are tesuji. Black 2 in Diagram 1 is not the best answer. Black 4 left of 3 does not work either.
tasuki: Umm, doesn't seem like ajikeshi to me, in fact I can pretty much agree with unkx80.
Tderz: Food for discussion: look closer at the relation of the inter-acting white key points a, b and c. What is their right order?