RTG Problem 8 / Attempts

Black to move: 6 at 3, 8 at 1  

Alive if Black to move.

Dead if White to move, starting with .

Andre Engels: In your sequence, if White answers at , Black is dead. Therefore I think Black should start at , as below, leading to ko.

Ko  

If White answers at , Grauniad's sequence gives Black life, so White would do best to connect at , and fight a ko with and .

If it's White's move, there are plenty of moves that kill Black. My own preference would be to play White a or b, since they have most influence on the outside.