kovarex: I added few variations where forcing moves before winning were considered wrong. (Mainly securing the stone in atari in sente) before actually living.
Also, I found the problem quite misleading, as it said just black to play, and in normal game, it would be probably better to sacrifice to group, and since we have problems like that, I changed it to black to live to make it clear what is the goal.
Let me know if you disagree.
posetcay: I agree that "black to live" suits this problem better, however atari timing here is very sensitive, if P17-O17-P16-N18-Q19-O19-S16, opponent can play T17 at T18 to kill, so I marked that variation as incorrect.
jhubert: Playing first on D1 and then on A2 to live seems possible, in the winning sequence.
caranthir: jhubert:
Playing first on D1 and then on A2 to live seems possible, in the winning sequence.
caranthir:
Does it work? What about after A18 (in NW coordinates, A2 in SW), the opponent plays B19. For me, there seems to be a problem even in E17F17E16G18D19F19B16, if now A18 instead of B16.
Therefore, only E17F17E16G18 and then B16 OR A18 seem valid to me.
I added few variations where forcing moves before winning were considered wrong. (Mainly securing the stone in atari in sente) before actually living. Also, I found the problem quite misleading, as it said just black to play, and in normal game, it would be probably better to sacrifice to group, and since we have problems like that, I changed it to black to live to make it clear what is the goal. Let me know if you disagree.