Worst Move Problem 7

White to play. Where's the vital point to make the black group alive?  

Solution

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char: This problem is solved by HermanHiddema

DrStraw: I don't understand the purpose of this page. Including tenuki there are 4 moves which allow B to live and only one which kills. Or are you trying to imply that there is only one move which prevents killing B in the future?

Char: I guess I didn't explain it too well. Alive here means it's not "unsettled", meaning black can tenuki and it's still alive.

xela: It seems perfectly clear to me. There is one move that stands out as being even worse than the others. (I find this sort of thing entertaining, although I'm unsure as to whether it's useful. I suppose it's a good exercise in being disciplined with your reading, not jumping to conclusions.)