RTGProblem102/Attempts

Sub-page of RTGProblem102
[Diagram]

Black can kill

Dieter: I know the solution now, but I want to discuss here why I find this problem difficult.

  1. It has a starting width of 6 (for me): 6 moves I can't dismiss without reading. a and b narrow the eyespace, while all of c, d, e and f look like vital points
  2. The 3rd move is a blind spot
[Diagram]

Reduce

If we play the two reducing moves, then White lives. This shows two vital points.

[Diagram]

Reduce

B3 here doesn't work either but already hints at the solution

[Diagram]

Reduce 2

If we try B1, we fail again

[Diagram]

Vital point 1

This is ko and looks like the best Black can do.

[Diagram]

Vital point 1

Ko again

[Diagram]

Vital point 1

Dead

[Diagram]

Vital point 1

Bad ko

[Diagram]

Vital point 2

Fail

[Diagram]

Vital point 2

Fail again

[Diagram]

Vital point 2

Fail



So, I couldn't solve this problem and would definitely misjudge the status here as 'Black can make a ko'.

But black can kill. We have found B1 but B3 is the blind spot.


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