![[Diagram]](../../diagrams/9/2a691a6a7ee2362ca67c493612391c02.png)
Black can kill
Dieter: I know the solution now, but I want to discuss here why I find this problem difficult.
- 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
- The 3rd move is a blind spot
![[Diagram]](../../diagrams/34/f1b4d900f0fa0983e5277e2d4ec747db.png)
Reduce
If we play the two reducing moves, then White lives. This shows two vital points.
![[Diagram]](../../diagrams/7/4a00ce03873ced9f8389962410359e07.png)
Reduce
here doesn't work either but already hints at the solution
![[Diagram]](../../diagrams/45/9906d5f446b33d34e09a089fff7c0abe.png)
Reduce 2
If we try
, we fail again
![[Diagram]](../../diagrams/31/3fe1692b1f99038c3cd9a96b3b3e2421.png)
Vital point 1
This is ko and looks like the best Black can do.
![[Diagram]](../../diagrams/9/26a37eadef7d4b2bf821cb6cee95d01c.png)
Vital point 1
Ko again
![[Diagram]](../../diagrams/3/aee0c66f77dab8397dbdbce5dde01555.png)
Vital point 1
Dead
![[Diagram]](../../diagrams/38/d76e69f57329f91b06b4b089ec0e2aea.png)
Vital point 1
Bad ko
![[Diagram]](../../diagrams/1/88fe017f97a62b2aa364799493d241de.png)
Vital point 2
Fail
![[Diagram]](../../diagrams/1/6bb1b5da08b54ac5dac4a6cde80f0ece.png)
Vital point 2
Fail again
![[Diagram]](../../diagrams/24/4ab5aaecf616155d56541bba8deb560d.png)
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
but
is the blind spot.