Four die but six live
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On the third line or in the corner on the second line a string of four stones is dead, and a string of six stones is alive. A string of five stones lives or dies according to sente.
Black tries to expand his eyespace with and
, but White plays
and
and Black dies.
at a or
is met with
.
When Black has six stones in a row, White can not kill the stones. -
fails after
.
Bill: doesn't look too good to me. How about Wa or Wb?
SGBailey: ' at a appears to be handled by
' between a and 6. There are potential throw-ins and other complicated stuff depending what path White wriggles with.
Bill: I think White can kill, then.
Bill: Black can make ko, but seki is normally better, no?
SGBailey: ' at b gets
' at a.
Bill: Right. :-)
Can someone show how to live or kill with five ?
Isn't this an application of the above? With 5, whomever has sente can effectively reduce it to 4 or expand to 6. No?
Slowman: How about this? (Please check it :-))
zephi? Unfortunately, 5 on the 3rd line dies even if b has sente. After 6, b can't get 2 eyes. (note: playing b5 one space to the left doesn't work either)
nachtrabe: Sure that isn't a seki?
Chris Hayashida: at
? Then when the outside liberties are filled, White can atari from the inside and make a bulky five shape, killing Black.
SGBailey: The comb formation lives.
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