Joachim's Ko-Semeai - Putting the Cart
Before the Horse (2013 - 2015)
E3 - Black's Atari on the Upper Edge
as a Ko-Threat
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Black is unable to give atari at |
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Black's atari on the upper edge is a valid ko-threat, only if White's centre group has less than four liberties, or White has played |

333
: (
944
. Please note that there is no White stone at
yet, so
is no atari.
:
.
. White wins the semeai outright.
already; lets say mistakenly played instead of one of the
-stones (one of which we will remove now for further presentation), ...
:
; 

:
as well.
