Joachim's Ko-Semeai - Putting the Cart
Before the Horse (2013 - 2015)
0c - An Additional Outside Liberty for Black
( 960) (Referenced by 971; 971; 972; 995) We have seen so far that Black would win the ko-fight, if he had one external ko-threat (more than White). Let us analyse now what happens in the case that Black had an additional external liberty. For this purpose, we will take White's -stone off the board. !!! Please be aware that White must have made a mistake earlier in the sequence to fulfil this assumption. Therefore (as an exception from the rule), we will not adjust the number of Black stones on the board here. !!! |
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Now, the liberty count is five liberties for White (2 * w, 3 * c), and eight liberties for Black (3 * c, 4 * b, k). |
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: Black threatens to give atari at , so only those White moves are valid ko-threats that threaten to take a surrounding Black group of the board (i.e. are also atari). Here in the diagram, Black's -group would be a suitable target (after the preparatory exchange of - played earlier), but for one atari-ko-threat only. |
: Black would win the game, if White ever lost a move unnecessarily. |
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