Having it matter which of the stones you capture there is fascinating.
Thanks for the analysis - and thanks for "organizing" this 9x9 testing
party. :)

On Thu, May 7, 2020 at 12:06 PM Rémi Coulom <remi.cou...@gmail.com> wrote:

> If White recaptures the Ko, then Black can play at White's 56, capture the
> stone, and win by 2 points.
>
> On Thu, May 7, 2020 at 5:02 PM Shawn Ligocki <sligo...@gmail.com> wrote:
>
>> Thanks for sharing the games, Rémi!
>>
>> On Thu, May 7, 2020 at 6:27 AM Rémi Coulom <remi.cou...@gmail.com> wrote:
>>
>>> In this game, Crazy Stone won using a typical Monte Carlo trick:
>>> http://www.yss-aya.com/cgos/viewer.cgi?9x9/SGF/2020/05/07/997390.sgf
>>> On move 27, it sacrificed a stone. According to Crazy Stone, the game
>>> would have been a draw had Aya just re-captured it. But Aya took the bait
>>> and captured the other stone. Crazy Stone's evaluation became instantly
>>> winning after this, the sacrificed stone serving as a threat for the
>>> winning ko fight, 18 moves later.
>>>
>>
>> Wow, I did not imagine how that move would be useful later! But the very
>> end is confusing to my human brain, couldn't White move 56 retake the ko
>> and win it? It seems like Black only has one real ko threat left (J4
>> maybe). But White also has one huge threat left (D3), so it seems like
>> White should win this ko and then be about 4 ahead with komi. Am I
>> missing something?
>>
>> -Shawn
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