Re: Crazy Stone is playing on CGOS 9x9

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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 R=C3=A9mi Coulom <[email protected]> wr=
ote:

> If White recaptures the Ko, then Black can play at White's 56, capture th=
e
> stone, and win by 2 points.
>
> On Thu, May 7, 2020 at 5:02 PM Shawn Ligocki <[email protected]> wrote:
>
>> Thanks for sharing the games, R=C3=A9mi!
>>
>> On Thu, May 7, 2020 at 6:27 AM R=C3=A9mi Coulom <[email protected]> =
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 ba=
it
>>> 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
>> _______________________________________________
>> Computer-go mailing list
>> [email protected]
>> http://computer-go.org/mailman/listinfo/computer-go
>>
> _______________________________________________
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<div dir=3D"ltr">Having it matter which of the stones you capture there is =
fascinating. Thanks for the analysis - and thanks for &quot;organizing&quot=
; this 9x9 testing party. :)</div><br><div class=3D"gmail_quote"><div dir=
=3D"ltr" class=3D"gmail_attr">On Thu, May 7, 2020 at 12:06 PM R=C3=A9mi Cou=
lom &lt;<a href=3D"mailto:[email protected]">[email protected]</a>&=
gt; wrote:<br></div><blockquote class=3D"gmail_quote" style=3D"margin:0px 0=
px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div =
dir=3D"ltr">If White recaptures the Ko, then Black can play at White&#39;s =
56, capture the stone, and win by 2 points.<br></div><br><div class=3D"gmai=
l_quote"><div dir=3D"ltr" class=3D"gmail_attr">On Thu, May 7, 2020 at 5:02 =
PM Shawn Ligocki &lt;<a href=3D"mailto:[email protected]" target=3D"_blank=
">[email protected]</a>&gt; wrote:<br></div><blockquote class=3D"gmail_quo=
te" style=3D"margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204=
);padding-left:1ex"><div dir=3D"ltr"><div dir=3D"ltr">Thanks for sharing th=
e games, R=C3=A9mi!</div><div dir=3D"ltr"><br></div><div dir=3D"ltr">On Thu=
, May 7, 2020 at 6:27 AM R=C3=A9mi Coulom &lt;<a href=3D"mailto:remi.coulom=
@gmail.com" target=3D"_blank">[email protected]</a>&gt; wrote:<br></div=
><div class=3D"gmail_quote"><blockquote class=3D"gmail_quote" style=3D"marg=
in:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1e=
x"><div dir=3D"ltr"><div>In this game, Crazy Stone won using a typical Mont=
e Carlo trick:<br></div><div><a href=3D"http://www.yss-aya.com/cgos/viewer.=
cgi?9x9/SGF/2020/05/07/997390.sgf" target=3D"_blank">http://www.yss-aya.com=
/cgos/viewer.cgi?9x9/SGF/2020/05/07/997390.sgf</a></div><div></div><div>On =
move 27, it sacrificed a stone. According to Crazy Stone, the game would ha=
ve been a draw had Aya just re-captured it. But Aya took the bait and captu=
red the other stone. Crazy Stone&#39;s evaluation became instantly winning =
after this, the sacrificed stone serving as a threat for the winning ko fig=
ht, 18 moves later.</div></div></blockquote><div><br></div><div>Wow, I did =
not imagine how that move would be useful later! But the very end is confus=
ing to my human brain, couldn&#39;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=C2=A0something?</div>=
<div><br></div><div>-Shawn</div></div></div>
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ferrer" target=3D"_blank">http://computer-go.org/mailman/listinfo/computer-=
go</a><br>
</blockquote></div>
_______________________________________________<br>
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ferrer" target=3D"_blank">http://computer-go.org/mailman/listinfo/computer-=
go</a><br>
</blockquote></div>

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