Re: Crazy Stone is playing on CGOS 9x9

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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 <[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]> w=
rote:
>
>> 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 bai=
t
>> 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">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=
"gmail_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]">sligocki@gm=
ail.com</a>&gt; wrote:<br></div><blockquote class=3D"gmail_quote" style=3D"=
margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-lef=
t:1ex"><div dir=3D"ltr"><div dir=3D"ltr">Thanks for sharing the 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:[email protected]" t=
arget=3D"_blank">[email protected]</a>&gt; wrote:<br></div><div class=
=3D"gmail_quote"><blockquote class=3D"gmail_quote" style=3D"margin:0px 0px =
0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div dir=
=3D"ltr"><div>In this game, Crazy Stone won using a typical Monte Carlo tri=
ck:<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/viewe=
r.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 have been a d=
raw had Aya just re-captured it. But Aya took the bait and captured the oth=
er stone. Crazy Stone&#39;s evaluation became instantly winning after this,=
 the sacrificed stone serving as a threat for the winning ko fight, 18 move=
s 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 confusing to my h=
uman brain, couldn&#39;t White move 56 retake the ko and win it? It seems l=
ike Black only has one real ko threat left (J4 maybe). But White also has o=
ne huge threat left (D3), so it seems like White should win this ko and the=
n be about 4 ahead with komi. Am I missing=C2=A0something?</div><div><br></=
div><div>-Shawn</div></div></div>
_______________________________________________<br>
Computer-go mailing list<br>
<a href=3D"mailto:[email protected]" target=3D"_blank">Computer-g=
[email protected]</a><br>
<a href=3D"http://computer-go.org/mailman/listinfo/computer-go" rel=3D"nore=
ferrer" target=3D"_blank">http://computer-go.org/mailman/listinfo/computer-=
go</a><br>
</blockquote></div>

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