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 Post subject: 6th GLOBIS Cup
Post #1 Posted: Mon Apr 15, 2019 10:07 pm 
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It will be held in Tokyo, Japan.

4/19 1st round. 2nd round
4/20 3rd round, round of 8
4/21 Semi final, Final

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 Post subject: Re: 6th GLOBIS Cup
Post #2 Posted: Tue Apr 16, 2019 4:59 pm 
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Korea; Shin Jinseo(19), Shin Minjoon(20), Park Sangjin(18)
China; Ding Hao(18), Chen Yujian(19), Wang Zejin(20)
Japan; Mutsumura Yuuta(19), Shibano Toramaru(19), Ohnishi Ryuhei(19), Hirose Yuichi(17), Ueno Asami(17) and Niu Eiko(19)
Taiwan;Chen Qirui(18)
Europe;Anton Chernykh(18)
North America;Brandon Zhou(16)
Asia-Oceania;Pongsakarn SORNARRA(12)

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 Post subject: Re: 6th GLOBIS Cup
Post #3 Posted: Thu Apr 18, 2019 8:47 pm 
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Globis cup is using double elimination format.

Group A;
Ohnishi Ryuhei, Niu Eiko, Chen Qirui, Chen Yujian
Ohnishi Ryuhei(2 loss) is eliminated.
Chen Qirui(2 win) is advanced to round of 8.
Chen Yujian defeated Niu Eiko by resign and advanced to round of 8.

Group B;
Mutsumura Yuuta, Shin Jinseo, Ding Hao, Pongsakarn SORNARRA
Pongsakarn SORNARRA(2 loss) is eliminated.
Shin Jinseo(2 win) is advanced to round of 8.
Ding Hao defeated Mutsumura Yuuta by resign and advanced to round of 8.

Group C;
Hirose Yuichi, Wang Zejin, Shin Minjoon, Brandon Zhou
Brandon Zhou(2 loss) is eliminated.
Shin Minjoon(2 win) is advanced to round of 8.
Wang Zejin defeated Hirose Yuichi by resign and advanced to round of 8.

Group D;
Shibano Toramaru, Park Sangjin, Ueno Asami, Anton Chernykh
Anton Chernykh(2 loss) is eliminated.
Park Sangjin(2 win) is advanced to round of 8.
Shibano Toramaru defeated Ueno Asami by resign and advanced to round of 8.

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 Post subject: Re: 6th GLOBIS Cup
Post #4 Posted: Fri Apr 19, 2019 9:21 pm 
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4th round(round of 8);

Ding Hao defeated Chen Qirui by resign.
Shin Jinseo defeated Chen Yujian by resign.
Shin Minjoon defeated Shibano Toramaru by 3.5.
Wang Zejin defeated Park Sangjin by 2.5.


This post by trout was liked by: Uberdude
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 Post subject: Re: 6th GLOBIS Cup
Post #5 Posted: Sat Apr 20, 2019 8:56 pm 
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Semi-Final;
Shin Minjoon defeated Ding Hao by resign.
Wang Zejin defeated Shin Jinseo by resign.

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 Post subject: Re: 6th GLOBIS Cup
Post #6 Posted: Sat Apr 20, 2019 9:30 pm 
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trout wrote:
Semi-Final;
Shin Minjoon defeated Ding Hao by resign.
Wang Zejin defeated Shin Jinseo by resign.


Shin Jinseo is the favorite and he seems to like the Globis Cup U-20 tournament a lot - he has participated in the past 6 years but only won in 2017..

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 Post subject: Re: 6th GLOBIS Cup
Post #7 Posted: Sat Apr 20, 2019 10:27 pm 
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3rd, 4th place match;
Ding Hao defeated Shin Jinseo by resign.

Champion match;
Shin Minjoon defeated Wang Zejin by resign.

Shin Minjoon is Champion finally.
* He lost in the champion match last year.
Also this is his last chance.

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 Post subject: Re: 6th GLOBIS Cup
Post #8 Posted: Mon Apr 22, 2019 5:24 am 
Judan

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On his way to winning, Shin allowed his opponent to make a rarely-seen tortoise shell capture in the centre:

Click Here To Show Diagram Code
[go]$$Bc [2019-04-21] Ding Hao 5p (Black) vs. Shin Minjun 9p (White)
$$ +---------------------------------------+
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . O . . . . . |
$$ | . . . . . . . . . . . . . . . O O . . |
$$ | . . . O . . . . . , . . . . X X X . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . , . . . . . , . . . . . , . . . |
$$ | . . . . . . . . . . . . . . . . X . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . X X . . . . . . . . . . . . . |
$$ | . . . X . . X . . . . . . . . . . . . |
$$ | . . . . 1 X . . . . . . . . . . . . . |
$$ | . . . O . O X . . O . . . . . , . . . |
$$ | . . . . O . O . . . . . . . . X . . . |
$$ | . . . . . O . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ +---------------------------------------+[/go]


Unsurprisingly the territory and sente loving bots prefer white.

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 Post subject: Re: 6th GLOBIS Cup
Post #9 Posted: Mon Apr 22, 2019 2:38 pm 
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this is insane, how is w better here is beyond me...

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 Post subject: Re: 6th GLOBIS Cup
Post #10 Posted: Mon Apr 22, 2019 3:37 pm 
Judan

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Yes, quite interesting isn't it. This is the sort of position I'd expect Kageyama to say "This position is great for black, stare at it until you realise this is obviously true, if you can't understand this you shouldn't play go". I think I would probably prefer to take black because I am not as skilled as the bots at reduction, and also the bad aji at h3 worries me. If it white had managed to make the following exchange (there was no timing at which black would have allowed it) then white seems ok:
Click Here To Show Diagram Code
[go]$$Bc White happier
$$ +---------------------------------------+
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . O . . . . . |
$$ | . . . . . . . . . . . . . . . O O . . |
$$ | . . . O . . . . . , . . . . X X X . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . , . . . . . , . . . . . , . . . |
$$ | . . . . . . . . . . . . . . . . X . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . X X . . . . . . . . . . . . . |
$$ | . . . X . . X . . . . . . . . . . . . |
$$ | . . . . 1 X B . . . . . . . . . . . . |
$$ | . . . O . O X W . O . . . . . , . . . |
$$ | . . . . O . O . . . . . . . . X . . . |
$$ | . . . . . O . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ +---------------------------------------+[/go]


As it is, there is some interesting aji, thankfully for white he has this ladder (for now):
Click Here To Show Diagram Code
[go]$$Bc h3 aji
$$ +---------------------------------------+
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . O . . . . . |
$$ | . . . . . . . . . . . . . . . O O . . |
$$ | . . . O . . . . . , . . . . X X X . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . O . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . , . . . . . , . . . . . , . . . |
$$ | . . . . . . . . . . . . . . . . X . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . X X . . . . . . . . . . . . . |
$$ | . . . X . . X . 8 . . . . . . . . . . |
$$ | . . . . X X . 4 5 . . . . . . . . . . |
$$ | . . . O . O X 2 3 O . . . . . , . . . |
$$ | . . . . O . O 1 6 . . . . . . X . . . |
$$ | . . . . . O . 7 . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ +---------------------------------------+[/go]


So locally speaking we may get this and then fighting.
Click Here To Show Diagram Code
[go]$$Bc h3 aji
$$ +---------------------------------------+
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . O . . . . . |
$$ | . . . . . . . . . . . . . . . O O . . |
$$ | . . . O . . . . . , . . . . X X X . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . O . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . , . . . . . , . . . . . , . . . |
$$ | . . . . . . . . . . . . . . . . X . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . X X . . . . . . . . . . . . . |
$$ | . . . X . . X . . . . . . . . . . . . |
$$ | . . . . X X . 4 6 . . . . . . . . . . |
$$ | . . . O . O X 2 3 O . . . . . , . . . |
$$ | . . . . O . O 1 5 c a . . . . X . . . |
$$ | . . . . . O . . . . b . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ +---------------------------------------+[/go]


So can we do a count / positional judgement of the game position? Let's give white the big knight at top left as in game.
Click Here To Show Diagram Code
[go]$$Bc
$$ +---------------------------------------+
$$ | . . . . . . . . . . . . . . S S S S S |
$$ | . . . . . . . . . . . . . O . S S . . |
$$ | . . . . . . . . . . . . . . . O O . . |
$$ | . . . O . . . . . , . . . . X X X . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . O . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . , . . . . . , . . . . . , . . . |
$$ | . . . . . . . . . . . . . . . . X . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . X X . . . . . . . . . . . . . |
$$ | . . . X . . X . . . . . . . . . . . . |
$$ | . . . . X X . . . . . . . . . . . . . |
$$ | . . . O . O X . . O . . . . . , . . . |
$$ | . . . . O . O . . . . . . . . X . . . |
$$ | . . S S S O . . S . . . . . . . S S S |
$$ | . . S S S S . . S . . . . . . . S S S |
$$ +---------------------------------------+[/go]


In terms of confirmed territory, white top left is about 7 points (assuming white doesn't go for trades). How much is lower left? Looks like black 3-3 might be a ko so we can't count too much of the corner, and black b4 is a fairly easy reduction if you don't mind losing on the outside. But because of the ponnuki white is pretty lifey so many black moves are gote until endgame. Probably giving the b6 b4 exchange to ease counting is too generous to white as it doesn't build so much on the left side with white c13 there, but giving black b4 white c3 is generous to black. So hand-wavey I marked some territory, call it 8 points with the capture. Top left is still open with the big knight. Black's only confirmed territory is 4 points from the capture (only 1 eye if we are being super pedantic/paranoid) but let's give the 3-4 a bit of corner, say 6 points. So for confirmed territory black is 10 points, white is 7+8+6.5 = 21.5.

But how about potential? Top right each has 3 stones and is a joseki so let's give black 7 points of territory/potential for his wall to balance the white corner. It could become a weak group though as well as building right side moyo. r9 stone is what? As valuable as c13? And q3 as valuable as d16? Maybe let's just say they all cancel out. Then we just have tortoise vs ponnuki and k4.

How to value k4 and its effect on j3 area? Given the h3 aji it could become dame / black territory / a fight but it is probably slightly net positive for white (if white gets first move there white might get 10ish points which is more than if black first), let's call it 2 points average. How to value influence of the tortoise? Counting 2 lines out from a wall is an idea I've come across before, with weak walls it's overgenerous but seems reasonable here. So saying top right is even, top left 2 stones = bottom right 2 stones we end up with something like below (due to d4/k4 I didn't give black influence any value on line 6 or under):
Click Here To Show Diagram Code
[go]$$Bc
$$ +---------------------------------------+
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . O . . . . . |
$$ | . . . . . . . . . . . . . . . O O . . |
$$ | . . . O . . . . . , . . . . X X X . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . O . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . , . . . . . , . . . . . , . . . |
$$ | . . . . S S . . . . . . . . . . X . . |
$$ | . . S S S S S S . . . . . . . . . . . |
$$ | . . S S X X S S . . . . . . . . . . . |
$$ | . . . X S S X . . . . . . . . . . . . |
$$ | . . . . X X . . . . . . . . . . . . . |
$$ | . . . O . O X . . O . . . . . , . . . |
$$ | . . . . O S O . . . . . . . . X . . . |
$$ | . . S S S O . . S . . . . . . . . . . |
$$ | . . S S S S . . S . . . . . . . . . . |
$$ +---------------------------------------+[/go]


Here black has 12 "points" of influence and 4 territory = 16. White has 10+6.5 = 16.5. Huh, so close! (I didn't pick black influence points on purpose to arrange that, honest!). With 7.5 komi as bots have a little more for white (some LZ gave white 60%) Well, this approach has big error bars so I don't know if it really says much with accuracy, but thinking it through like this makes it clear to me white doesn't need to resign :) .

P.S. I forgot that in this position black has sente and didn't make any adjustment for that.


This post by Uberdude was liked by 2 people: Joaz Banbeck, Mapleleaf
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 Post subject: Re: 6th GLOBIS Cup
Post #11 Posted: Mon Apr 22, 2019 5:40 pm 
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In this position, I would still prefer black; and as the bots only give 60% win rate for white, this tournament I believe is in Japanese rules (6.5 points komi), so it is still quite balanced. Q5 I would probably play at N17 instead as in the game, black has spent a move to defend the lower right corner and white still got the corner after a fight. After white got most of upper left corner black does not have much territories

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