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 Post subject: Re: Knotwilg's practice
Post #141 Posted: Tue Apr 02, 2019 11:08 am 
Honinbo

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Ian Butler wrote:
That was over quickly :D
Only a few days ago I explored the option of cutting like your opponent did at the 3-3 invasion. Don't feel like you can get a real good result, more of a trick move.


It has been played after the O-18 - N-18 exchange. :)

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 Post subject: Re: Knotwilg's practice
Post #142 Posted: Tue Apr 02, 2019 5:37 pm 
Judan

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Playing that cutting hane after attach and pull back is an AI joseki: http://www.alphago-games.com/view/event ... /1/move/15 (which has a detailed WeiqiTV video review). The idea is you want white to cut leading to liberty shortages / bad aji so you should hane early because if you do it after then 2nd line hane connect white might not cut but dodge. Here Ke Jie dodged anyway! http://ps.waltheri.net/database/game/76897/. In the British championship I played 2nd line first which was a slight mistake but it ended up reverting because Sam cut when I haned later anyway:



And here I dodged just to annoy Boris: viewtopic.php?f=48&t=13672&p=231966&hilit=boris#p231966


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 Post subject: Re: Knotwilg's practice
Post #143 Posted: Fri Apr 26, 2019 12:07 pm 
Oza
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Some time ago Ian asked "what is your weakness". After many games on Foxy I'd say, "picking fights when I'm ahead". I often get an early advantage, so when my opponent goes all out attacking, I engage instead of dodging. So this is now my challenge for the next 5 games: when ahead, reduce risk; offer the opponent to take a small gain and secure the lead.

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 Post subject: Re: Knotwilg's practice
Post #144 Posted: Sat Apr 27, 2019 1:20 pm 
Oza
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Knotwilg wrote:
Some time ago Ian asked "what is your weakness". After many games on Foxy I'd say, "picking fights when I'm ahead". I often get an early advantage, so when my opponent goes all out attacking, I engage instead of dodging. So this is now my challenge for the next 5 games: when ahead, reduce risk; offer the opponent to take a small gain and secure the lead.


Well, I won all 5 games. In 2 of them the opponent resigned after the early advantage. In the others I think I fared well in playing solidly and securing the win.

Foxy 3d probably still is below my level. I'll next play a few games as 2d on KGS and review them with LZ to see where I need improvement.

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 Post subject: Re: Knotwilg's practice
Post #145 Posted: Fri May 10, 2019 4:01 pm 
Oza
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In the light of "modern endgame theory", how does it work in practice?

Here's a game of mine that ended in 2,5 for White (actually the opponent lost on time) but if I play what I think is ideal endgame from 204 onwards, is a half pointer.

I've done my endgame analysis but had to fall back on what I think is deiri - traditional theory.

At 204 there are moves A-H. What's their value?


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 Post subject: Re: Knotwilg's practice
Post #146 Posted: Fri May 10, 2019 4:04 pm 
Oza
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Click Here To Show Diagram Code
[go]$$ Position at move 204
$$ ---------------------------------------
$$ | . . . . h . . . . . . . . . . . . . . |
$$ | . . . X . O X O . . . . X O . a . . . |
$$ | . . X O O O X O O O O . . . O O X . . |
$$ | . . X X O X O O X O X O O O X , X . . |
$$ | . . . X X X X X X O X O X X X . . . . |
$$ | . . O O O X . g O X X X O . . . X . . |
$$ | . . . . X O X X O X O X O O O O X . . |
$$ | . O . X f O O O O X . O O X X O O b . |
$$ | . X . X O . . . . . O O X . X X O . . |
$$ | . X . X e . . . O d O X X X X O O . . |
$$ | . X O . O . . . O X X X O . X X X X . |
$$ | . X O . O . . O X O . . c . . . X . X |
$$ | . . X O . . . O X . O X . O . X O X . |
$$ | . X . X O . . O O X . . . . O O O O . |
$$ | . O . . . . O O X O O O O O X X X O . |
$$ | . . O O O . X O X X O X O X . , . X . |
$$ | . X X X O X . O X . X . X X . X X X . |
$$ | . O O O X . X X . X X X . O X . . . . |
$$ | . . . . . X . . X . . . . . . X . . . |
$$ ---------------------------------------[/go]

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 Post subject: Re: Knotwilg's practice
Post #147 Posted: Sat May 11, 2019 4:12 am 
Oza
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Lizzie's analysis:

Click Here To Show Diagram Code
[go]$$ Position at move 204
$$ ---------------------------------------
$$ | . . . . h . . . . . . . . . . . . . . |
$$ | . . . X . O X O . . . . X O . a . . . |
$$ | . . X O O O X O O O O . . . O O X . . |
$$ | . . X X O X O O X O X O O O X , X . . |
$$ | . . . X X X X X X O X O X X X . . . . |
$$ | . . O O O X . g O X X X O . . . X . . |
$$ | . . . . X O X X O X O X O O O O X . . |
$$ | . O . X f O O O O X . O O X X O O b . |
$$ | . X . X O . . . . . O O X . X X O . . |
$$ | . X . X e . . . O d O X X X X O O . . |
$$ | . X O . O . . . O X X X O . X X X X . |
$$ | . X O . O . . O X O . . c . . . X . X |
$$ | . . X O . . . O X . O X . O . X O X . |
$$ | z X . X O . . O O X . . . . O O O O . |
$$ | . O . . . . O O X O O O O O X X X O . |
$$ | . . O O O x X O X X O X O X . , . X . |
$$ | . X X X O X . O X . X . X X . X X X . |
$$ | . O O O X . X X . X X X . O X . . . . |
$$ | . . . y . X . . X . . . . . . X . . . |
$$ ---------------------------------------[/go]


LZ definitely sees A as the biggest move, not only for Black but also for White. The hane to the right of A is also considered sente by LZ, as Black will respond up to S19 but A itself is more clearly sente

So much even that moves like E or F are not sente for Black in the global sense. White will play A in sente and grab a few capital points there.
D is obviously Black sente and as such incidental to the game
F is White sente

LZ agrees that B and C are the next big gote and will play either of them early, but definitely after A
G is on LZ's radar but not as an early move
H is incidental to the game, as it is sente for 0 points and then can make 1 point

In the bottom left corner, there are some border plays I missed

X - White gains a point there and threatens to capture a stone with a ko follower; Black can forestall this, threatening to enter WHite's territory but not in a big way
Y - is bigger than it may seem; if unanswered, Black can force a capture that loses 6 points compared to White playing 2 herself; if answered, White saves 3 of those points, so 2) is a 3 point sente for Black / 6 point gote
Z - if Black plays there, he makes two points; White playing 3 protects some points in the corner AND sets up a throw-in that gets 3 more points

Click Here To Show Diagram Code
[go]$$B Moves 205 to 214
$$ ---------------------------------------
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . X . O X O . . . . X O 2 1 3 . . |
$$ | . . X O O O X O O O O . . . O O X . . |
$$ | . . X X O X O O X O X O O O X , X . . |
$$ | . . . X X X X X X O X O X X X . . . . |
$$ | . . O O O X . . O X X X O . . . X 7 . |
$$ | . . . . X O X X O X O X O O O O X 6 . |
$$ | . O . X . O O O O X . O O X X O O 8 . |
$$ | . X . X O . . . . . O O X . X X O . . |
$$ | . X . X . . . . O , O X X X X O O . . |
$$ | . X O . O . . . O X X X O . X X X X . |
$$ | . X O . O . . O X O . 5 4 . . . X . X |
$$ | . . X O . . . O X . O X . O . X O X . |
$$ | . X . X O . . O O X . . . . O O O O . |
$$ | . O . . . 0 O O X O O O O O X X X O . |
$$ | . . O O O 9 X O X X O X O X . , . X . |
$$ | . X X X O X . O X . X . X X . X X X . |
$$ | . O O O X . X X . X X X . O X . . . . |
$$ | . . . . . X . . X . . . . . . X . . . |
$$ ---------------------------------------[/go]


In LZ's continuation, :w4: is sente and so White grabs :w6: too.

Click Here To Show Diagram Code
[go]$$B Moves 215 to 224
$$ ---------------------------------------
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . X . O X O . . . . X O O X X . . |
$$ | . . X O O O X O O O O . . . O O X . . |
$$ | . . X X O X O O X O X O O O X , X . . |
$$ | . . . X X X X X X O X O X X X . . . 9 |
$$ | . . O O O X . . O X X X O . . . X X 8 |
$$ | . . . 3 X O X X O X O X O O O O X O 0 |
$$ | . O . X 2 O O O O X . O O X X O O O . |
$$ | . X . X O . . . . . O O X . X X O . . |
$$ | . X . X 1 4 . . O , O X X X X O O . . |
$$ | . X O . O . . . O X X X O . X X X X . |
$$ | . X O . O . . O X O . X O . . . X . X |
$$ | . . X O . . . O X . O X . O . X O X . |
$$ | 7 X . X O . . O O X . . . . O O O O . |
$$ | . O . . . O O O X O O O O O X X X O . |
$$ | . 6 O O O X X O X X O X O X . , . X . |
$$ | . X X X O X . O X . X . X X . X X X . |
$$ | . O O O X . X X . X X X . O X . . . . |
$$ | . . . 5 . X . . X . . . . . . X . . . |
$$ ---------------------------------------[/go]


Both grab central sente, then the Y and Z moves in the corner are executed. Next, White executes the sente follower in the upper right
Click Here To Show Diagram Code
[go]$$B Moves 225 to 233
$$ ---------------------------------------
$$ | . . . . 7 . 8 . . . . . . . . a . . . |
$$ | . . 5 X 4 O X O . . . . X O O X X . . |
$$ | . . X O O O X O O O O . . . O O X . . |
$$ | . . X X O X O O X O X O O O X , X . . |
$$ | . . . X X X X X X O X O X X X . . 1 X |
$$ | . . O O O X 9 6 O X X X O . . b X X O |
$$ | . . . X X O X X O X O X O O O O X O O |
$$ | . O . X O O O O O X . O O X X O O O . |
$$ | . X . X O . . . . . O O X . X X O . . |
$$ | . X h X X O . . O i O X X X X O O 3 . |
$$ | . X O g O . . . O X X X O . X X X X . |
$$ | . X O . O . . O X O . X O . c . X . X |
$$ | . . X O . . . O X . O X . O . X O X . |
$$ | X X . X O . . O O X . d . . O O O O . |
$$ | . O . f . O O O X O O O O O X X X O . |
$$ | . O O O O X X O X X O X O X . , . X . |
$$ | . X X X O X . O X . X . X X . X X X . |
$$ | . O O O X . X X . X X X . O X . . . . |
$$ | . . 2 X e X . . X . . . . . . X . . . |
$$ ---------------------------------------[/go]

Small endgame remains and the game is very tight

A - 2 gote with some aji for White
B - 1 gote with 1 sente follower for White
C - 1 gote with 3 gote follower for white
D - 1 sente Black
E - ko with ko follower
F - 1 gote with major follower, so probably 1 sente White
G - 1 sente Black
H - 1 sente White
I - 1 sente Black

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 Post subject: Re: Knotwilg's practice
Post #148 Posted: Sat May 11, 2019 5:08 am 
Gosei

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I have gained a lot of endgame points with Y over the years! Those three stones (after you extend) that are left behind after the 3-3-invasion-double-hane joseki have a lot of subtle uses that players (at least at my level) often undervalue.

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 Post subject: Re: Knotwilg's practice
Post #149 Posted: Sat May 11, 2019 8:18 am 
Honinbo

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Top of the head point. In the last diagram :w4: should be at 7. Which means that :b3: should also be at 7. :)

Edit: My bad. Off the top of my head I thought that the top left was a Black sente, but it is a White sente. See later note.

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Visualize whirled peas.

Everything with love. Stay safe.


Last edited by Bill Spight on Sat May 11, 2019 2:16 pm, edited 1 time in total.
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 Post subject: Re: Knotwilg's practice
Post #150 Posted: Sat May 11, 2019 11:06 am 
Oza
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I took this game as the sample game for "Practical Endgame"

https://senseis.xmp.net/?DieterVerhofst ... calEndgame

Bill, I'm not sure about your analysis. That move seems totally incidental to the game?

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 Post subject: Re: Knotwilg's practice
Post #151 Posted: Sat May 11, 2019 1:20 pm 
Honinbo

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Top left play.

My bad. This position is a White sente. :)

Click Here To Show Diagram Code
[go]$$W White sente
$$ -----------------------
$$ | . C 4 . 1 . 3 C . . .
$$ | . C C X 2 O B O . . .
$$ | . . X O O O B O O O O
$$ | . . X X O X O O X O X
$$ | . . . X X X X X X O X
$$ | . . O O O X . . O X X
$$ | . . . . X O X X O X O
$$ | . O . X . O O O O X .
$$ | . X . X O . . . . . O
$$ | . X . X . . . . O . O[/go]


Local result: -2.

Click Here To Show Diagram Code
[go]$$W White's threat
$$ -----------------------
$$ | . 6 5 7 1 C C C . . .
$$ | . 4 3 B C O B O . . .
$$ | . . X O O O B O O O O
$$ | . . X X O X O O X O X
$$ | . . . X X X X X X O X
$$ | . . O O O X . . O X X
$$ | . . . . X O X X O X O
$$ | . O . X . O O O O X .
$$ | . X . X O . . . . . O
$$ | . X . X . . . . O . O[/go]


Local result: -10. White gains 8 pts. in 2 net plays.

Click Here To Show Diagram Code
[go]$$B Black reverse sente
$$ -----------------------
$$ | . C C C 1 . 2 C . . .
$$ | . C . X 3 O B O . . .
$$ | . . X O O O B O O O O
$$ | . . X X O X O O X O X
$$ | . . . X X X X X X O X
$$ | . . O O O X . . O X X
$$ | . . . . X O X X O X O
$$ | . O . X . O O O O X .
$$ | . X . X O . . . . . O
$$ | . X . X . . . . O . O[/go]


Local result: -1.

The reverse sente gains 1 pt.

----

Edit: Alternate White sente.

Click Here To Show Diagram Code
[go]$$W White sente
$$ -----------------------
$$ | . C C . 2 . 3 C . . .
$$ | . C 4 X 1 O B O . . .
$$ | . . X O O O B O O O O
$$ | . . X X O X O O X O X
$$ | . . . X X X X X X O X
$$ | . . O O O X . . O X X
$$ | . . . . X O X X O X O
$$ | . O . X . O O O O X .
$$ | . X . X O . . . . . O
$$ | . X . X . . . . O . O[/go]


Local result: -2.

This way is not as good for White in terms of ko threats.

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Last edited by Bill Spight on Sat May 11, 2019 2:26 pm, edited 1 time in total.
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 Post subject: Re: Knotwilg's practice
Post #152 Posted: Sat May 11, 2019 2:22 pm 
Oza
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Thanks Bill!

I saw it as a 1 reverse sente for Black indeed.

With the bad aji Black has in that corner, he'd probably best leave that position alone and for example first secure his second eye, which is also a White sente I believe (1 point threatening 4 more).

So not urgent, on the contrary. Correct?

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 Post subject: Re: Knotwilg's practice
Post #153 Posted: Sat May 11, 2019 3:01 pm 
Honinbo

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Knotwilg wrote:
Thanks Bill!

I saw it as a 1 reverse sente for Black indeed.

With the bad aji Black has in that corner, he'd probably best leave that position alone and for example first secure his second eye, which is also a White sente I believe (1 point threatening 4 more).

So not urgent, on the contrary. Correct?


Considering the aji I am not at all sure that those plays are independent. If not, then the calculations are all wrong and the urgency is high. Which is how the humans played it. However, top bots are sensitive to aji and LZ plays them as though they were independent. {shrug}

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 Post subject: Re: Knotwilg's practice
Post #154 Posted: Sun Nov 17, 2019 5:53 am 
Oza
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Analyzing a fairly easy win. What did I think during the game? What does LZ think?


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 Post subject: Re: Knotwilg's practice
Post #155 Posted: Mon Nov 25, 2019 9:28 am 
Oza
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I analyzed three recent games of mine (KGS 1d level) with Lizzie (LZ/Kata) to find my biggest mistakes and learn from them.

- take the big point
- surround
- take the shape point (4)
- attack to make profit instead of loosely surrounding without profit
- play the double sente / look out for killing moves
- play away from strength to attack strongly
- don't fall for the trick play (don't think: what are you doing, stupid opponent!)
- don't invite your opponent to make good shape
- play the tesuji to capture one of either groups

Shape gets particular attention.

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 Post subject: Re: Knotwilg's practice
Post #156 Posted: Wed Nov 27, 2019 12:47 pm 
Oza
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I learnt about this particular shape, not only in this game, but through multiple AI game reviews.

I hope I will unlearn the move that forces my opponent into good shape and learn the move(s) that turn him into bad shape.

https://senseis.xmp.net/?ShapeProblem7%2FSolution

Please review for errors.

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 Post subject: Re: Knotwilg's practice
Post #157 Posted: Wed Nov 27, 2019 1:44 pm 
Honinbo

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Nice trap. :)

But the last two diagrams don't make sense.

Also:

Click Here To Show Diagram Code
[go]$$Wc Easy life
$$ ---------------------------------------
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . X . . X . . . O . . . . . . |
$$ | . . . X . . . . . , . . . . . O . . . |
$$ | . . . . . . . . . . . . . . . . O . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . X , . . . . . , . . . . . . O . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . X . . . . . . . . . . . . . . . . . |
$$ | X X O . . . . . . . . . . . . . . . . |
$$ | X O X . . . . . . . . . . . . . . . . |
$$ | . O X a . . . . . . . . . . . . . . . |
$$ | O b O X X . . . . X . . . . . O . . . |
$$ | C O O O X . . . . . . . . O . . . . . |
$$ | 1 B . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ ---------------------------------------[/go]


It may not be best play, but :w1: makes easy life. :)

Also, I am unsure about eliminating the White cut at a. And in some variations, White loses a play and a dame by filling at b.

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Visualize whirled peas.

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 Post subject: Re: Knotwilg's practice
Post #158 Posted: Wed Nov 27, 2019 3:08 pm 
Lives in gote

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Bill Spight wrote:
...the last two diagrams don't make sense...

I've just edited the last diagram -- I think the move numbers were in the wrong order -- is it any better now? I didn't have any issues with the penultimate diagram myself.

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 Post subject: Re: Knotwilg's practice
Post #159 Posted: Wed Nov 27, 2019 4:23 pm 
Honinbo

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xela wrote:
Bill Spight wrote:
...the last two diagrams don't make sense...

I've just edited the last diagram -- I think the move numbers were in the wrong order -- is it any better now? I didn't have any issues with the penultimate diagram myself.


The penultimate diagram doesn't make go sense to me.

Click Here To Show Diagram Code
[go]$$W Wrong: forcing Black into good shape
$$ ---------------------------------------
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . X . . X . . . O . . . . . . |
$$ | . . . X . . . . . , . . . . . O . . . |
$$ | . . . . . . . . . . . . . . . . O . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . X , . . . . . , . . . . . . O . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . X . . . . . . . . . . . . . . . . . |
$$ | X X O 1 . . . . . . . . . . . . . . . |
$$ | X O X . 2 . . . . . . . . . . . . . . |
$$ | 4 O X . . . . . . . . . . . . . . . . |
$$ | O 5 O X X . . . . X . . . . . O . . . |
$$ | . O O O X . . . . . . . . O . . . . . |
$$ | 8 X . 7 3 6 . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ ---------------------------------------[/go]


:w1: - :b2: is a given. But :b4:? Really? Surely it should be at 6. Certainly. :w5: is bad. I think something like this may have been intended.

Click Here To Show Diagram Code
[go]$$W Wrong: forcing Black into good shape
$$ ---------------------------------------
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . X . . X . . . O . . . . . . |
$$ | . . . X . . . . . , . . . . . O . . . |
$$ | . . . . . . . . . . . . . . . . O . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . X , . . . . . , . . . . . . O . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . X . . . . . . . . . . . . . . . . . |
$$ | X X O 1 . . . . . . . . . . . . . . . |
$$ | X O X . 2 . . . . . . . . . . . . . . |
$$ | 6 O X . . . . . . . . . . . . . . . . |
$$ | O 7 O X X . . . . X . . . . . O . . . |
$$ | . O O O X . . . . . . . . O . . . . . |
$$ | 8 X . 5 3 4 . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ --------------------------------------[/go]


But if so, :w7: could be at 8, for easy life. So:

Click Here To Show Diagram Code
[go]$$W Wrong: forcing Black into good shape
$$ ---------------------------------------
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . X . . X . . . O . . . . . . |
$$ | . . . X . . . . . , . . . . . O . . . |
$$ | . . . . . . . . . . . . . . . . O . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . X , . . . . . , . . . . . . O . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . X . . . . . . . . . . . . . . . . . |
$$ | X X O 1 . . . . . . . . . . . . . . . |
$$ | X O X . 2 . . . . . . . . . . . . . . |
$$ | . O X . . . . . . . . . . . . . . . . |
$$ | O . O X X . . . . X . . . . . O . . . |
$$ | . O O O X . . . . . . . . O . . . . . |
$$ | 6 X . 5 3 4 . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ --------------------------------------[/go]


This makes more sense to me. :) OC, :w5: could still be at 6.

_________________
The Adkins Principle:
At some point, doesn't thinking have to go on?
— Winona Adkins

Visualize whirled peas.

Everything with love. Stay safe.


This post by Bill Spight was liked by: Knotwilg
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 Post subject: Re: Knotwilg's practice
Post #160 Posted: Thu Apr 09, 2020 12:28 am 
Oza
User avatar

Posts: 2404
Location: Ghent, Belgium
Liked others: 359
Was liked: 1019
Rank: KGS 2d OGS 1d Fox 4d
KGS: Artevelde
OGS: Knotwilg
Online playing schedule: UTC 18:00 - 22:00
I've been playing many online games since the Corona crisis started, mostly on KGS.

What I try is:

- apply Dwyrin's "basic" style
- which includes avoiding fights unless the opponent is doing something unreasonable ("kills himself" in Dwyrin's words)
- instead play the big points and keep a mental model of where they are
- always think of 3 alternatives
- use my time (and the opponent's)

What most often happens:

- I get into a whole board fight, with unclear outcome
- I play intuitively and fast

Keeping the discipline to "stay calm and think" is not easy.


This post by Knotwilg was liked by: xela
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