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Re: #264 Joaz Banbeck vs TegaiS
Posted: Wed Nov 02, 2016 12:55 am
by Joaz Banbeck
$$Bcm21
Click Here To Show Diagram Code [go]$$Bcm21
Re: #264 Joaz Banbeck vs TegaiS
Posted: Thu Nov 03, 2016 6:36 am
by TegaiS
$$Bcm21
Click Here To Show Diagram Code [go]$$Bcm21
C7 is big (about 30 points). Adding a stone to the running fight is urgent. Urgent before big. However it is very difficult to decide on a specific move. J13 looks dangerous but I couldn't find another move that could put enough pressure on black. The problem is the cut at L16. If I want to attack I can't sacrifice the K16 stone. At least J13 defends against the cut indirectly
$$Bcm21
Click Here To Show Diagram Code [go]$$Bcm21
Re: #264 Joaz Banbeck vs TegaiS
Posted: Thu Nov 03, 2016 1:01 pm
by Joaz Banbeck
$$Bcm21
Click Here To Show Diagram Code [go]$$Bcm21
He just made the center more urgent. If I tenuki to take profit in the lower left, one more move by him makes the center his.
I can't push at K15 right now. His most recent move limits my ability to extend away from that fight. But having F15 reinstates the threat to play K15.
$$Bcm21
Click Here To Show Diagram Code [go]$$Bcm21
I like my options here:
A) I can push through at K15.
B) I can try to attack his upper left corner with D14
C) I can kill his lower left corner
He can't stop all of them
And if things get really hairy, I can probably live on the upper side with 'd' and/or run with 'e'.
FWIW, I did consider G15, because it is tactically more solid:
$$Bcm21
Click Here To Show Diagram Code [go]$$Bcm21
...but it is smaller and more likely to leave me with a heavy group.
Staying light may matter a lot here.
Re: #264 Joaz Banbeck vs TegaiS
Posted: Thu Nov 03, 2016 4:34 pm
by Joaz Banbeck
@ observers, particularly beginners:
I present a sideline here, so that you all can appreciate the subtleties of judgement that must be made in this position. ( I'm not saying that TegaiS and I make these judgements correctly, merely that the circumstances compel us to try. )
The toe bone is connected to the footbone which is connected to...etc.
There are variations in the upper right in which black goes to the mattresses, not allowing white space for two eyes, thereby forcing white to seek life in the center or die trying.
I haven't memorized the variations, I only recall the general idea. I suspect that my opponent has memorized them - I can't imagine him playing this way otherwise. So if he has already shown this, please pardon me for the redundancy.
It starts like this, with black 2 and 4 fighting for eye space in the corner:
$$Wcm1
Click Here To Show Diagram Code [go]$$Wcm1
If black has some additional stones in the area - here arbitrarily placed at the circled spots - white dies.
So white must be careful about becoming too heavy in the center, or those circled stones - or some similarly placed black stones - will be played in sente attacking the center, and will later turn around and participate in killing his invasion in the upper right.
The converse of all of this is that white is waiting for the board to stabilize a bit so that he can play in the corner, leaving black with the unpleasant choice between letting white have the corner or run to friends in the center.
It follows, therefore, that black wants to keep the white stones in the center weak or at least of uncertain status.
A particular action toward this goal is playing K15. As long as black threatens to do that, the white invader at S16 is frozen.
In other words, the black stone that I just played at F15 affects the white stone at S16.
Posted: Thu Nov 03, 2016 6:47 pm
by EdLee
It starts like this, with black 2 and 4 fighting for eye space in the corner:
$$W
Click Here To Show Diagram Code [go]$$WThe above fight can quickly become very complicated.
Not easy for beginners.
Also, seems unlikely B had it in mind.
$$W
Click Here To Show Diagram Code [go]$$W
Re: #264 Joaz Banbeck vs TegaiS
Posted: Thu Nov 03, 2016 7:02 pm
by TegaiS
$$Bcm21
Click Here To Show Diagram Code [go]$$Bcm21
The cut works so I can't attack and go back to defense.
$$Bcm21
Click Here To Show Diagram Code [go]$$Bcm21
Probably
was a mistake. It helps my weak stones a little but now black can play D15.
Re: #264 Joaz Banbeck vs TegaiS
Posted: Thu Nov 03, 2016 7:19 pm
by Joaz Banbeck
$$Bcm21
Click Here To Show Diagram Code [go]$$Bcm21
This would be huge for white:
$$Bcm21
Click Here To Show Diagram Code [go]$$Bcm21
Re: #264 Joaz Banbeck vs TegaiS
Posted: Fri Nov 04, 2016 1:15 am
by The Intrepid
Fun game!
Re: #264 Joaz Banbeck vs TegaiS
Posted: Fri Nov 04, 2016 5:18 am
by TegaiS
$$Bcm21
Click Here To Show Diagram Code [go]$$Bcm21
I can't predict Joaz at all. The local situations in that game are so complicate that I can't read them to any satisfactory extent. The cut makes it even more complicate so I can hope that my opponent will not be able to read it out too. I can only see that the ladder is in white's favour.
After this the san-san invasion looks scary. And even if it doesn't work white corner looks miserably.
$$Bcm21
Click Here To Show Diagram Code [go]$$Bcm21
Here Black has D18. But my intuition says that Black has to care about
and
first. Black also has the loose ladder starting at F13. It doesn't work immediately but B15 seems to be the ladder breaker. Still I think this is better than the previous diagram.
$$Bcm21
Click Here To Show Diagram Code [go]$$Bcm21$$Bcm21
Click Here To Show Diagram Code [go]$$Bcm21
The other loose laddder also doesn't work.
$$Bcm21
Click Here To Show Diagram Code [go]$$Bcm21
Trigger:
$$Bcm21
Click Here To Show Diagram Code [go]$$Bcm21
Re: #264 Joaz Banbeck vs TegaiS
Posted: Fri Nov 04, 2016 8:56 am
by Joaz Banbeck
Well... my opponent certainly does not lack courage.
I have to accept his trigger and push through at 27. He then will complete the cut at 28.
My best play then is probably 29, and B16 is the shape move for both of us. He will almost certainly take it.
Trigger accepted.
$$Bcm21
Click Here To Show Diagram Code [go]$$Bcm21
If I try something like this, one of my groups dies.
$$Bcm21
Click Here To Show Diagram Code [go]$$Bcm21
Re: #264 Joaz Banbeck vs TegaiS
Posted: Fri Nov 04, 2016 7:11 pm
by TegaiS
$$Bcm21
Click Here To Show Diagram Code [go]$$Bcm21
Re: #264 Joaz Banbeck vs TegaiS
Posted: Sat Nov 05, 2016 9:41 am
by Joaz Banbeck
Once I play move 31 at F13, then the next handful of moves is forced. I'm including triggers so that I don't bore either opponent or observers.
$$Bcm31
Click Here To Show Diagram Code [go]$$Bcm31
Trigger: ( I'll play all or as much of this sequence as you wish)
$$Bcm31
Click Here To Show Diagram Code [go]$$Bcm31
@observers:
Life has been busy lately, and the time crunch is not helped by analyzing for hours.
I'll post more on move 31 later.
For right now, I'll mention that all of this makes sense if you keep in mind that black cannot allow white to play F14 in sente. Black has to restrict white's liberties, otherwise this happens:
$$Wcm1 If the net is too loose, white 3 becomes a killer
Click Here To Show Diagram Code [go]$$Wcm1 If the net is too loose, white 3 becomes a killer
In a day or two I hope to get back to the alternatives to move 31.
Re: #264 Joaz Banbeck vs TegaiS
Posted: Sat Nov 05, 2016 9:54 am
by Joaz Banbeck
Secondary triggers - if you play up to move 36, I'll play 37 as shown, then there are two triggers for the only two reasonable plays at move 38:
$$Bcm31 Move 38 at B14
Click Here To Show Diagram Code [go]$$Bcm31 Move 38 at B14$$Bcm33 Move 38 at C12
Click Here To Show Diagram Code [go]$$Bcm33 Move 38 at C12
@observers:
My goal here is to maintain the outside wall. He can have a big corner, but I'm going to have lots of influence and lots of sente plays.
As an example, if he chooses the first trigger - which I think is best for him - I'll finish the sequence with the circled stone. Then I'm all connected, and I'm looking at 'a', 'b', 'c', and 'd'.
$$Bcm31 Move 38 at B14
Click Here To Show Diagram Code [go]$$Bcm31 Move 38 at B14
Re: #264 Joaz Banbeck vs TegaiS
Posted: Mon Nov 07, 2016 2:33 am
by TegaiS
$$Bcm31 Move 38 at B14
Click Here To Show Diagram Code [go]$$Bcm31 Move 38 at B14
Re: #264 Joaz Banbeck vs TegaiS
Posted: Mon Nov 07, 2016 9:14 am
by Joaz Banbeck
$$Bcm41
Click Here To Show Diagram Code [go]$$Bcm41
was a mistake. It helps my weak stones a little but now black can play D15.
and 
first. Black also has the loose ladder starting at F13. It doesn't work immediately but B15 seems to be the ladder breaker. Still I think this is better than the previous diagram.
