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 Post subject: Re: 77: robinz[12k] v. DIV[12k]
Post #21 Posted: Tue Oct 12, 2010 4:21 am 
Dies with sente
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Robinz this is my last move for tonight(it's 4:15), but I should be on tomorrow to respond when I wake up, and later in the night for me as well. I do start work some time soon, which may encroach on my late nights which I think are your mid-morning/afternoons, but I'll play as much as I can. Also, you and Topaz are both English...I have my eye on you sneaky brits.

Click Here To Show Diagram Code
[go]$$Bcm15 robinz vs DIV - Move 15
$$ ---------------------------------------
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . X O . X . . . . . . . . X . . . . |
$$ | . . 1 O . . . . . , . . . . . , X . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . O . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . , . . . . . , . . . . . , . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . X . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . O . . . . . , . . . . . X . . . |
$$ | . . . . . . . . . . O . . O . . X . . |
$$ | . . . . . . . . . . . . . . . O . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ ---------------------------------------[/go]

Ok, the more i think about this the less happy I am, should take more time with my moves, I think this is probably not joseki, though maybe close...not sure the difference but probably has to do with his keima...bleh, here i am, here I go...

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 Post subject: Re: 77: robinz[12k] v. DIV[12k]
Post #22 Posted: Tue Oct 12, 2010 4:32 am 
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KGS: robinz
No problem - 2 or 3 moves a day is probably as much as I'd usually want to manage anyway. Most of moves will probably take me a while anyway, I'm quite a slow player anyway, with the only exception being the first few moves, because I usually know at least roughly what I'm doing then :)

No move yet, but some thoughts:

I know I just said I was going to play C18, but on second thoughts that doesn't necessarily seem so good - after he blocks at B18 I then have to defend the C18 stone, so unless he needs another move to live there's no point in me playing there now and I should take one of the several big points elsewhere on the board. Another thought that just occurs to me is that he could play to try to break out of the corner at both D15 and D18, in which case my D16/17 stones suddenly look very vulnerable. So I'm going to need to do some reading here - going to have some lunch now, and hopefully return with a move later.

(By then they're doubtless be lots of hidden posts saying "it's obvious, there's only one move here" - if so, that's very probably true, but unlike the rest of you I haven't seen this position often enough to know instantly what the right thing is to do.)

- Edited because my co-ordinates were all wrong.


Last edited by robinz on Tue Oct 12, 2010 4:49 am, edited 1 time in total.
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 Post subject: Re: 77: robinz[12k] v. DIV[12k]
Post #23 Posted: Tue Oct 12, 2010 4:41 am 
Tengen
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This sequences isn't much different to previous ones I've posted, but White gets slightly thicker and Black is slightly smaller in the corner:

Click Here To Show Diagram Code
[go]$$Bcm15 robinz vs DIV - Move 15
$$ ---------------------------------------
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . 5 3 4 . . . . . . . . . . . . . . |
$$ | . . X O 6 X . . . . . . . . X . . . . |
$$ | . 9 1 O . 0 . . . , . . . . . , X . . |
$$ | . 7 2 . . . . . . . . . . . . . . . . |
$$ | . 8 O . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . , . . . . . , . . . . . , . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . X . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . O . . . . . , . . . . . X . . . |
$$ | . . . . . . . . . . O . . O . . X . . |
$$ | . . . . . . . . . . . . . . . O . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ ---------------------------------------[/go]


Some useful further reading on Black's corner: http://senseis.xmp.net/?L2Group

Also, some further interesting variations. The solid connection at :b23: is considered normally better than the hanging connection because of the following:

Click Here To Show Diagram Code
[go]$$Wcm1 robinz vs DIV - later endgame ..
$$ ---------------------------------------
$$ | 6 . . . . . . . . . . . . . . . . . . |
$$ | 1 4 X X O . . . . . . . . . . . . . . |
$$ | 2 . X O O X . . . . . . . . X . . . . |
$$ | X 5 X O . O . . . , . . . . . , X . . |
$$ | 7 X O . . . . . . . . . . . . . . . . |
$$ | 3 O O . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . , . . . . . , . . . . . , . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . X . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . O . . . . . , . . . . . X . . . |
$$ | . . . . . . . . . . O . . O . . X . . |
$$ | . . . . . . . . . . . . . . . O . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ ---------------------------------------[/go]


It's gote, and not that huge (though White can take :w3: in sente and leave :w5: for later - it's still useful to play to there for the left hand side), but big enough that the solid connection is better in most cases...

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 Post subject: Re: 77: robinz[12k] v. DIV[12k]
Post #24 Posted: Tue Oct 12, 2010 6:12 am 
Lives in gote

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KGS: robinz
Click Here To Show Diagram Code
[go]$$Wcm16 robinz vs DIV - Move 16
$$ ---------------------------------------
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . 1 . . . . . . . . . . . . . . . . |
$$ | . . X O . X . . . . . . . . X . . . . |
$$ | . . X O . . . . . , . . . . . , X . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . O . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . , . . . . . , . . . . . , . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . X . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . O . . . . . , . . . . . X . . . |
$$ | . . . . . . . . . . O . . O . . X . . |
$$ | . . . . . . . . . . . . . . . O . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ ---------------------------------------[/go]


OK, I'm going with my first instinct. I can't be sure my reading is correct (I know reading is one aspect of the game I definitely need to work on, and I'm trying to be "honest" with this game and not actually play out hypothetical sequences on the board or make lots of diagrams purely to help me see possible future positions), but I think my concerns were unfounded. Firstly, I'm sure this is in fact sente, for after:
Click Here To Show Diagram Code
[go]$$W robinz vs DIV - Move 16
$$ ---------------------------------------
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . 2 1 3 . . . . . . . . . . . . . . . |
$$ | . . X O . X . . . . . . . . X . . . . |
$$ | . . X O . . . . . , . . . . . , X . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . O . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . , . . . . . , . . . . . , . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . X . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . O . . . . . , . . . . . X . . . |
$$ | . . . . . . . . . . O . . O . . X . . |
$$ | . . . . . . . . . . . . . . . O . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ ---------------------------------------[/go]

I'm sure that B19 will kill the corner if black tenukis.

Secondly, while there are a lot of lines and things get a bit beyond my reading ability, I think I have plenty of chances - later, if not now - to threaten the life of the corner even after black plays another move (B19 seems most likely). There certainly isn't much eyespace there - the only thing I have to watch is that my enclosing groups don't get too short on liberties (something I have often gone wrong in before when trying a bit too hard to kill things!).

Finally, I mentioned that I was a bit worried about black playing at D15. But, after the hane-connect sequence, I've still got 5 liberties, and what is more, after cutting at C15 I am threatening to capture the D15 stone in a ladder towards the bottom-right, which at the moment is in my favour (clearly something to watch as the situation develops, though). And if black saves that stone then I can definitely move on to kill the corner outright. (It might become a capturing race in which black has an eye and I don't, but even then I think I have so many more liberties that I still win it easily.)

My opponent also has the following sequence to cut (say from the position above, although it could be played now as well):

Click Here To Show Diagram Code
[go]$$B robinz vs DIV - Move 16
$$ ---------------------------------------
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . X O O . . . . . . . . . . . . . . . |
$$ | . . X O . X . . . . . . . . X . . . . |
$$ | . . X O . . . . . , . . . . . , X . . |
$$ | . . 1 2 . . . . . . . . . . . . . . . |
$$ | . . O 3 . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . , . . . . . , . . . . . , . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . X . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . O . . . . . , . . . . . X . . . |
$$ | . . . . . . . . . . O . . O . . X . . |
$$ | . . . . . . . . . . . . . . . O . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ ---------------------------------------[/go]

- it's a bit beyond my reading ability (without cheating) to see exactly what happens here, but his group still seems to be in enough trouble that I should be able to get something favorable out of it.

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 Post subject: Re: 77: robinz[12k] v. DIV[12k]
Post #25 Posted: Wed Oct 13, 2010 1:49 am 
Dies with sente
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Ok, had kind of a busy day. And was going to this morning before i got busier...but, I don't know right now. I need to do some good thinkin and less drinkin. I might move later on this evening. But it might wait until tomorrow. Here are some thoughts though:
Alright, I feel like I was overplaying with this invasion at this point, though I am almost glad he made this move instead of coming up at me below. This might be too tough for me to fight out, I am not sure. I have thought about some other moves that could be beneficial. Here are some of the potential options I have been thinking of, in no particular order.
Click Here To Show Diagram Code
[go]$$Wcm16 robinz vs DIV - Move 16
$$ ---------------------------------------
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . a 1 n . . . . . . . . . . . . . . . |
$$ | . . X O . X . . d . . e . . X . . . . |
$$ | . . X O . . . m . , . . . . . , X . . |
$$ | . . f c . . . . . . . . . . . . . . . |
$$ | . b O . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . , . . . . . , . . . . . , . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . g l . . . . . . . . . . . . X . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . O . h . . . , . . . . . X . . . |
$$ | . . j . . i k . . . O . . O . . X . . |
$$ | . . . . . . . . . . . . . . . O . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ ---------------------------------------[/go]
Some of these seem much better than other's obviously. I am just undecided about this fight in the top left after moving in too far.

here is something I might try:

Click Here To Show Diagram Code
[go]$$Bcm17 robinz vs DIV - Move 16
$$ ---------------------------------------
$$ | . . . 4 . . . . . . . . . . . . . . . |
$$ | . 3 O 1 2 . . . . . . . . . . . . . . |
$$ | . . X O . X . . . . . . . . X . . . . |
$$ | . . X O . . . . . , . . . . . , X . . |
$$ | . a b . . . . . . . . . . . . . . . . |
$$ | . 5 O . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . , . . . . . , . . . . . , . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . X . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . O . . . . . , . . . . . X . . . |
$$ | . . . . . . . . . . O . . O . . X . . |
$$ | . . . . . . . . . . . . . . . O . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ ---------------------------------------[/go]

a and b are potential miai for me to either escape or play low. Or so I think. So I will probably try this move.

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 Post subject: Re: 77: robinz[12k] v. DIV[12k]
Post #26 Posted: Thu Oct 14, 2010 2:46 am 
Lives in gote

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I guess yesterday/today wasn't very good for you either. No problem if so, but looking forward to resuming soon. Meanwhile, for the audience (if we still have one), some more of my thoughts:

I'm not sure why DIV hasn't posted a move yet, to be honest - I've come to the conclusion that the following sequence is more or less forced for black (it helps that, when going through some games of mine I played last month, I found the same corner situation, with me on the other side - although I'd left it until much later in the game):

Click Here To Show Diagram Code
[go]$$Bc
$$ ---------------------------------------
$$ | . 3 . . . . . . . . . . . . . . . . . |
$$ | . 1 O 2 . . . . . . . . . . . . . . . |
$$ | . . X O . X . . . . . . . . X . . . . |
$$ | . . X O . . . . . , . . . . . , X . . |
$$ | . 5 4 . . . . . . . . . . . . . . . . |
$$ | . . O . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . , . . . . . , . . . . . , . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . X . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . O . . . . . , . . . . . X . . . |
$$ | . . . . . . . . . . O . . O . . X . . |
$$ | . . . . . . . . . . . . . . . O . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ ---------------------------------------[/go]


- Black is now definitely alive, but making very few points, and meanwhile I have sente. Indeed, I can (and my opponent did in that earlier game I found) play a further forcing move against the corner at B14 - but surely the loss of a ko threat there is much more important than the potential extra point or two, so I'm not going to play it but finally take a big point elsewhere. I'm still looking at wanting to build up the left-hand side (with a play somewhere near the star point) and the bottom (at or near near G4), as well as a wedge in my opponent's right-hand side at R11 - but right now I feel (with my no doubt haywire DDK intuition ;-) ) that the biggest move will be a pincer on my opponent's F17 stone. The reason I feel this is biggest right now is that, if my opponent gets in a move in that area, they will have a base for that stone, as well as potentially quite a lot of points along the top in general (although some weaknesses will still remain). This in turn will severely blunt the effectiveness of my D16/17/18 wall. On the other hand, if I get a move in at about J16 (I don't actually know which pincer will be best, but as I type I think this is the point I'm most likely to play at - I don't want to play too close to my wall, and I feel a high pincer will be better placed for attack than a low one), then his stone will have no base and will come under some kind of attack - he's forced to run out, and I hope to make some territory on the top or left while putting pressure on it - and my wall looks a whole lot more effective. Precisely what happens I don't know (and it will depend a lot on how my opponent handles it), but I ought to be able to get some benefit, and perhaps even end in sente to play somewhere else. If so, I feel very happy about what's happening, and that my opponent's choice to invade the corner was a big mistake :D

To go back a bit, I said "more or less forced" about the above sequence, but black could instead try to play at C15 instead of either 1 or 3. The natural response is at D15, but then black will go back and play the sequence in the the diagram, where the C15/D15 exchange is very good for Black - a bigger corner, and with the possibility, whether now or later, of the cut at D14. So it will probably be best for me, if Black does play C15, to call his bluff by playing B17, completely removing all eyespace in the corner, but allowing him to run away at D15. I'm sure that Black being on the run with no eyes can't be good for him, but if it happens it remains to be seen how well I can handle it.

Incidentally - and I promise I'm not saying this merely to curry favour with our one observer so far :razz: - but last night I decided to watch some of topazg's videos (which may well have contributed to some of the thoughts I've put down above, as well), and have found that he's not a fan of the slide I played in the bottom-right when I have played the 4-4 in the bottom-left. Oh well, I guess I know what his earlier comments were about now then :D (I can see his point, and of course defer to his vastly greater knowledge of the game than mine, but I'm not sure it can really be called a big mistake at this stage, and certainly not in a game between two 12ks.)

Sorry all for the huge wall of text - but I'm assuming the above will save me from having to type much explanation for my next 3 or 4 moves at least. Unless my opponent does something crazy and unexpected, of course...


Last edited by robinz on Thu Oct 14, 2010 3:07 am, edited 1 time in total.
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 Post subject: Re: 77: robinz[12k] v. DIV[12k]
Post #27 Posted: Thu Oct 14, 2010 2:56 am 
Tengen
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Hehe, mentioned in person, how can I not respond :P

Firstly, I think Black should play at :w4: first to prevent getting sealed in like this, especially as White can bend around in sente too:

Click Here To Show Diagram Code
[go]$$Bc
$$ ---------------------------------------
$$ | . 9 . . . . . . . . . . . . . . . . . |
$$ | . 1 O 2 . . . . . . . . . . . . . . . |
$$ | . . X O . X . . . . . . . . X . . . . |
$$ | . . X O . . . . . , . . . . . , X . . |
$$ | . . 3 4 . . . . . . . . . . . . . . . |
$$ | . 5 O . . . . . . . . . . . . . . . . |
$$ | . 7 6 . . . . . . . . . . . . . . . . |
$$ | . . 8 . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . , . . . . . , . . . . . , . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . X . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . O . . . . . , . . . . . X . . . |
$$ | . . . . . . . . . . O . . O . . X . . |
$$ | . . . . . . . . . . . . . . . O . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ ---------------------------------------[/go]


More points, retains the ability to crawl and jump in the endgame as White cannot bend around in sente any more. However, the descent to the 2-1 at the top left to live is a really good shape principle to remember as well, so good spot for that.

robinz wrote:
Incidentally - and I promise I'm not saying this merely to curry favour with our one observer so far :razz: - but last night I decided to watch some of topazg's videos (which may well have contributed to some of the thoughts I've put down above, as well), and have found that he's not a fan of the slide I played in the bottom-right when I have played the 4-4 in the bottom-left. Oh well, I guess I know what his earlier comments were about now then :D (I can see his point, and of course defer to his vastly greater knowledge of the game than mine, but I'm not sure it can really be called a big mistake at this stage, and certainly not in a game between two 12ks.)


I'm not so sure I'd call it a particularly big mistake. In a game like this, I just find it a bit inflexible, but it's very playable, at least in my mind. In this game, it's also influenced by Black's shimari in the top right, and solidifying his lower right position like this gives a lot more potential for him to expand (for example Q10) the whole right side.


EDIT: Interesting alternatives:

Click Here To Show Diagram Code
[go]$$Wc
$$ ---------------------------------------
$$ | . 4 . . . . . . . . . . . . . . . . . |
$$ | . X O O . . . . . . . . . . . . . . . |
$$ | . . X O . X . . . . . . . . X . . . . |
$$ | . . X O . . . . . , . . . . . , X . . |
$$ | . 2 X O . . . . . . . . . . . . . . . |
$$ | . X O . . . . . . . . . . . . . . . . |
$$ | . 1 3 . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . , . . . . . , . . . . . , . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . X . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . O . . . . . , . . . . . X . . . |
$$ | . . . . . . . . . . O . . O . . X . . |
$$ | . . . . . . . . . . . . . . . O . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ ---------------------------------------[/go]


White can double hane here to seal in more effectively, but risks the following:

Click Here To Show Diagram Code
[go]$$Wc
$$ ---------------------------------------
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . X O O . . . . . . . . . . . . . . . |
$$ | . 7 X O . X . . . . . . . . X . . . . |
$$ | . . X O . . . . . , . . . . . , X . . |
$$ | . 5 X O . . . . . . . . . . . . . . . |
$$ | . X O 3 . . . . . . . . . . . . . . . |
$$ | 6 1 2 . . . . . . . . . . . . . . . . |
$$ | . 4 . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . , . . . . . , . . . . . , . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . 8 . . . . . . . . . . . . . X . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . O . . . . . , . . . . . X . . . |
$$ | . . . . . . . . . . O . . O . . X . . |
$$ | . . . . . . . . . . . . . . . O . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ ---------------------------------------[/go]


Of course White gets good profit anyway, but it's a complicated trade to evaluate, so White needs to be aware of it.

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 Post subject: Re: 77: robinz[12k] v. DIV[12k]
Post #28 Posted: Fri Oct 15, 2010 1:32 am 
Dies with sente
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Ok, I had dead internet yesterday, but had thought about some things. I'll post this move, but thoughts will have to wait until I'm not on a netbook.

Click Here To Show Diagram Code
[go]$$Bcm17 robinz vs DIV - Move 17
$$ ---------------------------------------
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . O 1 . . . . . . . . . . . . . . . |
$$ | . . X O . X . . . . . . . . X . . . . |
$$ | . . X O . . . . . , . . . . . , X . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . O . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . , . . . . . , . . . . . , . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . X . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . O . . . . . , . . . . . X . . . |
$$ | . . . . . . . . . . O . . O . . X . . |
$$ | . . . . . . . . . . . . . . . O . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ ---------------------------------------[/go]

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 Post subject: Re: 77: robinz[12k] v. DIV[12k]
Post #29 Posted: Fri Oct 15, 2010 2:04 am 
Lives in gote

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KGS: robinz
Click Here To Show Diagram Code
[go]$$Wcm18 robinz vs DIV - Move 18
$$ ---------------------------------------
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . O X 1 . . . . . . . . . . . . . . |
$$ | . . X O . X . . . . . . . . X . . . . |
$$ | . . X O . . . . . , . . . . . , X . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . O . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . , . . . . . , . . . . . , . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . X . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . O . . . . . , . . . . . X . . . |
$$ | . . . . . . . . . . O . . O . . X . . |
$$ | . . . . . . . . . . . . . . . O . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ ---------------------------------------[/go]


Hmm, well I hadn't expected that - I did briefly consider it, but didn't see that the obvious move brought me any disadvantage, and still don't. I'm not really sure it changes much (other than letting me capture a stone for free) - Black still has to defend that corner, and all of my previous comments still seem to apply. I'm presuming we'll now see (perhaps I should put it in a trigger, but DIV has surprised me enough times already that I'm nervous doing this - I can't really work out what he's trying to achieve by playing D18):

Click Here To Show Diagram Code
[go]$$Bc robinz vs DIV - Move 18
$$ ---------------------------------------
$$ | . . . 2 . . . . . . . . . . . . . . . |
$$ | . 1 O X O . . . . . . . . . . . . . . |
$$ | . . X O . X . . . . . . . . X . . . . |
$$ | . . X O . . . . . , . . . . . , X . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . O . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . , . . . . . , . . . . . , . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . X . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . O . . . . . , . . . . . X . . . |
$$ | . . . . . . . . . . O . . O . . X . . |
$$ | . . . . . . . . . . . . . . . O . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ ---------------------------------------[/go]

- followed by either B19 or C15, with the same continuations as I talked about yesterday. Of course, it's the same position except that I have a stone at C19 instead of C18. (This probably goes without saying, but I'll say it anyway - if Black, as I expect, descends to B19 from here, I will of course play at C15 and not bother playing C19; that's not necessarily an eye yet anyway at D18, and those stones should be strong enough for the time being. C15 defends the cut in sente, so I want to do it as soon as possible.)

The above was all I was going to write, but I have just noticed that Black may be able to cause me a few difficulties this way:

Click Here To Show Diagram Code
[go]$$Bc robinz vs DIV - Move 18
$$ ---------------------------------------
$$ | . . . 2 . . . . . . . . . . . . . . . |
$$ | . 1 O X O . . . . . . . . . . . . . . |
$$ | . . X O . X . . . . . . . . X . . . . |
$$ | . . X O 5 . . . . , . . . . . , X . . |
$$ | . . 4 3 . . . . . . . . . . . . . . . |
$$ | . . O . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . , . . . . . , . . . . . , . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . X . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . O . . . . . , . . . . . X . . . |
$$ | . . . . . . . . . . O . . O . . X . . |
$$ | . . . . . . . . . . . . . . . O . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ ---------------------------------------[/go]


-- 5 manages to break the ladder against the D15 stone, as well as taking away a liberty from the my stones. However, I can deal with this in at least one way:

Click Here To Show Diagram Code
[go]$$Wc robinz vs DIV - Move 18
$$ ---------------------------------------
$$ | . . . O . . . . . . . . . . . . . . . |
$$ | . X O . O . . . . . . . . . . . . . . |
$$ | . 6 X O 3 X . . . . . . . . X . . . . |
$$ | 7 5 X O X 4 . . . , . . . . . , X . . |
$$ | . . O X 1 . . . . . . . . . . . . . . |
$$ | . . O 2 . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . , . . . . . , . . . . . , . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . X . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . O . . . . . , . . . . . X . . . |
$$ | . . . . . . . . . . O . . O . . X . . |
$$ | . . . . . . . . . . . . . . . O . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ ---------------------------------------[/go]

- setting up a capturing race which it looks like I will win. So I think there's nothing to worry about there. (If a bunch of hidden posts follow this then I know I'll have misread :lol:)

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 Post subject: Re: 77: robinz[12k] v. DIV[12k]
Post #30 Posted: Fri Oct 15, 2010 2:17 am 
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Hmm - Black can make things a bit tricky from that last diagram by playing at B15:

Click Here To Show Diagram Code
[go]$$Bc robinz vs DIV - Move 18
$$ ---------------------------------------
$$ | . . . O . . . . . . . . . . . . . . . |
$$ | . X O . O 3 . . . . . . . . . . . . . |
$$ | . X X O O X . . . . . . . . X . . . . |
$$ | O O X O X X . . . , . . . . . , X . . |
$$ | . 1 O X O . . . . . . . . . . . . . . |
$$ | . 2 O X . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . , . . . . . , . . . . . , . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . X . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . O . . . . . , . . . . . X . . . |
$$ | . . . . . . . . . . O . . O . . X . . |
$$ | . . . . . . . . . . . . . . . O . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ ---------------------------------------[/go]


- and now if I simply capture the stone I lose the race:

Click Here To Show Diagram Code
[go]$$Wc robinz vs DIV - Move 18
$$ ---------------------------------------
$$ | . 4 6 O 3 2 . . . . . . . . . . . . . |
$$ | . X O . O X . . . . . . . . . . . . . |
$$ | 5 X X O O X . . . . . . . . X . . . . |
$$ | O O X O X X . . . , . . . . . , X . . |
$$ | 1 X O X O . . . . . . . . . . . . . . |
$$ | . O O X . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . , . . . . . , . . . . . , . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . X . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . O . . . . . , . . . . . X . . . |
$$ | . . . . . . . . . . O . . O . . X . . |
$$ | . . . . . . . . . . . . . . . O . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ ---------------------------------------[/go]


Thankfully, I have a more intelligent move at B19, instead of taking the stone, and then Black's dead. There are lots and lots of possible variations here, and I'm sure I haven't seen them all. So I'll save detailed analysis for if any of this actually happens - but I think I have resources available against anything Black chooses to throw at me.

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 Post subject: Re: 77: robinz[12k] v. DIV[12k]
Post #31 Posted: Fri Oct 15, 2010 2:40 am 
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@robinz

Think how much less reading you'd have to do if C18 was at C15 :) Far less headaches! Don't take this as a criticism at all as it isn't - it's always fun when things get into complicated-land to have a look-see and think whether it could have been avoided.

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 Post subject: Re: 77: robinz[12k] v. DIV[12k]
Post #32 Posted: Fri Oct 15, 2010 3:09 am 
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topazg wrote:
@robinz

Think how much less reading you'd have to do if C18 was at C15 :) Far less headaches! Don't take this as a criticism at all as it isn't - it's always fun when things get into complicated-land to have a look-see and think whether it could have been avoided.


lol, fair comment :) For some reason C15 didn't even occur to me - I guess it's because I already had C14 to block black in that direction, and I wanted to make my opponent's corner smaller (and perhaps in some sense more killable, at least in the sense of there being more ko threats against it). But now I think about it, you're right - it would have made things a lot easier. I'll try to remember that next time an opponent plays the 3-3 in a similar position.

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 Post subject: Re: 77: robinz[12k] v. DIV[12k]
Post #33 Posted: Sat Oct 16, 2010 2:02 am 
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alright, still stuck with this whatever-forsaken netbook. Tomorrow I'll at least have access to a mac, and should be playing some Go against a new to the game player, should be fun. I'll post thoughts and let him look at the game, should be a good experience.

Click Here To Show Diagram Code
[go]$$Bcm19 robinz vs DIV - Move 19
$$ ---------------------------------------
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . 1 O X O . . . . . . . . . . . . . . |
$$ | . . X O . X . . . . . . . . X . . . . |
$$ | . . X O . . . . . , . . . . . , X . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . O . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . , . . . . . , . . . . . , . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . X . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . O . . . . . , . . . . . X . . . |
$$ | . . . . . . . . . . O . . O . . X . . |
$$ | . . . . . . . . . . . . . . . O . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ ---------------------------------------[/go]

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 Post subject: Re: 77: robinz[12k] v. DIV[12k]
Post #34 Posted: Sat Oct 16, 2010 2:35 am 
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Click Here To Show Diagram Code
[go]$$Wcm20 robinz vs DIV - Move 20; prisoners: Black 0 White 1
$$ ---------------------------------------
$$ | . . . 1 . . . . . . . . . . . . . . . |
$$ | . X O . O . . . . . . . . . . . . . . |
$$ | . . X O . X . . . . . . . . X . . . . |
$$ | . . X O . . . . . , . . . . . , X . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . O . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . , . . . . . , . . . . . , . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . X . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . O . . . . . , . . . . . X . . . |
$$ | . . . . . . . . . . O . . O . . X . . |
$$ | . . . . . . . . . . . . . . . O . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ ---------------------------------------[/go]


I added a bit to the text to count prisoners, now that we have one. There's probably a tidier way of doing it though...

Completely forced, as far a I can see. Nothing to add from earlier comments - except that it occured to me last night that black C15 now could cause me some more problems than I perhaps appreciated (as I can't play at B17). I'll probably play B19, and then D15 if black defends against B17. I think I still should get sente out of this, but black has ways of making it messy.

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 Post subject: Re: 77: robinz[12k] v. DIV[12k]
Post #35 Posted: Sat Oct 16, 2010 4:59 pm 
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Click Here To Show Diagram Code
[go]$$Bcm21 robinz vs DIV - Move 21; prisoners: Black 0 White 1
$$ ---------------------------------------
$$ | . . . O . . . . . . . . . . . . . . . |
$$ | . X O . O . . . . . . . . . . . . . . |
$$ | . . X O . X . . . . . . . . X . . . . |
$$ | . . X O . . . . . , . . . . . , X . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . 1 O . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . , . . . . . , . . . . . , . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . X . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . O . . . . . , . . . . . X . . . |
$$ | . . . . . . . . . . O . . O . . X . . |
$$ | . . . . . . . . . . . . . . . O . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ ---------------------------------------[/go]

ok, sorry for no thoughts. I decided to try to make this corner work. Here's a few possibilities:

Click Here To Show Diagram Code
[go]$$Wcm22 robinz vs DIV; prisoners: Black 0 White 1
$$ ---------------------------------------
$$ | . . . O . . . . . . . . . . . . . . . |
$$ | . X O . O . . . . . . . . . . . . . . |
$$ | . . X O . X . . . . . . . . X . . . . |
$$ | . . X O . . . . . , . . . . . , X . . |
$$ | . . 2 3 . . . . . . . . . . . . . . . |
$$ | . X O 5 . . . . . . . . . . . . . . . |
$$ | . 1 4 . . . . . . . . . . . . . . . . |
$$ | . 6 . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . , . . . . . , . . . . . , . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . X . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . O . . . . . , . . . . . X . . . |
$$ | . . . . . . . . . . O . . O . . X . . |
$$ | . . . . . . . . . . . . . . . O . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ ---------------------------------------[/go]
I think this is one of more likely options, I think I can get life from this even if he throws in, though not sure exactly. There's also the possibility he won't block at 5 which means I might be able to get out or poke and cut. We'll see I guess.


Thanks for patience robinz and others, computer situation has gotten odd in the past week.

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 Post subject: Re: 77: robinz[12k] v. DIV[12k]
Post #36 Posted: Sun Oct 17, 2010 4:38 am 
Lives in gote

Posts: 414
Location: Durham, UK
Liked others: 96
Was liked: 15
Rank: KGS 9k
KGS: robinz
No need to apologise for your computer problems (you've still managed to make a move, or at least post an apology for no move, every day - I don't think apologies are needed until you've been unable to do anything for 3 or 4 days). Hope things are better now, anyway :)

Click Here To Show Diagram Code
[go]$$Wcm22 robinz vs DIV - Move 22; prisoners: Black 0 White 1
$$ ---------------------------------------
$$ | . . . O . . . . . . . . . . . . . . . |
$$ | . X O . O . . . . . . . . . . . . . . |
$$ | . . X O . X . . . . . . . . X . . . . |
$$ | . . X O . . . . . , . . . . . , X . . |
$$ | . . . 1 . . . . . . . . . . . . . . . |
$$ | . X O . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . , . . . . . , . . . . . , . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . X . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . O . . . . . , . . . . . X . . . |
$$ | . . . . . . . . . . O . . O . . X . . |
$$ | . . . . . . . . . . . . . . . O . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ ---------------------------------------[/go]


It shouldn't surprise me any more I guess that my opponent has found another move that I didn't consider at all. The first move that came into my head was C15, but then I decided I liked the look of B15. I'm now also thinking about D15. I haven't even decided on my move as I start to type this, but hope that doing so will bring some clarity to my thoughts and allow me to discover which move I prefer.

So, let's consider what happens if I play C15. Black will surely play B15 (otherwise I see no point at all in his last move) - and, other than having sente, I can't say I like the result very much - Black is alive, with more points than I would want, and can push out (or perhaps even hane at C13) from his corner. What is more, that cut at D15 now seems to work, as black at D14 is now an atari, so I may well need to make yet another move to defend here, and I'll have achieved none of the aims I wanted from this corner situation. Thus I'm going to rule out C15.

What about B15, then? The advantage of this is that it succeeds in cutting black's just-played keima, and also leaves a lack of eyespace in the corner, forcing Black to run. The downside, if such it is, is that the continuations are very messy (I have learned my lesson for next time topazg!). Given how complicated it is, and how many unexpected moves DIV has made, I'm not going to give many variations, but here is one sequence I can envisage:

Click Here To Show Diagram Code
[go]$$Wc robinz vs DIV - Move 22; prisoners: Black 0 White 1
$$ ---------------------------------------
$$ | . . . O . . . . . . . . . . . . . . . |
$$ | . X O . O . . . . . . . . . . . . . . |
$$ | . . X O . X . . . . . . . . X . . . . |
$$ | . 4 X O . . . . . , . . . . . , X . . |
$$ | . 1 2 6 . . . . . . . . . . . . . . . |
$$ | 5 X O . . . . . . . . . . . . . . . . |
$$ | . 3 . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . , . . . . . , . . . . . , . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . X . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . O . . . . . , . . . . . X . . . |
$$ | . . . . . . . . . . O . . O . . X . . |
$$ | . . . . . . . . . . . . . . . O . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ ---------------------------------------[/go]

- actually looking at the position makes me like this less than I thought I did; the problem is Black's move 4 here, which makes an eye in sente (OK I can play at A16 to stop it becoming an eye, but after BA17 WA15 black has yet another move to cause me problems), thus still allowing Black to run. Meanwhile my stones are cut to pieces and lacking in liberties. D18 isn't even an eye yet, although I could make it so by playing at E17 next. On the other hand, Black still can't obviously link up to the F17 stone, and if I can surround and capture it quickly I should be OK. But while I'm doing that Black can either cause all kinds of chaos with the group running out from the corner, or simply play big points elsewhere.

So my conclusion about this move is that it's a lot better than C15, but it gets into a big messy fight (such situations being one of the weaker parts of my game), which may well not be that favourable - so I'm not going to make it unless I really dislike the result from D15.

As for D15, it seems to be the obvious move for a nice quiet life. But I don't think I can keep sente - Black will obviously play at C15, and I have another cut to worry about at D14. The best way of handling that looks to me to be the following:
Click Here To Show Diagram Code
[go]$$Wc robinz vs DIV - Move 21
$$ ---------------------------------------
$$ | . . . O . . . . . . . . . . . . . . . |
$$ | . X O . O . . . . . . . . . . . . . . |
$$ | . . X O . X . . . . . . . . X . . . . |
$$ | . . X O . . . . . , . . . . . , X . . |
$$ | 2 . X O . . . . . . . . . . . . . . . |
$$ | . X O . . . . . . . . . . . . . . . . |
$$ | . 1 . 3 . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . , . . . . . , . . . . . , . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . X . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . O . . . . . , . . . . . X . . . |
$$ | . . . . . . . . . . O . . O . . X . . |
$$ | . . . . . . . . . . . . . . . O . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ ---------------------------------------[/go]

(2 could of course be at a couple of other places as well; what's important here is that some move there needs to be played). The good news is that Black is sealed in and I'm conected - the bad news is that black has sente (as well as a couple of potentially annoying peeps for later - indeed the one at E14 looks already quiet effective, if it's followed up by E15 or F15).

Oh - but what if Black plays B15 instead of C15? It looks very small and passive, and I will have sente, but Black won't be sealed in any longer. I can't hane - I can quietly extend, and am more than happy for Black to crawl along the second line will giving me a third line wall, but of course Black won't do that and will take his sente elsewhere. Or I could just take sente, and let Black try to make things complicated again with B13 or C13.

Well, that's a choice I won't have to make until later, and I think I prefer any of these outcomes to the messiness of the B15 option. Hence I've decided on D15.

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 Post subject: Re: 77: robinz[12k] v. DIV[12k]
Post #37 Posted: Sun Oct 17, 2010 10:56 pm 
Gosei
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GD Posts: 264
KGS: Chew
Prediction, not for players:
Click Here To Show Diagram Code
[go]$$Wcm22 robinz vs DIV; prisoners: Black 0 White 1
$$ ---------------------------------------
$$ | . . . O . . . . . . . . . . . . . . . |
$$ | . X O . O . . . . . . . . . . . . . . |
$$ | . 9 X O . X . . . . . . . . X . . . . |
$$ | . . X O . . . . . , . . . . . , X . . |
$$ | . 7 2 3 . . . . . . . . . . . . . . . |
$$ | . X O 5 . . . . . . . . . . . . . . . |
$$ | 8 1 4 . . . . . . . . . . . . . . . . |
$$ | . 6 . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . , . . . . . , . . . . . , . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . X . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . O . . . . . , . . . . . X . . . |
$$ | . . . . . . . . . . O . . O . . X . . |
$$ | . . . . . . . . . . . . . . . O . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ ---------------------------------------[/go]

I just saw this shape recently. I think it was in one of Judicata's games. While he played to avoid it and no sacrifice occured, I bet it will happen here, accident or no. While not horrible for black, thanks to the ponnuki, it's still hard to give up that much so early on.

_________________
Someday I want to be strong enough to earn KGS[-].

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 Post subject: Re: 77: robinz[12k] v. DIV[12k]
Post #38 Posted: Wed Oct 20, 2010 2:10 am 
Lives in gote

Posts: 414
Location: Durham, UK
Liked others: 96
Was liked: 15
Rank: KGS 9k
KGS: robinz
I guess my opponent is still having computer problems. But to keep this game in the minds of some spectators, a few more of my thoughts on the current position:

(These are in no particular order):
1. I realise now that I was far too harsh on C15 when going through the options for my last move. The position after black responds at B15 seems not to be different in any significant way from that which will result if he plays B15 in response to my actual move at D15. My position looks eminently playable to me, although it remains to be seen how well I can actually do with it. (Note that I still prefer the move I made - if black plays C15 the double hane at B13 seems to work pretty well, while if he plays B15 then at least I don't have any cutting points to immediately worry about.)

2. It's worth pointing out that, if Black does play C15, the double hane only works because of the following nice variation:

Click Here To Show Diagram Code
[go]$$Bc robinz vs DIV - Move 22
$$ ---------------------------------------
$$ | . . . O . . . . . . . . . . . . . . . |
$$ | . X O . O . . . . . . . . . . . . . . |
$$ | . 8 X O . X . . . . . . . . X . . . . |
$$ | . . X O . . . . . , . . . . . , X . . |
$$ | . 6 1 O . . . . . . . . . . . . . . . |
$$ | . X O 4 . . . . . . . . . . . . . . . |
$$ | 7 2 3 . . . . . . . . . . . . . . . . |
$$ | . 5 . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . , . . . . . , . . . . . , . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . X . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . O . . . . . , . . . . . X . . . |
$$ | . . . . . . . . . . O . . O . . X . . |
$$ | . . . . . . . . . . . . . . . O . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ ---------------------------------------[/go]


- clearly Black won't actually play this way, but it's nice to know that I have a refutation if he does try to cut me apart :D

3. If Black does play at C15, and then defends in response to B13, I spoke earlier about defending the two threatened cuts with the trumpet connection at D13. But I didn't like that because of the opportunities it leaves for Black to peep. So I started to think about other ways of defending, and at the moment am quite keen on solidly connecting at D14, to avoid that peep. The cut at C13 doesn't immediately work for Black because I have a working ladder. Of course, leaving ladder aji isn't necessarily better (and could easily be worse) than leaving peep aji, but the area of the board that the ladder runs towards doesn't look immediately interesting, so I should be able to defend in response to any ladder-breaker, without losing too much. The problem with the trumpet connection (as I mentioned earlier) is that the peep at E14 is very useful for Black in running out with the F17 stone. (This by no means a final decision, of course - I will reconsider the best way of defending if the decision actually comes up on the board.)

4. Whatever happens, it seems clear that this top-left corner is going to be abandoned after another 3 or 4 moves. B19 looks like it will be a fairly huge point come the endgame - I make it about 4 points in double sente. But I feel it would be foolish for either of us to play it at this stage - Black's follow up at C19 is only a 1-point move, so black at B19 isn't actually sente until very late in the endgame, and if Black tries it before I shall be very happy to ignore it. If I play B19, of course, it's still extremely sente (hmm, are there degrees of "sente-ness"? :-? ), as it threatens to kill Black's group - but for this very reason I would much rather keep it in reserve as a ko threat. (In fact, if it comes to a ko fight and I'm after threats here, I think playing one at B17 first will yield a second ko threat.)

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 Post subject: Re: 77: robinz[12k] v. DIV[12k]
Post #39 Posted: Thu Oct 21, 2010 1:36 am 
Dies with sente
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Rank: KGS 12k
KGS: DIVINATION
work and computer problems to be precise, double shifts/broken batteries, anyway, here's my move move though later. All apologies.

Click Here To Show Diagram Code
[go]$$Bcm23 robinz vs DIV - Move 23; prisoners: Black 0 White 1
$$ ---------------------------------------
$$ | . . . O . . . . . . . . . . . . . . . |
$$ | . X O . O . . . . . . . . . . . . . . |
$$ | . . X O . X . . . . . . . . X . . . . |
$$ | . . X O . . . . . , . . . . . , X . . |
$$ | . 1 . O . . . . . . . . . . . . . . . |
$$ | . X O . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . , . . . . . , . . . . . , . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . X . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . O . . . . . , . . . . . X . . . |
$$ | . . . . . . . . . . O . . O . . X . . |
$$ | . . . . . . . . . . . . . . . O . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ ---------------------------------------[/go]


ok, if he plays hane on either side I think I can get life, though not sure still, played through it in many ways, but he has played some things I didn't expect. I am aware that I am giving him thickness all over up there, and weakening some other stones. Even if I lose this battle though, there is more war to be fought.

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 Post subject: Re: 77: robinz[12k] v. DIV[12k]
Post #40 Posted: Thu Oct 21, 2010 1:51 am 
Lives in gote

Posts: 414
Location: Durham, UK
Liked others: 96
Was liked: 15
Rank: KGS 9k
KGS: robinz
Click Here To Show Diagram Code
[go]$$Wcm24 robinz vs DIV - Move 24; prisoners: Black 0 White 1
$$ ---------------------------------------
$$ | . . . O . . . . . . . . . . . . . . . |
$$ | . X O . O . . . . . . . . . . . . . . |
$$ | . . X O . X . . . . . . . . X . . . . |
$$ | . . X O . . . . . , . . . . . , X . . |
$$ | . X . O . . . . . . . . . . . . . . . |
$$ | . X O . . . . . . . . . . . . . . . . |
$$ | . . 1 . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . , . . . . . , . . . . . , . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . X . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . O . . . . . , . . . . . X . . . |
$$ | . . . . . . . . . . O . . O . . X . . |
$$ | . . . . . . . . . . . . . . . O . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ ---------------------------------------[/go]


Not much to say, for once - I've already discussed this possible continuation. I need a further move here to stop Black getting out, and while on a second look playing B13 might not be disastrous, it does leave weaknesses which Black could well exploit later - and as I'm pretty sure I can't kill, there's absolutely no point. So the solid extension it is, and let's see where Black tenukis to (I can't believe he's going to push from behind along the second line, but if he does I'm more than happy to oblige :D ). My next move may well require quite a lot of thought - but for once I can't be bothered to waffle about it now, but will wait till I need to make it.

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