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#205: The Intrepid vs. topazg: The Pistols http://lifein19x19.com/viewtopic.php?f=37&t=7716 |
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Author: | The Intrepid [ Mon Sep 09, 2013 3:06 pm ] |
Post subject: | Re: #205: The Intrepid vs. topazg: The Pistols |
Super smart mode ... ACTIVATED! Why make life when one can tenuki? The only challenging variation is this:
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Author: | topazg [ Mon Sep 09, 2013 3:39 pm ] |
Post subject: | Re: #205: The Intrepid vs. topazg: The Pistols |
I've not read this out fully, but it's hard for White to cut off here without inviting a fight back, and as I'm sort of eyeing up that stone collection up there I may as well encourage White to get all messy with things. |
Author: | The Intrepid [ Mon Sep 09, 2013 5:27 pm ] |
Post subject: | Re: #205: The Intrepid vs. topazg: The Pistols |
The two Black stones are essentially captured. It would be very risky for Black to try to run with them without additional Black presence in the center. Also, the weakness at P8 is now much less threatening. Currently, Black is behind in the game by a big margin. For topazg to make a comeback, he needs to make something massive happen inside of White's moyo on the left. If Black does the invasion at E12, I intend to sacrifice the C13 stone in exchange for sente (to possibly attack the lone Black stone in the middle of the board:
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Author: | topazg [ Mon Sep 09, 2013 5:55 pm ] |
Post subject: | Re: #205: The Intrepid vs. topazg: The Pistols |
Cutty cutty! |
Author: | The Intrepid [ Tue Sep 10, 2013 3:12 am ] |
Post subject: | Re: #205: The Intrepid vs. topazg: The Pistols |
I expect the following:
I spent quite a bit of time trying to analyze the consequences of this cut. I also considered whether it makes sense to let Black rescue his group on the left in exchange for protecting the cut. It doesn't. The difference in points between the two outcomes is simply too great to choose the safer variation.
Besides, I might actually be able to get away with playing this in response to the cut:
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Author: | topazg [ Tue Sep 10, 2013 6:00 am ] |
Post subject: | Re: #205: The Intrepid vs. topazg: The Pistols |
Lots of only moves. |
Author: | The Intrepid [ Tue Sep 10, 2013 10:49 am ] |
Post subject: | Re: #205: The Intrepid vs. topazg: The Pistols |
So far as expected. Now, to cut or not to cut? |
Author: | topazg [ Tue Sep 10, 2013 6:10 pm ] |
Post subject: | Re: #205: The Intrepid vs. topazg: The Pistols |
Some thinking and reading behind this, but this feels like the right cut to make. I now need to consider the best way forward from here. The marked white stones are an obvious target, but claiming the top is still a real coup. So White has to carefully manage both, and I have a lot of aji to exploit. Unfortunately "a" is not a threat because even if I connect I have no eyes, and "b" means there isn't really a capturing race. However:
means that standard sorts of tesujis like don't work, and I'm more than happy sac'ing those 4 for a big wall. Of course, if "a" in the first dia was an actual threat, then this would capture, but you can't have everything. The game doesn't look great to be honest if I fail to get something here. It's not a complete disaster, but I'm behind. I don't know what I was thinking with that group in the lower right before I went AWOL, but it wasn't clever thoughts. |
Author: | The Intrepid [ Wed Sep 11, 2013 5:21 pm ] |
Post subject: | Re: #205: The Intrepid vs. topazg: The Pistols |
Some Analysis: It looks like I'm fine if I meet topazg head on and launch an attack against his cutting stone (although I still have one variation that I haven't quite worked out, yet). However, my dilemma is this. If I enter the complications and my reading is sound, the game will be effectively over because Black will be too far behind to have any chance of catching up. If my reading is not sound, though, I risk suffering a big loss, making the game close again, or even reversing the game in Black's favor. On the other hand, if I choose to play safely, letting Black capture the stones at the top in exchange for solidifying the center, I will still be winning, but Black will have caught up point-wise somewhat. As such, the game would go on for some time longer, and Black could still harbor hopes of reversing the game. Given this dilemma, here's what I'll do. I'll take some time off to rest. Then, with a clear head, I will revisit the variations below. If I find no fault in my current reading and if I manage to work out the one remaining variation, I'll play the principled (riskier) move. Incidentally, if any of you sees an error in any of the diagrams below, send me a PM with all the pertinent analysis ... just kidding. 1. The safer option, variation 1: White stones get captured, but Black is left with very little aji to exploit in the center
2. The safer option, variation 2: White gets ko for life, but probably can't win the ko
3. The safer option, variation 3: White again gives up on the stones at the top, but Black has more aji than in variation 1, if White tenukis
4. The riskier option, variation 1: White top-right group escapes to the outside while Black cutting stones are in danger
5. The riskier option, variation 2: White prevails with a similar result to variation 1
6. The riskier option, variation 3: White's top-right group gets cut off from the center, but makes life while Black cutting group remains weak
Notice the highlighted liberty. Without it, White would only have a ko (as shown before). Without this liberty, Black kills as follows:
7. The riskier option, variation 4: the remaining variation I have yet to work out, but White seems to prevail
This position is still unclear to me, but White ought to fine here. |
Author: | The Intrepid [ Sat Sep 14, 2013 1:42 pm ] |
Post subject: | Re: #205: The Intrepid vs. topazg: The Pistols |
In the end, I had to reject the more agressive approach because of the following:
I took additional time to think, however, because I discovered another way for White to play here:
Next, WL15 does not work:
However, WM14, is worth considering:
However, Black has sente in this variation. Plus, Black has additional support (in the form of the marked Black stones) for an invasion into Whtie's moyo. In particular, I was worried about Black playing something like this:
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Author: | topazg [ Sat Sep 14, 2013 5:26 pm ] |
Post subject: | Re: #205: The Intrepid vs. topazg: The Pistols |
Ok, lots of points up here. That's something at least ... still not ready to count just now. |
Author: | The Intrepid [ Sat Sep 14, 2013 10:43 pm ] |
Post subject: | Re: #205: The Intrepid vs. topazg: The Pistols |
I think topazg could have gotten away with N14. If he played there, I was going to check once more whether or not I could respond with N15, but I don't think it works.
As for the move in the game, I thought about playing at H6 first, but I couldn't convince myself that this move is sente. This will cost me some points if Black plays at G6 next, but I should still be ahead by 10 points or so. |
Author: | topazg [ Sun Sep 15, 2013 7:40 am ] |
Post subject: | Re: #205: The Intrepid vs. topazg: The Pistols |
A bit loose, but I want to see how he responds. I have lots of aji to aim for here..
"x-z" are endgame points that interest me. "a-e" points are interesting areas that make me giggle. I'll happily explain the reasoning behind any if asked |
Author: | The Intrepid [ Tue Oct 01, 2013 10:56 pm ] |
Post subject: | Re: #205: The Intrepid vs. topazg: The Pistols |
When I was previously estimating territory, I was not counting the marked intersections:
Instead of in the game, I also considered the following move, with the idea to ward against the invasion at "a" more forcefully:
I also looked at whether Black has anything after , but it does not look like he does:
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Author: | topazg [ Tue Jun 10, 2014 7:49 am ] |
Post subject: | Re: #205: The Intrepid vs. topazg: The Pistols |
Gosh, I'd forgotten all about this game. I must admit, it does look rather bad for me. Without a very large rip-off I seem to be in a spot of trouble, so I think I shall resign here rather than drag it out further... If anyone wants to play a game with me, I'm planning on being around a little bit more, so just send me a PM |
Author: | The Intrepid [ Wed Jun 11, 2014 8:39 am ] |
Post subject: | Re: #205: The Intrepid vs. topazg: The Pistols |
Thanks for the game, topazg! I haven't looked at this game (or at Go in general) for awhile myself. From what I remember, though, the game got decided on the bottom-right side of the board. I think I was in the lead slightly beforehand (probably by about a komi), but then you started losing some stones out there. I'll read your hidden comments at some point, so hopefully I'll find out what you missed. It should be interesting to read the hidden comments from the observers, too. Given the opening moves and given how I played in the top-right, I bet there will be some interesting comments. |
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