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Amateur Fuseki 5
Path: AmateurFuseki · Prev: AmateurFuseki4 · Next: AmateurFuseki6 Could someone please provide some feedback on this fuseki:
Is in this constellation
After
Was
After
Many thanks!
Dieter: I think that
iff: Ok -
dnerra: I would also play
Although a now is too close to his own thickness, it remains available, in case the ladder at b works for White. It is unlikely though that the corner would settle down with the ladder aji still around. The hane at c is a weakness for White and strengthens Black more than the hane at d. Given the fact that the ladder doesn't work ...
... White's proper move is this hane. (Joseki issues:) I don't know whether (Fuseki issues). After this diagram, a has clearly become more interesting for White than b. On the other hand, it doesn' really hurt the corner either. Black will make a comfortable shimari. If he were at the other 3-4 point, he'd have to play kosumi, which loses a little. All this makes me believe that the wedge was not a prime idea in this fuseki, but here I am on thin ice.
unkx80: Dieter said that exchanging Black a with White b weakens the Black group, and then later proceeds to say that (without the exchange) c would be more interesting to White compared to b. This sounds like a contradiction to me. Rather, I think that if the Black a and White b exchange can be made, the exchange is favourable to Black because if White has to form a base on the side, then White's corner group will be affected. The only remaining problem is, whether White will really play at b if Black plays at a. Alex Weldon: Also worth noting (in terms of why the wedge wasn't the best idea for W here, though it's sometimes playable); we now have a low, strong position in the lower right, creeping out towards W's hoshi in the lower left. That corner is now devalued for W. If that stone was at, say, san-san, it'd be a different story. (iff: could you please elaborate on this (hoshi vs san-san) a bit more?) So if you want an example of when the wedge would be playable, imagine W san-san in the lower left, and B's upper right komoku facing the other way. Elaboration requested by iff: Hoshi aims to develop on a large scale, while san-san is self-contained. Therefore, the value of a hoshi stone is strongly affected by what's going on nearby. Low positions, in which both sides are strong (especially where one person is crawling towards the hoshi, and the other is building a wall facing away from it) or other situations in which a side of the board is "played out" tend to reduce the value of a hoshi stone, and allow the opponent to invade san-san and cause overconcentration in your position. San-san, on the other hand, will take about the same amount of territory, no matter what the opponent is doing on adjacent sides of the board. Meanwhile, it is itself a low, strong position, and reduces the value of thickness and high, developping positions nearby. iff Thanks a lot for your elaboration (the concept of "low" however is not quite clear to me: Does that just mean on the 3rd row or is there more behind?). I try to rephrase a bit to see if I really understand you: The idea of a hoshi is large-scale development. So if your opponent is not yet strong in the hoshi's neighbourhood an invasion at 3-3 is not a problem because you get thickness to the outside and will profit from that. If however the opponent has a strong position near the hoshi you have to worry about a 3-3 invasion as you might not be able to profit from the thickness you get. Therefore typically a game development in which your hoshi is approached by a strong group is a loss. Is that about right? Alex Weldon: Low just means 2nd or 3rd line. High means 4th and above. You've got it, more or less, though it's not neccessary for a san-san invasion to happen to result in a loss if low, stable positions approach your hoshi. Really, it's just that low, stable positions are detrimental to moyo building, which is what hoshi is for. If you can't use the influence of your hoshi stone, you have to use it for territory, either by closing the corner, or making a short extension from the wall after san-san (because the long one is blocked), but using hoshi for territory in these ways is inefficient. iff Thanks a lot again...this is really very useful stuff for me. The one thing I still don't understand is the relevance of the "low": Does not a high - in fact any - stable position in the surroundings of your hoshi devaluate it for moyo building?
Bill: I agree with Dnerra that B23 sucks the big one, with Dieter that B11 is premature, and with unkx80 that White may well not reply with W12, and with the consensus that On the point about B11's being premature:
Suppose that Black plays
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