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Because it stops black playing in that area, and black's move there is better than black's move on the lower side as it threatens the invasion at c. White could defend against that by jumping to d, but that means black got to make the extension in sente which is nice for him. Also the white move on the bottom is rather flat and doesn't really threaten anything nasty to black's lower right corner (white's move at the top doesn't really threaten that corner much either).PeterPeter wrote: Why did the book rate 'b' much higher?
Sort of, but not really. Both white groups will feel a little unhappy if black approaches, and white will feel he owes a move in each case (I think); both can strengthen themselves with a silly little flat extension on the 3rd line, but it's not worth many points. And don't forget that white will take one and black will take the other. So the question is really: which is more profitable for black? Both are also little flat extensions for black. But notice that the lower one has little potential to build from, whereas the upper one forms a double wing (even if a rather tight one), and black can expect to gain not only a few tiny points on the side, but also more inside the double wing formation.PeterPeter wrote:OK. Is it the fact that the white stone with the triangle is weaker than the one with the square?
Because the triangled stone is three spaces away, the connection is more open to invasion than the two space. White might want to reply to both black moves at some point to strengthen his groups or connection, but...PeterPeter wrote: OK. Is it the fact that the white stone with the triangle is weaker than the one with the square?
That's not a thought that consciously crosses my mind when preferring the move on the top side (I think "black's m17 aims at h17", but I suppose yes it is weaker in that it is 3 spaces away from its nearest support, and thus there is the h17 invasion to worry about, whereas the lower side stone is only 2 spaces away so black moves in that area don't aim at anything. Neither of them are weak groups though. The weak groups here are black's two stones in the lower left and white's on the left side so that is the most important place to play. One idea would be c4 to stop those black stones making eyes in the corner and get the corner profit for ourselves, but as g3 is low it doesn't look so easy to attack black severely, which is why I like c13 which makes it harder for black to invade at c10 (the same middle point of a 3 space extension from 3rd to 4th line as h17 on top) as he can no longer link up to his group above, and c13 itself is pretty much sente on the black group above.PeterPeter wrote: OK. Is it the fact that the white stone with the triangle is weaker than the one with the square?
This is quite an interesting question if you've not seen it before. If black ignores c13, how does white attack the black group? Someone was asking about studying shape, this is a great lesson in it.Uberdude wrote:and c13 itself is pretty much sente on the black group above.
Uberdude wrote:This is quite an interesting question if you've not seen it before. If black ignores c13, how does white attack the black group? Someone was asking about studying shape, this is a great lesson in it.Uberdude wrote:and c13 itself is pretty much sente on the black group above.