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Non-Local Move Versus a Local Move
Path: ForcingAndInitiative · Prev: ThreateningAKo · Next: IntermediatePlays
Difficulty: Beginner
Keywords: Tactics
Compare the following two situations (grossly oversimplified):
and
The way I see it (25-20 kyu), the second move is better because Black does not have to worry as much about the rest of the board. The ladder depends on the absence of white stones in the ladder-breaking-area (marked points - possibly I'm a few lines off here :-) ) while the net nearly always works. Correct. Kageyama writes: I would like to comment on your diagram, though. In the position on the diagram both moves are small, because the white stone is not important (non-cutting stones). If you capture it you'll spend a move for two points, which is too little with so much empty space. As soon as the black group is alive, everything in this corner is endgame. I believe that one of the reasons low kyu players lose their games is because they make too many small moves. Get rid of the moves that capture a single unimportant stone, and your strength will increase considerably. To illustrate the same principle I would suggest a following diagram that is logical.
Here, the marked stone may run away, splitting Black in two groups. Each of them will have to live separately. Now Black 1 not only captures a stone, but also connects two groups and is likely to form an eye, which makes it a very good move. Kageyama also says: if you can capture a stone firmly, don't capture it loosely. Applied to your diagrams this means:
The net leaves forcing moves at a and b.
The ladder captures the stone more firmly, and actually it's no ladder at all, because after White 2 Black can play geta with 3.
I'm not saying that this is the optimal move; I'd play the geta move at 1 myself, but one should always think about options and (gasp) think some moves ahead :o)
This is the best closing technique I can see. Having this option is clearly preferable to having only a ladder aimed out into the wild blue yonder, but it still has to reach out a significant distance, and is also vulnerable to spoilers nearby. The early geta seems much more decisive and reliable.
The above attack is dependent on the rather artificial isolated corner position. In my humble opinion, a shape like this would be farther out and much less isolated. Furthermore, it also has the above-mentioned forcing points. I've played around with this out in the middle, and it's messy. I'm not sure, but I think White can live, even without any help around. It's seems to be a complicated situation. Can anyone point out a foolproof capture I missed?
AvatarDJFlux (3k): Yes, you spotted the right sequence in the first diagram, except that White will never play it (especially White 5...), because she hopefully can read that she has no way out. Instead she will keep the moves in reserve as possible ko threats.
But: even considering that position in isolation on the Goban, White will have anyway a hard time trying to save her eyeless and shapeless string of stones, caught in the middle of two strong black positions! TheDullBlade: Ah, thanks. My point was that the "turn the ladder into a net" trick does not produce a neat, small widely-applicable net as the initial net does, but is dependent on odd circumstances. Usually a wall like that will exist to wall something off, in which case White can probably escape, either by reaching around or running out when Black blocks the reach. In the process, she would destroy the eye point preserved by the initial net and threaten to surround and isolate Black's wall. This is my second encounter with Kageyama's "choose the firmer capture?" principle (the first at geta). Both have lead to rather controversial advice. Is this preference for ladders really what he meant?
DJ: Not exactly: the idea is to capture the cutting stone(s) in a way to minimise the possibilities of threats of pulling it (them) out. In other words, the firmer way is the one that gives the opponent the smallest number of kikashis (peeps, ladder breakers, etc.) Path: ForcingAndInitiative · Prev: ThreateningAKo · Next: IntermediatePlays This is a copy of the living page "Non-Local Move Versus a Local Move" at Sensei's Library. (C) the Authors, published under the OpenContent License V1.0. |