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Three Three Point Invasion
Difficulty: Beginner
Keywords: Joseki
The information on this page is meant for lower kyu players. Higher kyu players and dan players are advised to look at ThreeThreePointInvasionJoseki instead.
Many weak players fear the invasion of white 1 in this diagram. Playing black, they have the idea that 'their' corner territory is taken away. And in a sense they are right. After white 1, it is white rather than black who will make territory in this corner. Nevertheless, black should welcome this invasion. He should see this move not as an attack on his territory (the 4-4 point is not in the first place meant to take the corner territory), but as an opportunity to make thickness. By going in deep with this white 1, white is separating his stone from the rest of the board. Black on the other hand will, if everything goes right, get a position that will be an important factor in the far environment. Because of this, stronger players will only play white 1 if the position on the edges is such that a white stone at A or B will come under attack.
To white 1 black will invariably answer with black 2 (or black 3 on the other side). White 3 avoids white's corner from becoming too small. Black 4 is next an important move. With this move, black pushes white towards the side, thus reducing the size of the white corner. White plays at 5 to avoid black playing at the same spot. After white 7, black extends at 8.
Next white plays hane at 1, and the joseki ends with black 4. White has sente and a few points in the corner, but black's wall? is like a block of concrete. His thickness controls a large part of the board. This result is regarded good for black locally, but if the circumstances are right it is often still white's best choice.
Black 1 here instead of black 8 in the joseki (2 in this diagram) is overdoing things. After white 8, black is in large problems.
White could also go after the black stones at the left with these moves. Either way, white has destroyed black's thickness, and has good chances of getting even more. This joseki has a few variations, most of them designed to give black the possibility to end in sente. If you want to look at them, go to the advanced article on this position, ThreeThreePointInvasionJoseki.
Scartol: I apologize if this seems like a facile question, but I'm starting to get into the 3-3 invasion, and I don't know what I'm doing.
Suppose black plays the low hane instead of the high with 4. I assume white 5, but what then? Can't black come around with 6 and slam into white's corner, possibly killing it?
Adamzero: For black to make that hane is unreasonable. It could lead to many possible results, three of which I've shown, and non of which are any good for black.
The first diagram lets white make territory on the fourth line and leaves black with tons of cutting points.
The second diagram lets white live easily and gives him the aji of the clamp at a or, considering the strength of his corner, the cut at b or the hane at c if black responds to protect at d.
The third diagram leaves black with even more cutting points, and black cannot prevent white from using at least one of them, if he wishes to. JamesA: Sorry, Adamzero, but I'm not sure your analysis is correct!
I think white 5 is an overplay. Can't black cut with 6 to punish it?
White can play at 10, eliminating the cut at 'b' in your diagram, and taking away the value of 'c'. Black is now thick on the outside - I think this position is OK for black. The clamp at 'a' is a gote endgame move; if black answers with 'd', white must then play 'e'. This is only big if black tries to make territory at the top.
This sequence is more or less the same as the last. Black should finish up with 9, leaving very little aji for white. Black is pretty thick again. However, this is not as good as the joseki variations covered earlier.
Dieter 1d:
In answer to Black 3, Wite can also counter hane and leave the capture at 'a' for later. Black 5 is to prevent the cut at 'b'. After this joseki, White has nozoki at c and/or d.
Author(s): This is a copy of the living page "Three Three Point Invasion" at Sensei's Library. (C) the Authors, published under the OpenContent License V1.0. |