Big Sacrifice To Get A Wall
There is a rather standard sacrifice that comes up in several situations, which allows someone to build an impressive wall. The basic shape is this one:
White sets up a semeai with the geta . The marked white stones are the sacrifice, they do not have enough liberties to the left to win the semeai.
There is either already a white stone at a, or white can add it in sente, so that black cannot break out of the geta
The end result will give white an impressive wall.
Table of contents |
Real life applications
Nineteen point trick play
One of the most famous examples is the 19 point trick play:
is the trick play. - fall for it. kills the corner, but that was black's intent all along. Black sacrifices and ends up with an impenetrable wall. is usually not urgent, and black can keep it in reserve as a ko threat. |
4-4 ogeima enclosure
This same sacrifice pattern is found in this standard 4-4 enclosure
is a standard invasion when black has nearby support. goes all out to capture black, but that is what black was waiting for. After , the position starts Note: At , white cannot break out into the center because of the black atari at a. |
3-4 high approach, keima joseki
The pattern occurs often with invasions of large knight move enclosures:
Another standard joseki situation. Again, the presence of the marked black stone makes the invasion possible. The further pattern should be familiar by now. EDIT: It looks like this section is wrong and the sacrifice technique doesn't actually work. See the discussion page. |
3-4 high approach, one point jump joseki
Another joseki variant, similar to the one above. Because of the low position of the marked stone, black cannot squeeze by cutting at , but is still quite effective. As always, is not urgent and can be kept in reserve. EDIT: It looks like this section is wrong and the sacrifice technique doesn't actually work. See the discussion page. |