Keima side connection
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Ear-reddening game, move 137
Here , which is a keima in relation to both the stones - is a tesuji for safely connecting the two groups. The move is an application of watari and dropping back. It is also known as keima watari.
Another example: the stone connects all the white stones. See /Discussion to see the tactics behind this connection.
Example of application in a game situation
After , is normal (Even a moron connects against a peep). But what if black tries to split with at ?
is a mistake, unless the top side is so valuable to Black as to compensate for the complete loss of the corner. After the sequence up to , white has connected under with the keima connection.
Don't forget that black can meaningfully cut at C17. If white blocks at C16, black can stand up at C18 and kill the 5 stones --gnostic?
kb: gnostic?: You're missing @ , then and a are miai for a White connection. See the second example in Dropping Back.
Similar shape in ear-reddening game
Patrick Traill: What about the similar shape of move 137 in the ear-reddening game, as below? Is this a (more or less) common way of connecting, or does it only work because of something about the white stones below?
- N.B. This probably belongs on a page of its own, if there is none yet.
This is the same dog-leg shape, but out in the middle of the board. There is no comment on this move in Invincible, which calls “the second brilliant move adjacent to the tengen” (the first being the ear-reddening move itself, ).