Keima side connection
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Another example: the stone connects all the white stones. See /Discussion to see the tactics behind this connection.
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?