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Rectangular Six
A group with a big eye with the shape of a rectangular six, is alive except for rectangular six in the corner.
Here, the eyespace is at the side, but in the center the implications are the same. The vital points are 'a' and 'b' and they are miai:
White 2 makes miai of 'a' and 'b' to live with 6 points.
White 2 makes miai of 'a' and 'b'to live with 6 points.
If White 4 elsewhere, White is still alive but now in seki: Black can at most almost fill with a bent four. However, this seki is not valid for rectangular six in the corner. See also Comb Formation. This is a copy of the living page "Rectangular Six" at Sensei's Library. (C) the Authors, published under the OpenContent License V1.0. |