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Three-Space Notchers
Three-space notchers are groups that consist of a chain on the second line, interrupted by a notch of three empty spaces on the second line and three stones on the third. The term was invented by James Davies. See also Notchers, One-Space Notchers and Two-Space Notchers.
Marked points: weaknesses ClassificationSee notchers for the coding. 311
Even if Black takes the vital point at 1, White first destroys eyeshape, then makes miai of A and B. With one of his weak spots occupied by White, the Black group's eyespace is almost filled with 3 in a row. Hence 311WW, 311WN and 311WS are also dead
Black 1 makes life
Black still needs to play at 1 to make life. 311 is dead, except for 311NS and 311SS, which can live 312TableSee notchers for the coding. 311WW D -- (work in progress) This is a copy of the living page "Three-Space Notchers" at Sensei's Library. (C) the Authors, published under the OpenContent License V1.0. |