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CuttingTheTrapezium

 

Trapezium shape
    Keywords: Shape

[Diagram]
Trapezium

The black stones have the shape of a trapezium.


[Diagram]
Trapezium

If the marked stone were at a, the trapezium would become a bamboo joint. Usually, one sees this shape in amateur games as an attempt to connect and move faster than the bamboo joint. However, one rarely sees it in pro games and that because it is not such a good shape. Here are the weaknesses.


[Diagram]
Weakness 1

Firstly, the diagonal in this shape can be compromised by W1. If Black next makes a bamboo joint at a, his marked stone becomes an empty triangle.


[Diagram]
Weakness 2

Secondly, in this case the trapezium can be cut.Try to spot the weakness and verify at cutting the trapezium.



This is a copy of the living page "Trapezium shape" at Sensei's Library.
(OC) 2003 the Authors, published under the OpenContent License V1.0.