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Checking Extension
Keywords: Go term
A checking extension (translates the Japanese tsume) is an extension with 'added value'. This 'added value' may take a number of forms, for example an implied invasion or a threat to the base of a group.
Here Black 1 aims at an invasion next at a.
In this case White's response to Black 1 is entirely natural: allowing Black the big, attacking play at b would be a major loss.
Both of these are examples of checking extensions by Black. In the second case we can assume Black's play is sente; but not in the first. To qualify an extension must at least be 'almost sente', in the sense of having a major follow-up. This is a copy of the living page "Checking Extension" at Sensei's Library. ![]() |