capturable-1

A string's local-1 is all its intersections.

A player's string is capturable-1 if

it is not uncapturable and
the opponent cannot force capture of the string's stones and prevent a local-1 permanent-stone of the player.

More formal versions of the definitions are in the Japanese 2003 Rules. The terms have been coined by Robert Jasiek.

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Examples

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Ordinary capture in territory

A capturable-1 string can occur in a territory region.

The marked stone is capturable-1.

In imagined hypothetical play, we study the fate of the original marked black stone.

We have Black's marked local-1 permanent-stone on the board. This proves that the original marked stone is capturable-1.

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Nakade

A capturable-1 string can occur in a nakade.

The marked stone is capturable-1.

In imagined hypothetical play, we study the fate of the original marked black stone. Further variations with e. g. White 3 at 6 can occur but Black can always eventually establish a local-1 permanent-stone at the 1-1 intersection.

Even if White continues with a - b or c - b or b - c - a - d, Black keeps the marked local-1 permanent-stone on the board. This proves that the original marked stone is capturable-1.

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Snapback

A capturable-1 string can occur in a snapback.

The marked stone is capturable-1.

In imagined hypothetical play, we study the fate of the original marked black stone.

Even if White continues at a or b, Black c keeps the marked local-1 permanent-stone on the board. This proves that the original marked stone is capturable-1.

See also under the stones and capturable-2.

capturable-1 last edited by RobertJasiek on December 16, 2019 - 12:08

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