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Yurumi Shicho
    Keywords: Attack & Defence, Tesuji, Tactics, Go term

In a yurumi shicho (loose ladder) the stones to be captured have at most three liberties (in place of at most two, in a ladder).

[Diagram]
Diag.: Black to play.

Can Black capture the marked white stone?


[Diagram]
Diag.: Yurumi shicho


Q: Is this something different from geta?

--Stefan

BillSpight: Interesting question. :-) I suppose you could consider it a kind of geta, but it's more specific.

[Diagram]
Diag.: Geta

Black 1 is a net, but not a loose ladder.



DieterVerhofstadt:

The way I see it, is that a shicho is a capturing technique where the liberties of the chased chain flip between one and two until the defending side is unable to raise the liberties to two again.

A yurumi shicho would follow exactly the same definition, replacing 1 by 2 and 2 by 3 respectively.

A geta on the other hand is a capturing technique so that the liberties of the chased chain can't be increased by the defender's next move.

This contradicts Bill's statement above, but I'm ready to adopt another viewpoint on these definitions.

[Diagram]
Diag.: geta 1

[Diagram]
Diag.: geta 2

Both basic examples of geta meet my definition.



jvt: Your definition is too restrictive. (Example moved to Geta example 7.)

(Well if it is a ladder it is not a geta!)

jvt: A successful loose ladder always ends in a ladder (in order to decrease the liberty count from three to zero, you have to go through a stage of 1/2 liberties).


Bill: One thing that a yurumi shicho and a shicho share, that a geta does not, is that they each reduce the liberties of the chain of stones to be captured by one with each play. In a shicho each play is an atari. The typical play in a yurumi shicho is not.




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