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Yurumi Shicho
Keywords: Tesuji, Attack & Defence, Tactics, Go term
In a yurumi shicho (loose ladder) the stones to be captured have at most 3 liberties instead of 2.
Can Black capture the marked White stone?
Q: Is this something different than geta? --Stefan
BillSpight: Interesting question. :-) I suppose you could consider it a kind of geta, but it's more specific.
B 1 is geta, but not yurumi shicho. The way I see it, is that a shicho is a capturing technique where the liberties of the chased chain flip between 1 and 2 until the defending side is unable to rise the liberties to 2 again. A yurumi shicho would follow exactly the same defintion, 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.
Both basic examples of geta meet my definition. jvt: Your definition is too restrictive. I have seen a series of geta problems like the one below on a Japanese web site :
Even though it does not prevent White from increasing its number of liberties, 5 prevents White from escaping.
White 10 at 1. Then White is caught in a ladder (Black 11 at A). (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 3 to 0, 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 1 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. (C) the Authors, published under the OpenContent License V1.0. |