![]() StartingPoints Homepages
|
Holigor Fills His Own Eye
Keywords: Life & Death
Can filling your true eye be a good move in go? When I tried to program my own go-playing algorithm, I forbade the program filling its own single-point eyes. I thought that there is no harm in such a strict rule because it is impossible for filling your own eye to be a good move. How about, never fill your own eye if you already have at least 2 eyes, or there is hope of gaining another eye? HolIgor: The notion of two eyes is too difficult to program. It requires introduction of many complex notions such as a group of stones, semeai, seki, i.e. understanding of the game. One has to start somewhere and the rule of not filling a single-point true eye defined locally seemed a good start. The sad news is that with this rule the program would never see how to kill in the situation shown on the diagram. Jasonred: Man... so, you could never program it so that the com learns how to generate 2 eyes to keep a group alive? You could just kill it every time with it's lack of tsumego? Little did I know. In one of my own games I filled my own true single-point eye and that was the best move on the board.
Black is dead by virtue of a rule that a group with an eye kills a group without eyes.[1] To capture the black group White has to fill all outside liberties and then a move from inside becomes possible.
So, Black played 1 hoping to capture White's group before the liberties are filled. White has to answer with 2, filling her own eye and forming gomoku nakade also known as bulky five also known as an automobile. Unbelievable. The marvels of this game never end. [1] Not! HolIgor: Certainly, not. That's why White had to fill the eye in the example above. The correct statement is that a group with an eye can often fill one mutual inside liberty, so it has an advantage in the semeai. Dieter: No that is not the reason. In a eye versus no eye capturing race, the eye party will never have to fill an inside liberty. The correct statement is that a group with an eye counts all inside liberties if the other group has no eye.
This is a copy of the living page "Holigor Fills His Own Eye" at Sensei's Library. ![]() |