On Fri, Aug 7, 2009 at 5:51 AM, Folkert van Heusden <folk...@vanheusden.com>wrote:
> >> What is superko? > >> My program keeps a list of all board-positions and then if it whants to > >> do a move it checks if the new board-position is in the list. If so, it > >> throws that move away. Are there other checks I need to do as well? > > > > Superko involves repeating a previous board position. Various forms of > > this are forbidden by various rulesets, see > > http://www.britgo.org/rules/compare.html#threeKK > > What you are doing ensures that your program will never violate any form > > of the rule. > > Ah ok! > Odd is though that CGOS complains about Illegal KO attempted. Many time CGOS has been accused of calling a move illegal that wasn't - due to the KO rule. But so far it has never once been wrong when closely inspected. So I challenge you to show me a position where CGOS got this rule wrong! I'll give you a small monetary prize if you can :-) Just give the CGOS game number. Please note that the KO rule CGOS uses does NOT consider side to move. For example if the same exact board configuration repeats that has occurred previously, it is a positional superko violation regardless of which color is to move. Note that this is different than repetition in chess, where the same side must be on the move before consider the position as repeated. Also please note that when you play go there are other ways to define what a KO violation is. Players must agree to use the same rules when you sit down to play any game. CGOS uses the "positional superko" KO rule but it's also possible to play a game of go with the "situational superko" rule defined - which DOES take into consider the side to move. You can find disscussions on situational vs positional superko in the archives and on the web in other places - essentially there are some who feel the situational rule is more correct and more fundamental. I agree and I consider positional superko a slight complication (although by definition it is slighly simpler.) However, even though I feel that way, I chose positional superko for CGOS because I think it is more standard and accepted. - Don > > > Folkert van Heusden > > -- > Multitail es una herramienta flexible que permite visualizar los "log > file" y seguir la ejecución de comandos. Permite filtrar, añadir > colores, combinar archivos, la visualización de diferencias (diff- > view), etc. http://www.vanheusden.com/multitail/ > ---------------------------------------------------------------------- > Phone: +31-6-41278122, PGP-key: 1F28D8AE, www.vanheusden.com > _______________________________________________ > computer-go mailing list > computer-go@computer-go.org > http://www.computer-go.org/mailman/listinfo/computer-go/ >
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