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Hoyle

HOYLE [\protect\citenameEpstein, 1989b] is a program, similar in spirit to METAGAMER, in which general knowledge is encapsulated using the metaphor of advisors. HOYLE has an advisor responsible for guiding the program into positions in which it has high mobility. However, HOYLE does not analyse the rules of the games it plays, and instead uses the naive notion of immediate-mobility as the number of moves available to a player in a particular position. The power of material values is that they abstract away from the mobility a piece has in a particular position, and characterise the potential options and goals which are furthered by the existence of each type of piece, whether or not these options are realised in a particular position. As HOYLE does not perform any analysis of the rules or construct analysis tables as does METAGAMER, it is unable to benefit from this important source of power.