Newsgroups: comp.ai.alife,comp.ai.genetic
Path: cantaloupe.srv.cs.cmu.edu!das-news2.harvard.edu!news2.near.net!howland.reston.ans.net!swrinde!pipex!sunic!news.chalmers.se!news.gu.se!gd-news!d6242.shv.hb.se!sa209
From: sa209@utb.shv.hb.se (Claes Andersson)
Subject: Re: Genetic Game
Message-ID: <sa209.66@utb.shv.hb.se>
Sender: usenet@gdunix.gd.chalmers.se (USENET News System)
Nntp-Posting-Host: d6242.shv.hb.se
Organization: Department of Scocial Science
References: <christian.02rw@darkin.demon.co.uk> <Cz7y6p.EoK@murdoch.acc.Virginia.EDU> <sa209.64@utb.shv.hb.se> <3a6u4s$4lc@news.nde.state.ne.us>
Date: Mon, 14 Nov 1994 17:04:21 GMT
Lines: 46
Xref: glinda.oz.cs.cmu.edu comp.ai.alife:1290 comp.ai.genetic:4266

In article <3a6u4s$4lc@news.nde.state.ne.us> jhutfles@esu3.esu3.k12.ne.us (jay w hutfles) writes:

>Claes Andersson (sa209@utb.shv.hb.se) wrote:

>:  That's not sure! The rules are the games functions and they cannot be 
>: altered by anyone else than a programmer. The fitness function is quite 
>: simple: The one who survives lives and reproduce. But I agree that there 
>: ought to be quite a large genepool or perhaps not a completely randomized 
>: seed generation.

>: Claes Andersson. University of Bors. Sweden.

>As the person you responded to said, the fitness function in the game 
>would be set by the player: if they wanted the fast aliens to survive, 
>they would kill the slow ones first.  But any smart player would kill the 
>fittest aliens first, leaving the slow, dumb ones to spawn the next 
>generation of aliens.  After a few generations, the player would have 
>evolved aliens that stayed in one spot for the whole game, like sitting 
>ducks.  Now, if the player wanted a challange, they would kill the slow 
>ones first, leaving the fast ones to reproduce.  

>I hate to have only negative comments, but how would the player win?  The 
>original space invaders ended (I assume) when the player reached a 
>certain level.  Just curious.

>Thanks for the time.

>Jay Hutfles

>No sig.--

 Well, yes.. the aliens get faster and faster. That's right as you say that 
if you kill the fittest, the least fit will survive. But you must remember 
that if the seed generation isn't completely randomized the most fit are the 
most fit just because it survives better. An ordinary space invaders game 
would be easy to fool but if you consider another situation: The player has 
an energy level that decrease for each fired shot and increase for each 
alien killed. Trying to kill of all the most fit creatures would cause more 
of your shot to miss the target and you'd have to improve your skills, one 
of these skills could very well be to identify the strongest opponont and 
tryto kill it. All of a sudden, another new dangerous trait could evolve and 
establish itself in the genepool before you'd notice it! But your quite 
right... an ordinary space invaders would either be to easy to fool or have 
a too converged population at a start to evolve very much.

Claes Andersson. University of Bors. Sweden.
