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Topic: Hippo based bots discussion & chat (Read 4307 times) |
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Ikki
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Hippo based bots discussion & chat
« on: Apr 8th, 2013, 10:45am » |
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A chat for people working on a hippo base bot.
That's what I am doing. I've spent quite a lot of time understanding the code. Many things are still unclear to me but I think I know enough to start modifying the evaluate function to improve how the bot plays.
Base hippo code is here:
http://arimaa.com/arimaa/download/bot_Hippo/bot_Hippo.zip
It's written in java.
Comments, ideas, etc. are welcomed !
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Ikki
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Re: Hippo based bots discussion & chat
« Reply #2 on: Apr 8th, 2013, 1:44pm » |
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Hello Hippo,
seems that you have changed quite a lot of things ! 
You are working on a genetic algorithm ? Interesting.
I will stick on the good old version for now.  I wanna work on the evaluation function.
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Hippo
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Re: Hippo based bots discussion & chat
« Reply #3 on: Apr 8th, 2013, 4:49pm » |
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on Apr 8th, 2013, 1:44pm, Ikki wrote:Hello Hippo,
seems that you have changed quite a lot of things !
You are working on a genetic algorithm ? Interesting.
I will stick on the good old version for now. I wanna work on the evaluation function.
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The learning was there in previous version allready. Unfortunately it somehow diverged so I have stopped the developping till other features are added.
And I hope the work of my student on mobility could be used for it in foreseeable future.
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Ikki
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Re: Hippo based bots discussion & chat
« Reply #4 on: Apr 19th, 2013, 9:14pm » |
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Hi, I've a little problem. I'm working on the evaluation function (evaluate2 class). I think I understand the way the mapping is done for the pieces on the board:
stronger_or_eq_bb[7][2]
This bitboard represent que whole pieces position on the board:
stronger_or_eq_bb[1][] is for gold
stronger_or_eq_bb[0][] si for silver.
stronger_or_eq_bb[0][5] represent the stronger piece (elephant) if I am correct.
stronger_or_eq_bb[][1] represent the weakest, the rabbit.
Am I correct until now ?
Ok.
Then at the beginning of the evaluation function, there are a bunch of variable that I do not understand and are derived from the previous:
long gold_bb = gs.stronger_or_eq_bb[0][0];
long gold_nr_bb = gs.stronger_or_eq_bb[0][1];
long gold_r_bb = gold_bb ^ gold_nr_bb;
What does they stand for ?
Thanks.
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Hippo
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Re: Hippo based bots discussion & chat
« Reply #5 on: Apr 22nd, 2013, 2:45pm » |
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on Apr 19th, 2013, 9:14pm, Ikki wrote:Hi, I've a little problem. I'm working on the evaluation function (evaluate2 class). I think I understand the way the mapping is done for the pieces on the board:
stronger_or_eq_bb[7][2]
This bitboard represent que whole pieces position on the board:
stronger_or_eq_bb[1][] is for gold
stronger_or_eq_bb[0][] si for silver.
stronger_or_eq_bb[0][5] represent the stronger piece (elephant) if I am correct.
stronger_or_eq_bb[][1] represent the weakest, the rabbit.
Am I correct until now ?
Ok.
Then at the beginning of the evaluation function, there are a bunch of variable that I do not understand and are derived from the previous:
long gold_bb = gs.stronger_or_eq_bb[0][0];
long gold_nr_bb = gs.stronger_or_eq_bb[0][1];
long gold_r_bb = gold_bb ^ gold_nr_bb;
What does they stand for ?
Thanks. |
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supppose all pieces are present ...
stronger_or_eq_bb[0][0] are all gold pieces (RCDHME)
stronger_or_eq_bb[0][1] are all gold nonrabbit pieces (CDHME)
stronger_or_eq_bb[0][2] are gold pieces DHME
stronger_or_eq_bb[0][3] are gold pieces HME
stronger_or_eq_bb[0][4] are gold pieces ME
stronger_or_eq_bb[0][5] are gold pieces E
stronger_or_eq_bb[0][6] is zero
if just camels are traded
stronger_or_eq_bb[0][4] are gold pieces E
stronger_or_eq_bb[0][5] is zero
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Ikki
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Re: Hippo based bots discussion & chat
« Reply #6 on: Apr 25th, 2013, 7:08pm » |
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Thanks for your help Hippo !
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