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   Author  Topic: bot_Ananas  (Read 236 times)
Max2
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Arimaa player #11183

   


Gender: male
Posts: 13
bot_Ananas
« on: Aug 16th, 2020, 1:30pm »
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bot_Ananas (german for "pineapple") is the result of a letter recombination from:
Arimaa palying bot, using a neural network
 
This bot be trained from human games and bot games.
 
One goal of bot_Ananas will be, to give the Arimaa community a handicap playing bot.
« Last Edit: Aug 22nd, 2020, 2:55pm by Max2 » IP Logged
Max2
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Arimaa player #11183

   


Gender: male
Posts: 13
Re: bot_Ananas
« Reply #1 on: Aug 16th, 2020, 1:30pm »
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Handicap games work this way:
bot_Ananas always plays as Gold an will have less pieces than normal.  
The player plays always as Silver and will have all pieces.
 
Befor the game starts, the player chooses which handicap he wants to play.
e.g. a Rabbit handicap means, the bot will only have 7 Rabbits (1 Rabbit less than normal)
 
In bot_Ananas's first move (after the setup phase), it will sacrifice the 1, 2 or 3 handicap pieces.
After that, the player starts the game with his regular first move.
 
bot_Ananas's sacrifice move will always have the same move order, so the player in his setup phase already can respond to the Gold setup perfectly. The next paragraph shows this order.
« Last Edit: Aug 22nd, 2020, 2:56pm by Max2 » IP Logged
Max2
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Arimaa player #11183

   


Gender: male
Posts: 13
Re: bot_Ananas
« Reply #2 on: Aug 16th, 2020, 1:48pm »
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This picture shows the steps, bot_Ananas will always play.
On the left you see an example setup and on the right, how this setup looks after the sacrifice move.
https://abload.de/img/handicapmovesouk4b.jpg
 
Also without the picture, the moves are easy to remember:
From left to right (reading order), the pieces directly behind the traps are sacrified and if there are steps left to use, the pieces from the last row replace the sacrified pieces.
« Last Edit: Aug 16th, 2020, 2:12pm by Max2 » IP Logged
Max2
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Arimaa player #11183

   


Gender: male
Posts: 13
Re: bot_Ananas
« Reply #3 on: Aug 16th, 2020, 2:09pm »
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I want bot_Ananas at least to offer this handicaps:
- (no handicap)
R
RR
RRR
C
CC
D
H
M
E
 
Which other 2 or 3 pieces handicaps do you want to see?  
 
What do you think, at a 2 min/move tournament:
With which handicap the best bot has no winning chance against the best human?
With which handicap the best bot is about even against the best human?
With which handicap the best human has still no winning chance against the best bot?
« Last Edit: Aug 16th, 2020, 2:18pm by Max2 » IP Logged
Max2
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Arimaa player #11183

   


Gender: male
Posts: 13
Re: bot_Ananas
« Reply #4 on: Aug 24th, 2020, 11:36am »
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bot_Ananas also uses many handcrafted features, e.g.
- guaranteed execution of Win-in-1 (it could be annoying without this feature)
- special reactions to Loss-in-1
- immediate move in winning repetition fights
- prevention of complete board clearing (opponent cannot get rid of all pieces on game ending move)
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Max2
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Arimaa player #11183

   


Gender: male
Posts: 13
Re: bot_Ananas
« Reply #5 on: Aug 28th, 2020, 7:06pm »
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Version log from bot_Ananas:
 
V0.1
25.08.2020 able to play in the gameroom
29.08.2020 all handicap types can be started from random setups
 
For next version, machine learning will be added.
« Last Edit: Aug 28th, 2020, 7:07pm by Max2 » IP Logged
ajzaff
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Arimaa player #11871

   


Gender: male
Posts: 3
Re: bot_Ananas
« Reply #6 on: Sep 9th, 2020, 4:55pm »
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That's a great idea! Did you turn off strict setup in cameroom.cfg to achieve this? I wonder if you ran into any problems? How can I play?
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Max2
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Arimaa player #11183

   


Gender: male
Posts: 13
Re: bot_Ananas
« Reply #7 on: Sep 12th, 2020, 5:29pm »
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on Sep 9th, 2020, 4:55pm, ajzaff wrote:
Did you turn off strict setup in cameroom.cfg to achieve this? I wonder if you ran into any problems?

 
I did not know of the "strict setup" feature and also will not use it in the future.
 
Ananas plays a normal game as Gold but sacrifies the pieces with its first move. Here is an example of a 1-Rabbit-handicap game it played today:
http://arimaa.com/arimaa/gameroom/opengamewin.cgi?client=1&gameid=63 6804&role=v&side=w
 
on Sep 9th, 2020, 4:55pm, ajzaff wrote:
How can I play?

 
The game I gave as an example is one of the best games of Ananas at the moment. So playing it is not fun.
When Ananas got stronger, there will be open games in the lobby for humans/bots to join.
 
 
« Last Edit: Sep 12th, 2020, 6:26pm by Max2 » IP Logged
Max2
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Arimaa player #11183

   


Gender: male
Posts: 13
Re: bot_Ananas
« Reply #8 on: Sep 12th, 2020, 5:40pm »
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V0.2
12.09.2020  
Machine Learning (ML) is added: a position can get an automatic value.
Therefore a neural net was trained with half a million positions, played in the gameromm by humans or bots.
 
The ML search uses Breadth First Search and checks all positions after ply 1 (P1; 4 steps).
The "good" play at the end of the games (see link one post above) comes from the handcrafted features which add a bit P2/P3.
 
Current stand of problems:
There might be many bugs. Of course, the Breadth First Search is very slow in open positions with many pieces.
 
-> Ananas will not be available for playing in the next time, until some of the problems will be solved.
 
« Last Edit: Sep 13th, 2020, 1:04pm by Max2 » IP Logged
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