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Topic: bot_bomb update (Read 5785 times) |
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fotland
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bot_bomb update
« on: Nov 13th, 2004, 12:44am » |
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bot_bomb is much stronger now.
I have two versions of bot_bomb. I developed it as a windows program with a GUI and many debug features. Getmove.exe just used pipes to communicate file names to the gui program.
Right before the match last January, I ported it to Unix, which meant creating a getmove.exe that does the search, without a gui, and only uses Unix APIs.
I've been using the unix code, running on Windows for the last week or so it has been on the server. But it seemed to be playing much weaker moves than I expected, and its rating was dropping steadily.
Today I figured out why. The Unix version had a bug that was disabling the goal search and some of the complex evaluation terms.
It's fixed now, and should be noticably stronger.
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99of9
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Re: bot_bomb update
« Reply #1 on: Nov 13th, 2004, 7:33am » |
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Ahh that explains it. I'll be interested to give the real bomb a spin sometime soon. Do you mean that even the version that played Omar in the challenge was handicapped
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| « Last Edit: Nov 13th, 2004, 7:34am by 99of9 » |
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fotland
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Re: bot_bomb update
« Reply #2 on: Nov 13th, 2004, 9:33am » |
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I don't think the version that played Omar last year was handicapped. When I made the commercial version I added some parameters to the evaluation to optionally weaken it so beginners would have a fun game. The unix version didn't initialize them properly.
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Fritzlein
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Re: bot_bomb update
« Reply #3 on: Nov 13th, 2004, 10:58am » |
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Ha ha! Was Bomb's evaluation function set to "medium" or "weak"?
It reflects badly on me that I was so eager to conclude that I had gotten better rather than Bomb weaker.
OK, now we start over. I can hardly wait to see if any of the strategies that recently worked against Bomb still work now. I may lose a few rating points finding out. 
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fotland
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Re: bot_bomb update
« Reply #4 on: Nov 13th, 2004, 6:34pm » |
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The evaluation was set to medium, and it had 1% chance to throw away any move at the first step without looking at it.
Tomorrow I should have a version that won't let the elephant be smothered.
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omar
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Re: bot_bomb update
« Reply #5 on: Nov 14th, 2004, 11:03pm » |
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In the one game that I played it so far since it's been on again, it did feel like a lot weaker than the version I played against in Feb 2004.
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fotland
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Re: bot_bomb update
« Reply #6 on: Nov 15th, 2004, 12:00am » |
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New Update Sunday evening right before F's game. Fixed some evlauation bugs, added evaluation to maintain access to center for Elephant, and made big changes to the static exchange evaluator.
With luck it is stonger, but who knows until there are some test games. Let me know if it seems stronger.
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fotland
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Re: bot_bomb update
« Reply #7 on: Nov 16th, 2004, 9:32am » |
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I updated bomb. The change I made Sunday encouraged it to give up rabbits and cats to keep the enemy elephant tied up. It should be better now.
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fotland
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Re: bot_bomb update
« Reply #8 on: Nov 17th, 2004, 2:20am » |
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New version. It was valuing long range weak threats to trap a piece high than rabbits.
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fotland
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Re: bot_bomb update
« Reply #9 on: Nov 19th, 2004, 12:16am » |
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New version. Fixed lots of trap evaluation bugs.
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fotland
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Re: bot_bomb update
« Reply #10 on: Nov 23rd, 2004, 2:16am » |
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new version (speedy). More pruning, cut nodes by factor of 2 to 8. It will search deeper, but it will also miss some things when evaluation has a bug.
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fotland
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Re: bot_bomb update
« Reply #11 on: Nov 25th, 2004, 4:42pm » |
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New speedy. cut node count again, fixed some eval bugs.
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fotland
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Re: bot_bomb update
« Reply #12 on: Nov 27th, 2004, 2:24am » |
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New version. Fixed some search bugs that caused strange moves. Node count is down again. It generally finds 12 step goals in under a second now, and 16 step goals average about 20 seconds.
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fotland
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Re: bot_bomb update
« Reply #13 on: Nov 28th, 2004, 1:49am » |
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New speedy. Adjusted threat values. In some situations it valued a threat higher than the piece, so it would try to keep the piece threatened without taking it off the board.
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PMertens
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Re: bot_bomb update
« Reply #14 on: Nov 28th, 2004, 3:51pm » |
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Actually that might even be a good idea against a bot.
Especially if the threat can be easily maintained ...
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