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Reducing Strength
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Robert Houdart



Joined: 15 Mar 2010
Posts: 1251
PostPost subject: Re: Reducing Strength    Posted: Thu Mar 15, 2012 10:44 am Reply to topic Reply with quote
kinderchocolate wrote:
Other than limiting the number of nodes and depths, any suggestions on how to reduce the playing strength as realistic as possible? I've found that limiting the number of nodes isn't working very well.

Also, what'd be the best way to tune the parameters?

Houdini 2 uses the following techniques:

1) Limit the number of positions searched - this reduces mostly the tactical strength of the engine and makes the behavior independent of time control or hardware.

2) Run a hidden multi-PV analysis and purposely pick a move the engine knows is not optimal - this reduces mostly the positional strength of the engine.
This idea comes from Stockfish.

The combination of the two produces a game with both tactical and positional flaws, making Houdini 2 play human-like even at low strength levels.

Here's a reaction I got from a user: "I've played a couple of games against it and am impressed with it's play. It seems more "human" than most other programs I've played. I didn't really notice any dumb computer moves that other programs make when playing at reduced levels. It really felt like I was playing another person down at the local chess club. Now I just need to find a level that's appropriate for me."

Robert
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Subject Author Date/Time
Reducing Strength Ted Wong Thu Mar 15, 2012 12:22 am
      Re: Reducing Strength Edmund Moshammer Thu Mar 15, 2012 2:43 am
            Re: Reducing Strength Ted Wong Thu Mar 15, 2012 6:21 am
                  Re: Reducing Strength Pawel Koziol Thu Mar 15, 2012 9:10 am
                        Re: Reducing Strength Ted Wong Thu Mar 15, 2012 10:04 am
      Re: Reducing Strength Ferdinand Mosca Thu Mar 15, 2012 10:34 am
      Re: Reducing Strength Robert Houdart Thu Mar 15, 2012 10:44 am
            Re: Reducing Strength Ed Schroder Thu Mar 15, 2012 12:17 pm
                  Re: Reducing Strength Mike Robinson Thu Mar 15, 2012 1:55 pm
      Re: Reducing Strength Robert Hyatt Thu Mar 15, 2012 2:02 pm
            Re: Reducing Strength Mike Robinson Thu Mar 15, 2012 2:40 pm
                  Re: Reducing Strength Ted Wong Thu Mar 15, 2012 4:35 pm
                  Re: Reducing Strength Edmund Moshammer Thu Mar 15, 2012 5:26 pm
            Re: Reducing Strength Jon Dart Sat Mar 17, 2012 2:53 pm
                  Re: Reducing Strength Robert Hyatt Sat Mar 17, 2012 4:07 pm
                        Re: Reducing Strength Pawel Koziol Sun Mar 25, 2012 7:36 pm
                              Re: Reducing Strength Ted Wong Mon Mar 26, 2012 12:47 am
      Re: Reducing Strength Ben-Hur Carlos Langoni Sat Mar 17, 2012 3:39 pm
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