Rodent III personalities <2000 Elo?

[PeterO]

Hi,

I am VERY interested in the Rodent III personalities! Has anybody designed weaker personalities - under Elo 2000?


Peter

[PK]

https://github.com/nescitus/Rodent_III/ ... sonalities

see "club" and "league" folders

[PK]

In general, Rodent achieves weaker play by (1) slower nodes per second and (2) adding pseudo-random factor to evaluation function (based on hash keys for consistency, but modified from game to game to avoid repetitiveness). Relevant functions are EloToSpeed() and EloToBlur() in params.cpp.

[PeterO]

Hi Pawel,
Thanks for your answer! I read your manual carefully. You wrote NPS about 5000 purs Rodent somewhere within 1600-1800 elo range - I understand this is NOT an exact number. But is this number independent of the hardware used?
You wrote the 2 main factors to weaken the engine are NPS and EvalBlur - I have no idea whta EvalBlur means - wich number do you recomend to set for EvalBlur to reach 1700, 1900, 2000 Elo?

Peter

[PK]

EvalBlur is pseudo-random factor added to eval. In general, I do not use it for personalities above 1500 Elo, with one funny exception: "Drunk" personality with EvalBlur of 500 and unrestricted search.

NPS to Elo ratio for Rodent will never be exact, because eval tweaks also change Elo, often in a strange way. For example, weak personalities gain from exaggerated aggresion, while strong ones do not.

Also, I forgot to mention that Rodent is able to respond to UCI_Elo command.

[PeterO]

Hi Pawel,

„Also, I forgot to mention that Rodent is able to respond to UCI_Elo command.“

Thats interesting - that means:
1. I dońt have to change EvalBlur creating personalities above 1500 Elo.
2. I can create personlities how I like them and dont change NPS. Instead I can simply set the Elo in the UCI options? Do I understand you correctly - I would prefer this way (using the GUI)to weaken the engine.

Peter