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Re: [Bug-gnubg] Confused

From: Lucas
Subject: Re: [Bug-gnubg] Confused
Date: Fri, 12 Jun 2015 11:35:18 +0200

Hi Ian

To say that gnubg expert level plays less then worldclass or makes mistakes might not be true I did run on local disk expert against worldclass 1000 5 point matches the result was
worldclass  had a winrate of 50,2 % . To me that 0,2 % might be due to luck.
I agree that expert plays sometimes a different move compared with worldclass on the same
position etc

Assuming that a higher level of gnubg wil play better then lower level is not true.
Last year i tested using Fibs,( were i did in the past 8 bots), 2 bots
one set to play Worldclass and the other at grandmaster
so 2 ply against 3 ply
they played 3000 5 point matches
Worldclass the lesser setting had a winrate of 55 %
I mailed about it with Micheal Petch
one of the maintainers of gnubg and
he confirmed that indeed worldclass plays better the Grandmaster



-----Oorspronkelijk bericht----- From: Ian Shaw
Sent: Thursday, June 11, 2015 6:22 PM
To: Michael Brennan ; address@hidden
Subject: Re: [Bug-gnubg] Confused

Hi Michael,

Welcome to GNU Backgammon.

1) Dice are no respecter of ability! Even the best players can be defeated by bad rolls. Look at the Luck ratings to see how gnubg thinks it played out.

Gnubg thinks it made no errors because it is using itself as the best judge of perfection!

If you ask gnubg to play on Expert Level but analyse on World Class, you will start to see some errors creep into its game.

2) It depends on how beginnerish you are.

According to the FIBS Rating Calculator at http://www.netadelica.com/bg/fibscalc.html a player with a 500 point Elo advantage should win a 13-point match about 89% of the time. This increases to 93% for a 21-pointer.

You can play with the calculator yourself for other scenarios. (The experience fields should be set to at least 400 for both players.)

I hope this helps.
Ian Shaw

-----Original Message-----
From: address@hidden [mailto:address@hidden On Behalf Of Michael Brennan
Sent: 11 June 2015 00:19
To: address@hidden
Subject: [Bug-gnubg] Confused

I would be obliged for some help on the following. Please forward it on to someone who could answer if it arrives at the wrong destination.

gnubg describes my ability as a “beginner" - fair comment. However in a 13pt match, I beat gnubg 13-6. The analysis described gnubg’s ability as “supernatural" and indicated that it made no errors.

I Have two queries in relation to this

1. How come gnubg lost?

2. How many points should a match be in order to ensure that gnubg wins every time against a beginner?


Michael Brennan
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