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Re: [Bug-gnubg] Confused

From: Ian Shaw
Subject: Re: [Bug-gnubg] Confused
Date: Thu, 11 Jun 2015 16:22:27 +0000

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 

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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