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Re: [Bug-gnubg] wasting time when a win is certain

From: Michael Petch
Subject: Re: [Bug-gnubg] wasting time when a win is certain
Date: Fri, 01 Aug 2014 23:29:18 -0600
User-agent: Mozilla/5.0 (Windows NT 6.3; WOW64; rv:31.0) Gecko/20100101 Thunderbird/31.0

On 2014-08-01 8:29 PM, Tim Leonard wrote:
> When gnubg (version 1.02.000) had a certain win in one move, it chose to 
> waste a pip, causing it to win in two moves.
> It had men on the 2 and 1 points, rolled a 5-1, chose to move the 2 to 1 and 
> cast off the 1, rather than casting off both.
> I’ve attached the game log.

What is going on is that both plays one off or 2 off still guarantee
victory. The bot sees that it has a choice between 2 moves which
guarantees a win. It happens to be that at the time of the analysis the
move that was listed first happened to be the one that takes them off in
2 rolls.

The bot didn't lose anything in doing so. I would call this a rather low
priority bug/deficiency. The question would have to be asked why the bot
didn't consult the bearoff database directly for this position.

Michael Petch
GNU Backgammon Maintainer / Developer
OpenPGP FingerPrint=D81C 6A0D 987E 7DA5 3219 6715 466A 2ACE 5CAE 3304

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