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Re: [Bug-gnubg] 0ply doubles early

From: Massimiliano Maini
Subject: Re: [Bug-gnubg] 0ply doubles early
Date: Thu, 14 Dec 2006 17:32:19 +0100

>On gammonline "Stick" claimed that 0ply doubled early. That came as a
>bit of a surprise to me, so I set gnubg up to play expert/expert.
>After around 20000 games gnubg had used more than half of the
>computers memory and I cancelled the match at that point. Then I did a
>2ply analysis of the cube actions only. The statistics is striking,
>Almost a third of 0ply's doubles are considered early and the ratio
>(early doubles):(missed double takes) is 10:1. The cube action of 0ply
>is still excellent though.
>Perhaps all this is just a manifestation of gnubg 0ply overestimating
>the equity of the player on roll, but I still found it interesting.

Could that be caused by the fact that 0-ply cannot 'see' the
absence of market-losers (and hence doubles when it shouldn't
since in any case next turn is not gonna be a double-drop) ?

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