Re: [Bug-gnubg] Doubling Criteria

[Joern Thyssen]

On Mon, Nov 25, 2002 at 04:16:18AM -0500, address@hidden wrote
> Hi 
> Can you tell me (at this stage in non-mathematical terms) how GNUBG decides
> whether a position is a double and is this different at 0 ply 1 ply and 2 ply?

At 0-ply it converts the cubeless equity to a cubeful one by applying
Janowski's formulae. Higher ply is just averaging over all 21, 441, ...
posible rolls (and all possible cube positions).

A 0-ply cube decision is basically determining whether you're far enough
into the doubling window. At 1-ply you see market losers, and 2-ply is
basically comparing doubling now with doubling next roll. 3-ply and
higher is equivalent to 2-ply except that the equity for doubling next
time is calculated on a higher level. At 4-ply you also see the equity
for doubling two rolls into the future.

I recommend at least 2-ply for cube decisions.

Jørn

-- 
Joern Thyssen, PhD
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