[Bug-gnubg] Odd Cube analysis

[Albert Silver]

Hi,

        I did a rollout of Neil's benchmark 1-3 backgame position and
got the *strangest* results.

Position ID: 2LYBCDPOewMAAA Match ID: cAkAAAAAAAAA
Pip counts: Blue 54, White 170

Cube analysis
Rollout cubeless equity  +0.876

Cubeful equities:
1. No double            +0.892
2. Double, pass         +1.000  ( +0.108)
3. Double, take         +0.889  ( -0.003)
Proper cube action: No double, take (2.5%)
Rollout details:
Centered 1-cube:
   65.4%  46.7%  10.0% -  34.6%   0.0%   0.0% CL  +0.322 CF  +0.892
 [  0.1%   0.1%   0.0% -   0.1%   0.0%   0.0% CL   0.002 CF  +0.008]
Player White owns 2-cube:
   57.3%  37.7%   9.9% -  42.7%   0.0%   0.0% CL  +1.244 CF  +0.889
 [  0.3%   0.3%   0.2% -   0.3%   0.0%   0.0% CL   0.015 CF  +0.023]
Full cubeful rollout with var.redn.
1296 games, seed 1196666624 using quasi-random dice and Mersenne Twister
Play: 0-ply cubeful [expert]
Cube: 1-ply cubeful

You'll note that it shows a cubeless equity of +0.876 in a money game,
with the Jacoby ON, and declares it to be a ... NO DOUBLE/TAKE??? :-) 

                                                Albert