[Bug-gnubg] rollout settings

[max-d]

hi
in this position GnuBg did disagree with my move (Wc++ analysis)
while 360 rollouts agree .
Can anyone give a short explanation (or links) for the rollout parameters :

Full cubeless rollout without var.redn., with rotate rolls ????

I have vague idea what  variance reduction is but never heard about
rotate rolls.

when analysing a whole match ,what is the optimal rollout settings ?
I suppose all that has already be described but i missed the threads .
sorry and thanks !
md .

mgnu_advanced (O, 0 pts) vs. You (X, 0 pts) (Match to 3)

Game number 1

Match Information:

mgnu_advanced's rating: n/a
You's rating: n/a
Date: n/a
Event: n/a
Round: n/a
Place: n/a
Annotator: n/a
Comments: n/a
Move number 2: X on roll, cube decision?

 GNU Backgammon  Position ID: 4HvBATDgc/ABMA
                 Match ID   : cAlgAAAAAAAA
 +13-14-15-16-17-18------19-20-21-22-23-24-+     O: mgnu_advanced
 | X           O  O |   | O              X |     0 points
 | X              O |   | O              X |
 | X              O |   | O                |
 | X              O |   | O                |
 | X                |   | O                |
v|                  |BAR|                  |     3 point match (Cube: 1)
 |                  |   | X                |
 |                  |   | X                |
 | O           X    |   | X                |
 | O           X    |   | X              O |     On roll
 | O           X    |   | X              O |     0 points
 +12-11-10--9--8--7-------6--5--4--3--2--1-+     X: You

* You moves 13/11 13/7

Cube analysis
2-ply cubeless MWC  48,64% (Money:  -0,115)
  0,460 0,118 0,004 - 0,540 0,151 0,006
1. No double            48,21%
2. Double, pass         59,85%  (+11,64%)
3. Double, take         42,87%  ( -5,34%)
Proper cube action: No double, take (31,5%)
Alert: bad move (+0,000%)

Rolled 26 (-0,841%):
*    1. Rollout          13/11 13/7                   MWC:  47,21%
       0,433 0,092 0,000 - 0,567 0,164 0,014 CL  47,21%
      [0,026 0,015 0,000 - 0,026 0,020 0,006 CL   0,85%]
        Full cubeless rollout without var.redn., with rotate rolls
        360 games, seed 1150574724 using ANSI
        Play and cube: 0-ply cubeless
     2. Rollout          24/16                        MWC:  46,96% ( -0,25%)
       0,408 0,111 0,006 - 0,592 0,181 0,011 CL  46,96%
      [0,026 0,017 0,004 - 0,026 0,020 0,006 CL   0,89%]
        Full cubeless rollout without var.redn., with rotate rolls
        360 games, seed 1150574724 using ANSI
        Play and cube: 0-ply cubeless
     3. Cubeful 2-ply    13/5                         MWC:  46,61% ( -0,60%)
       0,428 0,111 0,004 - 0,572 0,170 0,009
     4. Cubeful 2-ply    24/22 13/7                   MWC:  46,58% ( -0,63%)
       0,428 0,108 0,004 - 0,572 0,174 0,006
     5. Cubeful 2-ply    13/7 6/4                     MWC:  45,51% ( -1,70%)
       0,409 0,098 0,003 - 0,591 0,189 0,011


Output generated Tue Oct 29 08:40:20 2002
by GNU Backgammon 0.12 (Text Export version 1.23)