Forum Archive :
GNU Backgammon
I have used Snowie for years as my main option for analyzing match's and
rollouts etc. I have had Gnu as well for years just mainly as another
option. GNU for me is more effective speed wise in terms of delivering a
fast result and fairly accurate etc..
My question is: What settings do you use for rollouts with gnu? What MET
should I use? I currently have it set as G11.
BTW I have been to http://www.bkgm.com/gnu/AllAboutGNU.html and have seen
his suggestions. I am just wondering if these are accurate enough in your
opinion.
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Daniel Murphy writes:
My default rollouts settings that I use for 95% of my rollouts are:
* Trials -- depends on how close the plays are and how accurate I want
the equities to be. You can judge from the evaluations how many trials
might be needed. I run a minimum of 108 trials and usually 324, 648,
1296 or more, but I would emphasize that you do not need to run 1296
trials of every rollout and it's really not necessary that the number
of trials is divisible by 36. In a rollout I'm looking for a JSD of 3.
Once I get that, more trials are extremely unlikely to change the
decision and will only make the equities more accurate.
* Truncation OFF
* Evaluation for later plies OFF
* Stop when result is accurate OFF
* Stop rollouts of multiple ... OFF
* Cubeful ON
* Variance reduction ON
* Quasi-random dice ON
* Rollout as initial position OFF
* Cube decisions same settings OFF
* Use same settings for both players ON
* Use player0 setting for truncation point ON
* Checker play: 2-ply
* Cube: 2-ply
* Use neural net pruning ON
* Cubeful checker evaluation ON
* Move filter NARROW
* MET = G11
Albert's suggestions at AllAboutGNU are reasonable. I agree that "0-ply
checker play is indeed extremely strong" and since it is fast it gets
results in good time but since I usually weigh accuracy more heavily than
speed I do not agree that 0-ply is "usually ideal for full rollouts." I
don't use 0-ply checker play except for simple noncontact positions and
never use 0-ply cube. Even in the simplest of contact positions, like a
bearoff against checkers on the roof, 0-ply and 2-ply GWCs may differ by 1%
or more. Albert's "third setting" recommendations are o.k. The Ians'
rollouts with "separate evaluations" enabled changing to 0-ply checker play
after 12 plies have usually gotten good results compared to full 2-ply
rollouts but if the position is likely to be complex after 12 plies then a
full 2-ply rollout would be a better choice. I have found that there is
very little difference in results between 2-ply with Narrow, Large (world
class) and Huge (supremo) move filters.
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GNU Backgammon
- Analyzing GamesGrid matches (Roy Passfield, Dec 2001)
- Batch analysis tool (Øystein Johansen, June 2004)
- Cache size (Ned Cross+, Mar 2004)
- Compiling for Windows (Øystein Johansen, Jan 2002)
- Edit mode removing checker from bar (Scott Steiner+, May 2003)
- Entering an annotated match (Albert Silver, Dec 2003)
- Error rates: Gnu vs. Snowie (Raccoon, Mar 2006)
- Even-ply/odd-ply effect (Raccoon, Nov 2004)
- Even-ply/odd-ply effect (Tom Keith+, Oct 2003)
- Even-ply/odd-ply effect (Scott Steiner+, Dec 2002)
- Filter settings (Robert-Jan Veldhuizen, Nov 2004)
- Gnu 0.13 versus Jellyfish and Snowie (Torsten Schoop, Aug 2003)
- Gnu 0.13 vs. Snowie 4 (Albert Silver, June 2003)
- Gnu 0.14 vs. Jellyfish (Michael Howard+, July 2003)
- Gnu versus Snowie and Jellyfish (Michael Depreli, Oct 2005)
- How luck factor is calculated (Gregg Cattanach, Aug 2002)
- How rollouts work (Gary Wong, July 1999)
- How to enter an illegal move (Øystein Johansen, Aug 2003)
- Importing .gam files (PAR+, Mar 2005)
- Importing PartyGammon matches (rew+, July 2006)
- Improving your game using GnuBG (D.U.G.+, Nov 2002)
- Installing on Windows (maareyes, Oct 2001)
- Interpreting JSD's (Adrian Wright+, Feb 2005)
- JSD's and confidence intervals (Daniel Murphy+, Jan 2005)
- Logging rollouts (Øystein Johansen, Oct 2004)
- Luck rate (Kees van den Doel+, May 2002)
- MWC versus Equity (EMG) (Ken+, Apr 2005)
- Manually entering first roll (Andreas Graf+, Apr 2005)
- Match equity tables (Raccoon, July 2005)
- Personal reflections (Louis Nardy Pillards, Sept 2002)
- Playing two computers against each other (Stanley E. Richards+, Mar 2008)
- Python scripting (Øystein Johansen+, Nov 2004)
- Quasi-random dice in rollouts (Ian Shaw, Mar 2004)
- Question marks in game list (Jim Segrave, July 2005)
- Questions and answers (Jim Segrave+, Jan 2003)
- Questions and answers (Jørn Thyssen, Aug 2002)
- Restarting a rollout with different settings (Jim Segrave, Apr 2005)
- Restarting a rollout with different settings (Robert-Jan Veldhuizen, Apr 2004)
- Rollout settings (geoff arnold+, Apr 2007)
- Rollout settings (Stick+, Nov 2005)
- Rollout settings (Robert-Jan Veldhuizen, Mar 2004)
- Rollout settings (Ian Dunstan, Aug 2003)
- Rollout settings for the impatient (Robert-Jan Veldhuizen, June 2004)
- Running rollouts in background (Bruce+, Apr 2004)
- Saving rollout results from command-line interface (Jeremy Bagai+, Apr 2006)
- Saving rollouts (Mislav Radica+, May 2006)
- Setting GnuBG's playing strength (JP White, Sept 2001)
- Setting skill level (Jim Segrave, Apr 2004)
- Setting up and saving a rollout (Albert Silver, Dec 2003)
- What's GNU? (Gary Wong, Oct 2001)
- Which player is player 0? (Neil Kazaross+, Oct 2004)
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