Forum Archive : Opening Rolls

Rollouts: Expert Backgammon From:   Tom Fahland Address:   fahland@fnald0.fnal.gov Date:   3 August 1994 Subject:   ROLLOUTS OF OPENING MOVES FROM EXPERT BG(2.1) Forum:   rec.games.backgammon Google:   31odn4$h6o@fnnews.fnal.gov Well here is an intersting brief summary of a very thourgh rollout done by expert backgammon. I am just quoting the results that were performed by Jerry Godesy that were published in the chicago point newslettter. # of rollouts was very large-- 27,216 for each move, thus very small stastical error 1. 2-1 is only roll were all moves give negative equity 2. best equity for 4-1, 4-3 is moving both back men up, how many do this? 3. slotting with 2-1, 4-1, 5-1 gives worst equity. 4. for rolls 6-2,6-3,6-4, split to 18 point is superior. here are some results roll play pts/game ---------------------------------------------- 2-1 13/11, 24/23 -.005 24/21 -.008 13/10 -.029 24/22, 24/23 -.038 13/11, 6/6 -.045 ----------------------------------------------- 4-1 24/20 24/23 .006 13/9 24/23 -.017 13/8 -.034 24/20 6/5 -.043 13/9 6/5 -.064 ------------------------------------------------ 5-1 13/8 24/23 .001 24/18 -.016 13/8 6/5 -.064 ------------------------------------------------ 3-2 24/21 13/11 .017 13/10 24/22 .011 24/21 24/22 .001 13/10 13/11 -.009 13/8 -.034 8/5 13/11 -.062 ------------------------------------------------- 5-2 13/8 24/22 .004 13/8 13/11 .004 13/8 6/4 -.036 ------------------------------------------------ 4-3 24/20 24/21 .028 24/20 13/10 .014 13/9 24/21 .008 13/9 13/10 -.013 -------------------------------------------------- 5-4 13/8 24/20 .041 24/15 .014 13/8 13/9 .009 13/4 -.033 -------------------------------------------------- thats it for moves that aren't obvious Tom (chameleon)   Did you find the information in this article useful?           Do you have any comments you'd like to add?

 

Opening Rolls

At different match scores  (Louis Nardy Pillards, July 2002) 

Average advantage of winning opening roll  (Chuck Bower, Oct 1998) 

Choosing a strategy  (Daniel Murphy, June 2001) 

Early game rule of thumb  (Rich Munitz, Feb 2009) 

Factors to consider  (Kit Woolsey, July 1994) 

How computers play  (Kit Woolsey, Mar 1995) 

Magriel's Chapter 5  (Hayden Alfano+, May 2006) 

Mloner vs Jellyfish  (Kit Woolsey, Dec 1995) 

Nactating a whole game  (Nack Ballard+, Jan 2011) 

Nactation  (Jim Stutz+, June 2010) 

Nactation overview  (Nack Ballard, Oct 2009) 

Nactation--Why use it?  (leobueno+, Jan 2011) 

Opening 1's: Split or slot?  (Douglas Zare, Dec 2003) 

Opening 21: Rollout  (Stick, Mar 2006) 

Opening 21: Split or slot?  (Dick Adams+, Dec 2003) 

Opening 32: Rollout  (Stick, Feb 2006) 

Opening 43: In GOL online match  (Raccoon+, Feb 2004) 

Opening 43: Pros and cons  (Stick+, Jan 2006) 

Opening 43: Which split is better?  (Peter Backgren+, Aug 2000) 

Opening 43: Which split is better?  (Michael J. Zehr+, Mar 1996) 

Opening 51: Rollout  (Stick, Feb 2006) 

Opening 52: Merits of splitting  (Peter Bell, Apr 1995) 

Opening 53: Magriel's recommendation  (George Parker+, July 1997) 

Opening 53: Split to 21?  (Alex Zamanian, Aug 2000) 

Opening 53: Why make the three point?  (Kit Woolsey+, Feb 1996) 

Opening 6's: Slot the bar point?  (Chuck Bower+, Feb 2000) 

Opening 6's: Slot the bar point?  (David Montgomery, June 1995) 

Opening 62: Could running be best?  (Gary Wong, Sept 1997) 

Opening 62: Split, run, or slot?  (Chuck Bower, May 1997) 

Opening 63: Middle Eastern split?  (Mark+, Apr 2002) 

Opening 63: Slot the four point?  (Dennis Cartwright+, Mar 2002) 

Opening 64: Make the two point?  (William Hill+, Jan 1998) 

Opening 64: Make the two point?  (Darse Billings, Feb 1995) 

Opening 64: Rollout  (Peter Grotrian, Jan 2006) 

Opening 64: Split to 20?  (Peter Bell, June 1995) 

Opening 64: Three choices  (Brian Sheppard, July 1997) 

Opening 65: Becker on lover's leap  (Jeffrey Spiegler+, Aug 1991) 

Opening 65: Computer rankings  (Chuck Bower, Jan 1997) 

Opening rolls ranked  (Arthur+, Apr 2005) 

Rollouts of opening 21 and replies  (Alexander Nitschke, Oct 1997) 

Rollouts of openings  (Tom Keith+, Jan 2006) 

Rollouts: Expert Backgammon  (Tom Fahland, Aug 1994) 

Rollouts: Jellyfish 3.0  (Midas+, Sept 1997) 

Rollouts: Jellyfish 3.0 level 6  (Chuck Bower, Feb 1999) 

Rollouts: Snowie 4.1  (Rene Cerutti, Apr 2004) 

Slotting the four point  (Joe Loria+, Oct 1999) 

Snowie's openers and replies  (rcerutti, Feb 1999) 

Splitting versus building  (Dave Slayton+, Aug 2000) 

Splitting versus slotting  (Daniel Murphy, Apr 2001) 

Splitting versus slotting  (Daniel Murphy, Sept 1997) 

Trice's rankings  (Marty Storer, Feb 1992) 

From GammOnLine         Long message         Recommended reading         Recent addition

 

Book Suggestions Books Cheating Chouettes Computer Dice Cube Handling Cube Handling in Races Equipment Etiquette Extreme Gammon Fun and frustration GNU Backgammon History Jellyfish Learning Luck versus Skill Magazines & E-zines Match Archives Match Equities Match Play Match Play at 2-away/2-away Miscellaneous Opening Rolls Pip Counting Play Sites Probability and Statistics Programming Propositions Puzzles Ratings Rollouts Rules Rulings Snowie Software Source Code Strategy--Backgames Strategy--Bearing Off Strategy--Checker play Terminology Theory Tournaments Uncategorized Variations