Opening Rolls

Forum Archive : Opening Rolls

Opening 64: Rollout From:   Peter Grotrian Address:   peter@pgrz.de Date:   12 January 2006 Subject:   opening 64 rollout - showdown at 16428 Forum:   GammOnLine In this GNU BG 2-ply cubeful rollout, it's too close to call as to which play is best. Making the two-point is a clear cubeless winner. I notice winning the opening with 6-4 leaves you only as a very small favorite. Rank Ply Move Equity ==== === ========== ======== #1 R 8/2 6/2 +0.01021 P(W) P(WG) P(WBG) P(L) P(LG) P(LBG) cubeless cubeful ------ ------ ------- ------ ------ ------- -------- -------- .49842 .15768 .00811 - .50158 .14196 .00621 +0.01446 +0.01021 Equity .00044 .00050 .00015 - .00044 .00049 .00013 .00116 .00313 StdErr Rank Ply Move Equity ==== === ========== ======== #2 R 24/18 13/9 +0.00995 (-0.00026) P(W) P(WG) P(WBG) P(L) P(LG) P(LBG) cubeless cubeful ------ ------ ------- ------ ------ ------- -------- -------- .50289 .13598 .00665 - .49711 .13628 .00598 +0.00614 +0.00995 Equity .00050 .00052 .00020 - .00050 .00052 .0,015 0.00137 0.00341 StdErr Rank Ply Move Equity ==== === ========== ======== #3 R 24/14 +0.00857 (-0.00164) P(W) P(WG) P(WBG) P(L) P(LG) P(LBG) cubeless cubeful ------ ------ ------- ------ ------ ------- -------- -------- .50591 .11814 .00503 - .49409 .12888 .00479 +0.00132 +0.00857 Equity .00045 .00047 .00013 - .00045 .00050 .00012 0.00114 0.00308 StdErr Full cubeful rollout with var.redn. 16428 games, Mersenne Twister dice gen. with seed 983052480 and quasi-random dice. Play: world class 2-ply cubeful prune [world class] keep the first 0 0-ply moves and up to 8 more moves within equity 0,16. Skip pruning for 1-ply moves. Cube: 2-ply cubeful prune [world class].   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) 

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) 

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 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 Variations

Return to:  Backgammon Galore : Forum Archive Main Page