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 Bagai: Classic Backgammon Revisited #100

 From: Raccoon Address: racgammon@yahoo.com Date: 17 November 2004 Subject: Robertie 188 (Bagai 100) Forum: GammOnLine

```This position is 188 in Advanced Backgammon, 100 in Classic Backgammon
Revisited.

Money Game. X to play 43

24  23  22  21  20  19      18  17  16  15  14  13
+---+---+---+---+---+---+---+---+---+---+---+---+---+
| X   O   X   O       O |   | O                     |
| X   O   X   O       O |   | O                     |
|     O       O         |   |                       |
|     O                 |   |                       |
|     O                 |   |                       |
|     O                 |   |                       |
|     O                 |   |                       |
|     O                 |   |                       |
|                       |   |                       |
|                       |   |                       |
|         X             |   |                       |
|     X   X   X   X   X |   |                       |   +---+
|     X   X   X   X   X |   |                       |   | 2 |
+---+---+---+---+---+---+---+---+---+---+---+---+---+   +---+
1   2   3   4   5   6       7   8   9  10  11  12

Pip counts: O=54, X=135    Position ID: /jkbAAB22wAAMw

In Advanced Backgammon, Robertie compares 24/17 to 6/4 6/3. He says
X's winning chances are about 60% after either play, but that X
loses fewer gammons with 6/4 6/3. "By keeping both rear points and
maximizing his hits," he writes, "[X] reduces his chances of being
gammoned to about 15%.... Keeping both points and minimizing the chance
of being blitzed is the best play by about a quarter of a point."

Enter Bagai armed with Snowie 3 rollouts (cubeless, full trials, search
space medium, speed 25%).

He finds a third play, 5/1 5/2, that performed better in the Snowie
rollouts than 6/2 6/3, but concludes that "the best play seems to be
24/17. Snowie agrees that breaking the rear anchor gets Black gammoned
about 5% more often than either of the board-breaking plays, but, in
contrast to Robertie, finds that maintaining the board wins more than
enough extra games to compensate."

Bagai summarizes the Snowie rollout thus:

Play      Equity
24/17     -0.055
5/1 5/2   -0.062
6/2 6/3   -0.128

Enter GNU Backgammon, 2-ply (world class 0-ply filter), cubeful, neural
net pruning):

Move                                         Equity
5/2 5/1   .458 .056 .001 - .541 .185 .010    +0.015
24/17     .463 .098 .003 - .537 .239 .001    -0.080 (-.095)
6/3 6/2   .427 .047 .001 - .572 .190 .010    -0.091 (-.106)

The Gnu BG rollout puts the odd man out 5/1 5/2 on top with positive
cubeful equity, and either of the other two plays are cubeful whoppers.
```

### Books

Bagai: Classic Backgammon Revisited  (Gregg Cattanach, Feb 2002)
Bagai: Classic Backgammon Revisited #100  (Raccoon, Nov 2004)
Bagai: Classic Backgammon Revisited--Errata  (Jeremy Bagai+, Apr 2005)
Ball: Alpha Backgammon  (James Takahashi+, May 1994)
Ballard & Weaver: Backgammon Openings Book A  (Marty Storer, Jan 2008)
Ballard & Weaver: Backgammon Openings Book A  (Mislav Radica, Nov 2007)
Ballard & Weaver: Backgammon Openings Book A  (Rob Adams+, Oct 2007)
Ballard & Weaver: Backgammon Openings Book A  (Gregg Cattanach, Oct 2007)
Ballard & Weaver: Backgammon Openings Book A  (Neil Kazaross+, Jan 2005)
Ballard & Weaver: Backgammon Openings--Volunteers needed  (Nack Ballard, June 2007)
Barr: Barr on Backgammon  (Walter Swan+, Feb 1996)
Becker: Backgammon for Blood  (Gus, Mar 2003)
Becker: Backgammon for Blood  (PTaber+, June 1999)
Becker: Backgammon for Blood  (Michael Fuhrmann, Aug 1997)
Becker: Backgammon for Blood  (Daniel Murphy, July 1997)
Becker: Backgammon for Blood  (Durf Freund+, May 1994)
Bell: Winning with the Doubling Cube  (&Atilda;˜ystein Johansen+, Apr 2006)
Bell: Winning with the Doubling Cube  (André Nicoulin, Oct 2000)
Bell: Winning with the Doubling Cube  (David Montgomery, May 1999)
Bell: Winning with the Doubling Cube  (Peter Bell, Aug 1998)
Bell: Winning with the Doubling Cube  (Jacques Torrione, Feb 1998)
Bell: Winning with the Doubling Cube  (Robert Scibelli, Dec 1997)
Bell: Winning with the Doubling Cube  (Kevin Bastian, Nov 1997)
Bray: Backgammon for Blood  (Chris Bray, Sept 2007)
Bray: Backgammon to Win  (Chris Bray, June 2007)
Bray: Backgammon to Win, second edition  (Chris Bray, Aug 2012)
Bray: Backgammon--An Independent View  (Chris Bray, May 1998)
Bray: Backgammon--An Independent View Revisited  (Chris Bray+, Jan 2005)
Bray: Second Wind  (Chris Bray, May 2007)
Bray: What Colour is the Wind?  (Chris Bray+, June 2002)
Bray: What Colour is the Wind?--Rerelease  (Chris Bray, Sept 2006)
Brooks: Backgammon's Best Openings and Replies  (Chuck Bower+, Dec 2004)
Clay: Backgammon Winning Strategies  (Michael Strato, Nov 1999)
Clay: Backgammon Winning Strategies  (Gary Wong, Jan 1998)
Cooke & Bradshaw: Backgammon--The Cruelest Game  (Chuck Bower+, Aug 1998)
Cooke & Orléan: Championship Backgammon  (Timothy Chow+, Apr 2011)
Cooke & Orléan: Championship Backgammon  (Marty Storer, Sept 2004)
Cooke: Paradoxes and Probabilities  (Neil Kazaross+, Sept 2004)
Cooke: Paradoxes and Probabilities  (Peter van Arkel+, Sept 2002)
Cooke: Paradoxes and Probabilities  (Donald Kahn, Dec 1998)
Cooke: Paradoxes and Probabilities  (Stephen Turner, Apr 1996)
Corbett: Backgammon Problems  (Stick+, Jan 2008)
Deyong: The Playboy Book of Backgammon  (Shuman Lloyd Lee, Aug 1991)
Dwek: Backgammon for Profit  (Bob Stringer, Sept 2002)
Euler: Everyday Errors in Checker Play  (BaronGossettEulerPhD+, June 2012)
Garal: Fair Backgammon Tournament Rules  (Jakob Garal, June 2007)
Heinrich & Woolsey: New Ideas in Backgammon  (Douglas Zare, Mar 2003)
Heinrich & Woolsey: New Ideas in Backgammon  (Craig E. Groeschel+, Sept 1998)
Heinrich & Woolsey: New Ideas in Backgammon  (David Montgomery, May 1997)
Heyken & Fischer: The Backgammon Handbook  (Martin Fischer, Sept 1998)
Heyken & Fischer: The Backgammon Handbook  (Marina Smith, Feb 1998)
Hickey & Storer: What's Your Game Plan?  (Timothy Chow, May 2011)
Jacoby & Crawford: The Backgammon Book  (Patrick Wilken, Aug 1991)
Kansil: The Backgammon Quiz Book  (Daniel Murphy, July 1997)
Kansil: The Backgammon Quiz Book--Five problems  (Chuck Bower, Oct 1997)
Kennedy & Papazian: Backgammon Master Games  (Ben Fairbank+, Apr 1999)
Kershaw: Backgammon Funfair  (Tom Keith+, July 2012)
Kershaw: Backgammon Funfair  (Peter Bennet, May 2012)
Lamford: 100 Backgammon Puzzles  (Harold Simon+, Oct 2001)
Lamford: 100 Backgammon Puzzles  (Mark Driver, July 2001)
Lamford: 100 Backgammon Puzzles--Snowie analysis  (Michael Schell, Oct 2001)
Lamford: Improve Your Backgammon  (Alef Rosenbaum, May 2003)
Leet: Winning Backgammon  (Ryan Long, Apr 2002)
Leet: Winning Backgammon  (MW Book Review, July 1999)
Lortz: Double ... now: An Authentic Cube Remedy  (Chuck Bower+, Jan 2004)
Mabardi & Luce: Vanity Fair's Backgammon to Win  (Paul Tanenbaum, Feb 1998)
Magriel: Backgammon  (Baldo+, Mar 2004)
Magriel: Backgammon  (Neil Kazaross, July 2003)
Magriel: Backgammon  (Chuck Bower, Nov 1999)
Magriel: Backgammon  (Dean Gay, Sept 1999)
Magriel: Backgammon  (David Montgomery+, Aug 1997)
Magriel: Backgammon--2004 Edition  (Tom Keith+, Dec 2004)
Magriel: Backgammon--GnuBG evaluations  (Randy, July 2008)
Martyn: Phillip Martyn on Backgammon  (Steve Brorens+, Nov 1996)
Munchkin: Gambling Wizards  (Chuck Bower, Aug 2003)
Obolensky & James: Backgammon the Action Game  (Edward D. Collins+, Oct 1999)
Reese & Brinig: Backgammon: The Modern Game  (Al Mirpuri+, Sept 2011)
Robertie: 501 Essential Backgammon Problems  (Paul Epstein, July 2005)
Robertie: 501 Essential Backgammon Problems  (Albert Silver, Nov 2002)
Robertie: 501 Essential Backgammon Problems  (Tore Fredriksen, July 2002)
Robertie: 501 Essential Backgammon Problems  (Erik M Sørensen, May 2000)
Robertie: 501 Essential Backgammon Problems  (Daniel Hollis, May 2000)
Robertie: 501 Essential Backgammon Problems #75  (Hardy Hübener+, Nov 2005)
Robertie: Advanced Backgammon  (Doni+, Jan 2005)
Robertie: Advanced Backgammon  (Scott Steiner+, Sept 2002)
Robertie: Advanced Backgammon  (James Eibisch, Jan 1998)
Robertie: Advanced Backgammon #165  (Peter Grotrian+, Mar 2005)
Robertie: Advanced Backgammon--Errata  (Matt Senecal+, Nov 2004)
Robertie: Advanced Backgammon--JF rollouts  (Øystein Johansen, June 2001)
Robertie: Advanced Backgammon--JF rollouts  (Alexander Nitschke, Feb 1997)
Robertie: Advanced Backgammon--JF rollouts  (Peter Fankhauser, Jan 1996)
Robertie: Backgammon for Winners  (Carl Tait, Aug 1998)
Robertie: Backgammon for Winners  (Gerry Tesauro, Oct 1993)
Robertie: Modern Backgammon  (Mattias+, Apr 2003)
Robertie: Modern Backgammon  (Gregg Cattanach, Oct 2002)
Robertie: Modern Backgammon  (Frank Mazza+, May 2002)
Robertie: Reno 1986  (AH+, Aug 2007)
Shiina: Cube Action 1000  (Mochy, Feb 2013)
Steed: Backgammon: The Meanest Game  (Albert Steg, Aug 1998)
Stern: Backgammon: The Quick Course to Winning Play  (Mark Driver, May 2001)
Storer: Backgammon Praxis  (Chase+, Apr 2007)
Storer: Backgammon Praxis  (Marty Storer+, May 2004)
Thorne's Backgammon Tactics (Reprint)  (Sam Sloan, July 2012)
Tremaine: Amazing Book of Backgammon  (Jim Wallace, Feb 1998)
Trice: Backgammon Boot Camp--2nd edition  (Jeremy Bagai+, June 2007)
Tzannes brothers: Backgammon Games and Strategies  (Mark Driver, Apr 2001)
Tzannes brothers: Backgammon Games and Strategies  (Albert Steg, May 1994)
Tzannes brothers: How Good Are You at Backgammon?  (Mark Driver, July 2001)
Wiggins: Boards, Blots, and Double Shots  (Ned Cross+, Mar 2004)
Williams: Backgammon Live in London  (Sean Williams+, June 2008)
Woolsey & Beadles: 52 Great Backgammon Tips  (Paul Epstein+, Dec 2007)
Woolsey & Jones: Understanding Backgammon  (Jon Nall+, Feb 2004)
Woolsey: How to Play Tournament Backgammon  (John Bazigos, Oct 1994)
Woolsey: The Backgammon Encyclopedia Vol 1  (Dean Gay+, Feb 2004)