Backgammon Cubes of the Giants

by Steve Sax
2 November 2012


Steve Sax

To sharpen my game in between tournaments I like to play practice matches on the internet at GridGammon against some of the top players in the world. Included among those players are ten of the top 64 players on the "Giants of Backgammon" list. Five of those are in the top 32, and the other five may eventually arrive there but are currently in the second 32.

Like David Letterman we'll go over the ten players (and positions) I played in reverse order from 10 to 1 in descending order of their ranking on the "Giants" list. All of these positions are cube actions where either I or the "Giant" in question had a very difficult or interesting decision to make.

Coming in at number ten is "Giant #61", Justin Nunez. Justin has made great strides in the short time he has been in the backgammon scene. Apart from his success in tournament play he is also an integral part of the USBGF's effort to promote backgammon across the USA. He has not only run tournaments on the internet, but has coached players from the UCLA's 2011 National Collegiate Backgammon Championship team.

Leading 3-2 to 7, I doubled Justin in position "Giant Cube 10" where I had an advanced anchor and led by 20 pips in the race. I also had him out boarded two to one and had three builders to make my bar, five or three points. And if that weren't enough, Justin had to take at a disadvantageous score as a gammon would win me the match.

Position Giant Cube 10:

is Player 2

score: 3
pip: 162
7 point match
pip: 142
score: 2

is Player 1
XGID=-b--B-E-BA--dC---d-eB-----:0:0:1:00:2:3:0:7:10
on roll, cube action?


Analyzed in Rollout
No Double
  Player Winning Chances: 69.24% (G: 19.57% B: 1.08%)
  Opponent Winning Chances: 30.76% (G: 4.99% B: 0.25%)
Double/Take
  Player Winning Chances: 69.50% (G: 19.48% B: 1.08%)
  Opponent Winning Chances: 30.50% (G: 5.46% B: 0.40%)
 
Cubeless Equities
No Double:+0.520
Double:+1.143
 
Cubeful Equities
No Double:+0.863 (-0.058)
Double/Take:+0.921
Double/Drop:+1.000 (+0.079)
 
Best Cube action: Double / Take
 
Rollout details
1296 Games rolled with Variance Reduction.
Moves: 3 ply, cube decisions: XG Roller
 
Confidence No Double: ± 0.013 (+0.850...+0.876)
Confidence Double: ± 0.019 (+0.901...+0.940)
 
Double Decision confidence: 100.0%
Take Decision confidence: 100.0%
 
Duration: 9 minutes 17 seconds

eXtreme Gammon Version: 1.21, MET: Rockwell-Kazaross


 
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