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Relevant Second Roll Positions

Posted By: Paul Weaver
Date: Wednesday, 22 January 2014, at 4:26 p.m.

In Response To: Advanced Backgammon #7 (Igor)

If you are familiar with 51$-32 and 51$-52, then it will help you figure out the best play in 32D-51$-21D. The XG book rollout results (thanks to Neil Kazaross and GameSite 2000) of 51$-32 and 51$-52 are posted below. Few folks slot with opening 51, so we do not see these two positions often.





White is Player 2

score: 0
pip: 161
Unlimited Game
Jacoby Beaver
pip: 167
score: 0

Blue is Player 1
XGID=-b----E-C---dE---d-da---B-:0:0:1:23:0:0:3:0:10
Blue to play 23

1.Book113/10 6/4eq: -0.218
Player:
Opponent:
45.26% (G:12.71% B:0.68%)
54.74% (G:17.47% B:1.34%)
Conf.: 0.003 (-0.221...-0.215) - [61.8%]
2.Book124/21 13/11eq: -0.219 (-0.001)
Player:
Opponent:
45.18% (G:11.49% B:0.61%)
54.82% (G:16.43% B:0.92%)
Conf.: 0.003 (-0.221...-0.216) - [38.2%]
3.Book224/22 13/10eq: -0.225 (-0.007)
Player:
Opponent:
44.83% (G:11.93% B:0.63%)
55.17% (G:16.43% B:0.91%)
Conf.: 0.004 (-0.229...-0.222) - [0.0%]
4.Book313/11 13/10eq: -0.242 (-0.024)
Player:
Opponent:
44.50% (G:12.78% B:0.68%)
55.50% (G:17.23% B:1.24%)
Conf.: 0.012 (-0.254...-0.230) - [0.0%]
1 Generated by Neil Kazaross on 4/22/2010 using eXtreme Gammon 1.13
46656 Games rolled with Variance Reduction.
Dice Seed: Random
Moves and cube decisions: 4-ply

2 Generated by Neil Kazaross on 4/22/2010 using eXtreme Gammon 1.13
31104 Games rolled with Variance Reduction.
Dice Seed: Random
Moves and cube decisions: 4-ply

3 Generated by Neil Kazaross on 4/22/2010 using eXtreme Gammon 1.13
5184 Games rolled with Variance Reduction.
Dice Seed: Random
Moves and cube decisions: 3-ply

eXtreme Gammon Version: 2.10





White is Player 2

score: 0
pip: 161
Unlimited Game
Jacoby Beaver
pip: 167
score: 0

Blue is Player 1
XGID=-b----E-C---dE---d-da---B-:0:0:1:25:0:0:3:0:10
Blue to play 25

1.Book113/8 6/4eq: -0.231
Player:
Opponent:
44.83% (G:12.48% B:0.56%)
55.17% (G:17.06% B:0.94%)
Conf.: 0.007 (-0.238...-0.224) - [78.0%]
2.Book124/22 13/8eq: -0.235 (-0.004)
Player:
Opponent:
44.82% (G:11.71% B:0.51%)
55.18% (G:16.82% B:0.67%)
Conf.: 0.007 (-0.242...-0.228) - [22.0%]
3.Book113/11 13/8eq: -0.257 (-0.026)
Player:
Opponent:
44.23% (G:12.75% B:0.64%)
55.77% (G:17.68% B:0.99%)
Conf.: 0.007 (-0.264...-0.250) - [0.0%]
1 Generated by GameSite 2000, Ltd on 2/26/2011 using eXtreme Gammon 2.00
10368 Games rolled with Variance Reduction.
Dice Seed: 77390818
Moves: 2-ply, cube decisions: 3-ply Red

eXtreme Gammon Version: 2.10

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