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501 Essential Backgammon Problems #283 -- Rollout + Variants

Posted By: Igor
Date: Friday, 13 December 2013, at 5:45 p.m.

In Response To: 501 Essential Backgammon Problems #283 (Igor)

Robertie identifies race as a major factor in this position. He suggests hitting since we are not too far ahead in the race after the roll. But we do have a small race lead, so let's take a permanent asset instead. We are just not under big pressure to hit right now, especially given our blot on the ace point.





White is Player 2

score: 0
pip: 162
Unlimited Game
Jacoby
pip: 158
score: 0

Blue is Player 1
XGID=aA-B-bB-D---bCa--d-cb-AB--:0:0:1:45:0:0:1:0:10
Blue to play 45

1.Rollout123/18 22/18eq: -0.241
Player:
Opponent:
45.10% (G:9.07% B:0.32%)
54.90% (G:17.45% B:0.57%)
Conf.: ± 0.011 (-0.252...-0.230) - [100.0%]
Duration: 18 minutes 08 seconds
2.Rollout123/14* eq: -0.298 (-0.057)
Player:
Opponent:
43.54% (G:11.77% B:0.40%)
56.46% (G:18.03% B:0.88%)
Conf.: ± 0.012 (-0.311...-0.286) - [0.0%]
Duration: 19 minutes 09 seconds
1 2592 Games rolled with Variance Reduction.
Dice Seed: 32271713
Moves: 3-ply, cube decisions: XG Roller

eXtreme Gammon Version: 2.10

Make the race closer and hitting is almost as good as making the bar point:





White is Player 2

score: 0
pip: 162
Unlimited Game
Jacoby
pip: 163
score: 0

Blue is Player 1
XGID=aA-B-bB-C---bDa--d-cb-AB--:0:0:1:45:0:0:1:0:10
Blue to play 45

1.Rollout123/18 22/18eq: -0.313
Player:
Opponent:
43.50% (G:8.61% B:0.28%)
56.50% (G:18.22% B:0.65%)
Conf.: ± 0.003 (-0.316...-0.311) - [97.5%]
Duration: 5 hours 31 minutes
2.Rollout123/14* eq: -0.317 (-0.004)
Player:
Opponent:
43.22% (G:10.71% B:0.36%)
56.78% (G:18.27% B:0.89%)
Conf.: ± 0.003 (-0.320...-0.314) - [2.5%]
Duration: 5 hours 56 minutes
1 46656 Games rolled with Variance Reduction.
Dice Seed: 32271713
Moves: 3-ply, cube decisions: XG Roller

eXtreme Gammon Version: 2.10

Go back to the original position and provide a direct cover for our ace point blot; hitting becomes a contender now.





White is Player 2

score: 0
pip: 162
Unlimited Game
Jacoby
pip: 156
score: 0

Blue is Player 1
XGID=aA-B-bC-C---bCa--d-cb-AB--:0:0:1:45:0:0:1:0:10
Blue to play 45

1.Rollout123/18 22/18eq: -0.188
Player:
Opponent:
46.36% (G:9.72% B:0.29%)
53.64% (G:16.34% B:0.57%)
Conf.: ± 0.004 (-0.191...-0.184) - [99.9%]
Duration: 2 hours 22 minutes
2.Rollout123/14* eq: -0.197 (-0.009)
Player:
Opponent:
45.47% (G:13.01% B:0.40%)
54.53% (G:16.47% B:0.78%)
Conf.: ± 0.004 (-0.201...-0.192) - [0.1%]
Duration: 2 hours 24 minutes
1 20736 Games rolled with Variance Reduction.
Dice Seed: 94004437
Moves: 3-ply, cube decisions: XG Roller

eXtreme Gammon Version: 2.10

Fuse the two variants together: closer race and direct cover for the ace point blot, and hitting finally becomes the right play.





White is Player 2

score: 0
pip: 162
Unlimited Game
Jacoby
pip: 161
score: 0

Blue is Player 1
XGID=aA-B-bC-B---bDa--d-cb-AB--:0:0:1:45:0:0:1:0:10
Blue to play 45

1.Rollout123/14* eq: -0.246
Player:
Opponent:
44.39% (G:12.03% B:0.38%)
55.61% (G:17.19% B:0.82%)
Conf.: ± 0.012 (-0.258...-0.234) - [100.0%]
Duration: 19 minutes 16 seconds
2.Rollout123/18 22/18eq: -0.279 (-0.033)
Player:
Opponent:
44.25% (G:9.16% B:0.28%)
55.75% (G:18.12% B:0.66%)
Conf.: ± 0.011 (-0.290...-0.268) - [0.0%]
Duration: 18 minutes 09 seconds
1 2592 Games rolled with Variance Reduction.
Dice Seed: 70516885
Moves: 3-ply, cube decisions: XG Roller

eXtreme Gammon Version: 2.10

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