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501 Essential Backgammon Problems #40 -- RO + Variant

Posted By: Igor
Date: Monday, 26 August 2013, at 1:43 p.m.

In Response To: 501 Essential Backgammon Problems #40 (Igor)

I have nothing to add to Mike's excellent analysis.





White is Player 2

score: 0
pip: 159
Unlimited Game
Jacoby
pip: 160
score: 0

Blue is Player 1
XGID=-----bE-D--AeC---c-e----B-:0:0:1:61:0:0:1:0:10
Blue to play 61

1.Rollout111/4eq: -0.284
Player:
Opponent:
43.60% (G:8.37% B:0.29%)
56.40% (G:14.25% B:0.47%)
Conf.: 0.003 (-0.287...-0.281) - [100.0%]
Duration: 2 hours 53 minutes
2.Rollout124/18 11/10eq: -0.293 (-0.008)
Player:
Opponent:
43.22% (G:8.72% B:0.32%)
56.78% (G:14.32% B:0.60%)
Conf.: 0.003 (-0.296...-0.289) - [0.0%]
Duration: 3 hours 08 minutes
3.Rollout213/7 8/7eq: -0.301 (-0.016)
Player:
Opponent:
43.05% (G:8.93% B:0.33%)
56.95% (G:14.27% B:0.58%)
Conf.: 0.005 (-0.306...-0.295) - [0.0%]
Duration: 1 hour 09 minutes
4.Rollout224/23 24/18eq: -0.304 (-0.019)
Player:
Opponent:
43.19% (G:7.65% B:0.29%)
56.81% (G:14.54% B:0.54%)
Conf.: 0.005 (-0.309...-0.299) - [0.0%]
Duration: 1 hour 12 minutes
5.Rollout324/18 8/7eq: -0.320 (-0.036)
Player:
Opponent:
43.10% (G:8.72% B:0.34%)
56.90% (G:16.64% B:0.85%)
Conf.: 0.008 (-0.328...-0.312) - [0.0%]
Duration: 36 minutes 47 seconds
1 25920 Games rolled with Variance Reduction.
Dice Seed: 18260878
Moves: 3-ply, cube decisions: XG Roller

2 10368 Games rolled with Variance Reduction.
Dice Seed: 18260878
Moves: 3-ply, cube decisions: XG Roller

3 5184 Games rolled with Variance Reduction.
Dice Seed: 18260878
Moves: 3-ply, cube decisions: XG Roller

eXtreme Gammon Version: 2.10

Here is a variant to show that (non-)stripping the midpoint is what makes the difference.





White is Player 2

score: 0
pip: 159
Unlimited Game
Jacoby
pip: 165
score: 0

Blue is Player 1
XGID=-----bE-C--AeD---c-e----B-:0:0:1:61:0:0:1:0:10
Blue to play 61

1.Rollout113/7 8/7eq: -0.317
Player:
Opponent:
42.87% (G:8.32% B:0.31%)
57.13% (G:14.85% B:0.59%)
Conf.: 0.003 (-0.321...-0.314) - [100.0%]
Duration: 3 hours 00 minute
2.Rollout111/4eq: -0.331 (-0.014)
Player:
Opponent:
42.51% (G:7.81% B:0.28%)
57.49% (G:14.78% B:0.50%)
Conf.: 0.003 (-0.334...-0.328) - [0.0%]
Duration: 2 hours 55 minutes
3.Rollout224/23 24/18eq: -0.337 (-0.019)
Player:
Opponent:
42.43% (G:7.17% B:0.28%)
57.57% (G:15.27% B:0.60%)
Conf.: 0.007 (-0.344...-0.329) - [0.0%]
Duration: 36 minutes 28 seconds
4.Rollout224/18 11/10eq: -0.338 (-0.021)
Player:
Opponent:
42.33% (G:8.40% B:0.33%)
57.67% (G:15.38% B:0.63%)
Conf.: 0.007 (-0.346...-0.331) - [0.0%]
Duration: 38 minutes 16 seconds
5.Rollout224/23 13/7eq: -0.364 (-0.046)
Player:
Opponent:
41.69% (G:9.14% B:0.34%)
58.31% (G:16.10% B:0.77%)
Conf.: 0.008 (-0.371...-0.356) - [0.0%]
Duration: 38 minutes 07 seconds
1 25920 Games rolled with Variance Reduction.
Dice Seed: 77695334
Moves: 3-ply, cube decisions: XG Roller

2 5184 Games rolled with Variance Reduction.
Dice Seed: 67453503
Moves: 3-ply, cube decisions: XG Roller

eXtreme Gammon Version: 2.10

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