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inconsistent rollouts

Posted By: David Rockwell
Date: Tuesday, 3 April 2012, at 4:13 p.m.

I accidentally performed a rollout twice with the same random seed. And, I got two different results. Does anyone have an idea why this may have happened?





White is Player 2

score: 0
pip: 167
4 point match
pip: 167
score: 1

Blue is Player 1
XGID=-b----E-C---eE---c-e----B-:0:0:1:43:1:0:0:4:10
Blue to play 43

1.Rollout113/10 13/9eq: -0.1349
Player:
Opponent:
49.64% (G:16.45% B:1.58%)
50.36% (G:13.99% B:1.66%)
Conf.: ±0.0048 (-0.1398...-0.1301) - [73.5%]
Duration: 1 day 23 hours 12 minutes
2.Rollout124/21 13/9eq: -0.1378 (-0.0029)
Player:
Opponent:
49.72% (G:15.21% B:1.51%)
50.28% (G:13.72% B:1.34%)
Conf.: ±0.0047 (-0.1426...-0.1331) - [17.2%]
Duration: 1 day 22 hours 57 minutes
3.Rollout124/20 13/10eq: -0.1388 (-0.0039)
Player:
Opponent:
49.73% (G:14.89% B:1.35%)
50.27% (G:13.50% B:1.32%)
Conf.: ±0.0047 (-0.1435...-0.1341) - [9.3%]
Duration: 2 days 00 hour 49 minutes
4.Rollout224/21 24/20eq: -0.1642 (-0.0293)
Player:
Opponent:
49.66% (G:13.21% B:1.36%)
50.34% (G:13.44% B:0.93%)
Conf.: ±0.0055 (-0.1697...-0.1588) - [0.0%]
Duration: 1 day 03 hours 20 minutes
1 31104 Games rolled with Variance Reduction.
Dice Seed: 25528416
Moves and cube decisions: 3-ply

2 15552 Games rolled with Variance Reduction.
Dice Seed: 25528416
Moves and cube decisions: 3-ply

eXtreme Gammon Version: 2.01, MET: Rockwell-Kazaross





White is Player 2

score: 0
pip: 167
4 point match
pip: 167
score: 1

Blue is Player 1
XGID=-b----E-C---eE---c-e----B-:0:0:1:43:1:0:0:4:10
Blue to play 43

1.Rollout113/10 13/9eq: -0.1474
Player:
Opponent:
49.56% (G:16.32% B:1.59%)
50.44% (G:13.90% B:1.49%)
Conf.: ±0.0041 (-0.1515...-0.1434) - [52.0%]
Duration: 1 day 07 hours 05 minutes
2.Rollout124/21 13/9eq: -0.1476 (-0.0002)
Player:
Opponent:
49.70% (G:14.95% B:1.49%)
50.30% (G:13.62% B:1.13%)
Conf.: ±0.0040 (-0.1516...-0.1436) - [47.1%]
Duration: 1 day 07 hours 38 minutes
3.Rollout124/20 13/10eq: -0.1525 (-0.0050)
Player:
Opponent:
49.65% (G:14.66% B:1.36%)
50.35% (G:13.46% B:1.09%)
Conf.: ±0.0039 (-0.1564...-0.1485) - [1.0%]
Duration: 1 day 09 hours 11 minutes
4.Rollout224/21 24/20eq: -0.1631 (-0.0157)
Player:
Opponent:
49.68% (G:13.15% B:1.33%)
50.32% (G:13.38% B:0.92%)
Conf.: ±0.0048 (-0.1679...-0.1583) - [0.0%]
Duration: 1 day 05 hours 01 minute
1 31104 Games rolled with Variance Reduction.
Dice Seed: 25528416
Moves and cube decisions: 3-ply

2 20736 Games rolled with Variance Reduction.
Dice Seed: 25528416
Moves and cube decisions: 3-ply

eXtreme Gammon Version: 2.01, MET: Rockwell-Kazaross

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