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Rollout: Snake eyes against a shaky backgame

Posted By: Timothy Chow
Date: Monday, 24 September 2012, at 2:23 p.m.

In Response To: Snake eyes against a shaky backgame (Timothy Chow)

The bot was playing blue and I was surprised by its play, since I was expecting it to shift points from the 10pt to the 9pt, in order to make it easier to clear that point. Indeed, the bot later had difficulty clearing the 10pt.

ah_clem's point about killing 6's is one that I did not think about when looking at the position. I'm still not sure if it's the key reason to hold the 10pt. Killing 6's slow Blue's bearin, but does Blue really want to slow down his bearin?





White is Player 1

score: 0
pip: 134
Money session
Jacoby
pip: 92
score: 0

Blue is Player 2
XGID=-b-CbCDB--C--------bbcbb--:1:-1:1:11:0:0:1:0:10
Blue to play 11

1.Rollout110/7 6/5eq: +0.599
Player:
Opponent:		 75.54% (G:19.45% B:1.26%)
24.46% (G:2.26% B:0.07%)		Conf: ± 0.007 (+0.592...+0.606)
Duration: 4 hours 41 minutes
2.Rollout110/9(3) 6/5eq: +0.535 (-0.064)
Player:
Opponent:		 73.57% (G:17.94% B:1.20%)
26.43% (G:2.98% B:0.09%)		Conf: ± 0.007 (+0.528...+0.542)
Duration: 4 hours 41 minutes
3.Rollout110/6eq: +0.525 (-0.074)
Player:
Opponent:		 72.80% (G:18.92% B:1.37%)
27.20% (G:2.72% B:0.09%)		Conf: ± 0.007 (+0.518...+0.532)
Duration: 4 hours 04 minutes
1 2592 Games rolled with Variance Reduction.
Dice Seed: 2
First 4 moves and cube decisions: 4 ply
Remaining moves and cube decisions: 3 ply

eXtreme Gammon Version: 1.21

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