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Rollout - do you trust it?
Posted By: Tenland In Response To: Backgame ace to play (Tenland)
Date: Friday, 28 July 2017, at 8:28 p.m.
White is Player 2
score: 0
pip: 73Unlimited Game pip: 201
score: 0
Blue is Player 1XGID=--AAAB-BA-------ab-cccCCcA:1:1:1:13:0:0:0:0:10 Blue to play 13
1. Rollout1 Bar/22 3/2 eq: -0,334
Player:
Opponent:44,21% (G:3,04% B:0,12%)
55,79% (G:41,89% B:3,59%)Conf.: ± 0,011 (-0,345...-0,323) - [100,0%]
Duration: 49 minutes 00 second2. Rollout1 Bar/22 4/3 eq: -0,372 (-0,038)
Player:
Opponent:43,42% (G:2,64% B:0,12%)
56,58% (G:42,76% B:3,71%)Conf.: ± 0,012 (-0,384...-0,361) - [0,0%]
Duration: 47 minutes 49 seconds3. Rollout1 Bar/22 7/6 eq: -0,399 (-0,065)
Player:
Opponent:42,87% (G:2,14% B:0,09%)
57,13% (G:43,93% B:3,89%)Conf.: ± 0,011 (-0,410...-0,387) - [0,0%]
Duration: 43 minutes 01 second1 1296 Games rolled with Variance Reduction.
Moves and cube decisions: 4-plyeXtreme Gammon Version: 2.10
My thinking was basically that sure, I guess we hit if we can after making a point, but it didn't feel like a big enough gain to get to hit with that offense that we would concede our opportunity to prepare for a purer and better offense later.
Instead, my idea was to accept that we won't hit in a while, and build an offense that does some damage when we do.
In addition, there was the obvious aversion to making deep points when we know we have to contain him. And the 6-point really feels critical to make asap.
It probably is a big factor that it is so easy for us to flood the outfield after hitting, since in all likelihood he is down to a three prime when we do. The fact that our timing is too good seems to matter as well, perhaps because our backgame will still be well timed after hitting and failing to contain him?
Anyhow, this was very hard for me, as I am pretty sure I would have played 7/6. Luckily, the position came up OTB in a friend's match, not mine :)
Since we want to hit immediately after playing 3/2, I get that that play may be better than my play 7/6 in the following variation (43):
White is Player 2
score: 0
pip: 66Unlimited Game pip: 197
score: 0
Blue is Player 1XGID=--AAABAAA-------a--cddDCc-:1:1:1:00:0:0:0:0:10 Blue on roll, cube action?
Analyzed in XG Roller++ No redouble Redouble/Take Player Winning Chances: 38,78% (G:0,63% B:0,03%) 39,26% (G:0,63% B:0,04%) Opponent Winning Chances: 61,22% (G:47,19% B:4,78%) 60,74% (G:47,23% B:5,15%) Cubeless Equities -0,738 -1,464 Cubeful Equities No redouble: -0,587 Redouble/Take: -1,990 (-1,403) Redouble/Pass: +1,000 (+1,587) Best Cube action: No redouble / Take Percentage of wrong pass needed to make the double decision right: 31,9% eXtreme Gammon Version: 2.10
versus
White is Player 2
score: 0
pip: 66Unlimited Game pip: 197
score: 0
Blue is Player 1XGID=--B-AB-BA-------a--cddDCc-:1:1:1:00:0:0:0:0:10 Blue on roll, cube action?
Analyzed in XG Roller++ No redouble Redouble/Take Player Winning Chances: 39,87% (G:1,89% B:0,08%) 39,37% (G:1,89% B:0,08%) Opponent Winning Chances: 60,13% (G:44,95% B:4,79%) 60,63% (G:45,46% B:4,87%) Cubeless Equities -0,680 -1,392 Cubeful Equities No redouble: -0,520 Redouble/Take: -1,929 (-1,409) Redouble/Pass: +1,000 (+1,520) Best Cube action: No redouble / Take Percentage of wrong pass needed to make the double decision right: 32,5% eXtreme Gammon Version: 2.10
However, I was very surprised that it is only marginally worse in this (constructed) scenario:
White is Player 2
score: 0
pip: 63Unlimited Game pip: 197
score: 0
Blue is Player 1XGID=--AAABAAA----------dddDCc-:1:1:1:00:0:0:0:0:10 Blue on roll, cube action?
Analyzed in XG Roller++ No redouble Redouble/Take Player Winning Chances: 39,30% (G:0,04% B:0,00%) 38,99% (G:0,03% B:0,00%) Opponent Winning Chances: 60,70% (G:47,15% B:5,00%) 61,01% (G:47,36% B:5,53%) Cubeless Equities -0,735 -1,497 Cubeful Equities No redouble: -0,587 Redouble/Take: -2,018 (-1,430) Redouble/Pass: +1,000 (+1,587) Best Cube action: No redouble / Take Percentage of wrong pass needed to make the double decision right: 32,2% eXtreme Gammon Version: 2.10
versus
White is Player 2
score: 0
pip: 63Unlimited Game pip: 197
score: 0
Blue is Player 1XGID=--B-AB-BA----------dddDCc-:1:1:1:00:0:0:0:0:10 Blue on roll, cube action?
Analyzed in XG Roller++ No redouble Redouble/Take Player Winning Chances: 38,90% (G:0,03% B:0,00%) 38,74% (G:0,05% B:0,00%) Opponent Winning Chances: 61,10% (G:46,98% B:5,43%) 61,26% (G:47,30% B:5,37%) Cubeless Equities -0,746 -1,503 Cubeful Equities No redouble: -0,601 Redouble/Take: -1,998 (-1,397) Redouble/Pass: +1,000 (+1,601) Best Cube action: No redouble / Take Percentage of wrong pass needed to make the double decision right: 31,8% eXtreme Gammon Version: 2.10
Since the position isn't all that exotic I would tend to trust XG on this one. Do you?
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