[ View Thread ] [ Post Response ] [ Return to Index ] [ Read Prev Msg ] [ Read Next Msg ]

BGonline.org Forums

Rollout - do you trust it?

Posted By: Tenland
Date: Friday, 28 July 2017, at 8:28 p.m.

In Response To: Backgame ace to play (Tenland)





White is Player 2

score: 0
pip: 73
Unlimited Game
pip: 201
score: 0

Blue is Player 1
XGID=--AAAB-BA-------ab-cccCCcA:1:1:1:13:0:0:0:0:10
Blue to play 13

1.Rollout1Bar/22 3/2eq: -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 second
2.Rollout1Bar/22 4/3eq: -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 seconds
3.Rollout1Bar/22 7/6eq: -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 second
1 1296 Games rolled with Variance Reduction.
Moves and cube decisions: 4-ply

eXtreme 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: 66
Unlimited Game
pip: 197
score: 0

Blue is Player 1
XGID=--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: 66
Unlimited Game
pip: 197
score: 0

Blue is Player 1
XGID=--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: 63
Unlimited Game
pip: 197
score: 0

Blue is Player 1
XGID=--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: 63
Unlimited Game
pip: 197
score: 0

Blue is Player 1
XGID=--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?

Messages In This Thread

 

Post Response

Your Name:
Your E-Mail Address:
Subject:
Message:

If necessary, enter your password below:

Password:

 

 

[ View Thread ] [ Post Response ] [ Return to Index ] [ Read Prev Msg ] [ Read Next Msg ]

BGonline.org Forums is maintained by Stick with WebBBS 5.12.