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

BGonline.org Forums

Position of the Day 04-14-25 - Backgame Cube - Rollouts

Posted By: Stick
Date: Tuesday, 3 June 2025, at 7:34 p.m.

In Response To: Position of the Day 04-14-25 - Backgame Cube (Stick)

So first things first, the original position and Variant #1 where the defender's back spare is advanced to a presumed better spot makes virtually no difference. (See below)

Looking back I wish I had posted Variant #3 (or #2) as the Potd problem. Everyone in the comments knew to double with three points to clear and all took without much thought to where the opponent's checkers were. Maybe they didn't think it was worth mentioning since it wasn't an issue in the actual problem posted but it is definitely worth noting that re-aliving those checkers to spares instead of dead checkers makes quite the difference. (See below)





White is Player 1

score: 0
pip: 164
Unlimited Game
Jacoby Beaver
pip: 72
score: 0

Blue is Player 2
XGID=---BBBBA--A-------bedBbCb-:0:0:-1:00:0:0:3:0:10
Blue on roll, cube action?

Analyzed in Rollout No double Double/Take
Player Winning Chances: 61.14% (G:39.41% B:1.54%) 61.28% (G:39.75% B:1.47%)
Opponent Winning Chances: 38.86% (G:3.59% B:0.12%) 38.72% (G:3.56% B:0.13%)
Cubeless Equities +0.595 +1.202
Cubeful Equities
No double:+0.703 (-0.156)±0.014 (+0.689..+0.716)
Double/Take:+0.859±0.019 (+0.840..+0.877)
Double/Pass:+1.000 (+0.141)
Best Cube action: Double / Take
Rollout details
1296 Games rolled with Variance Reduction.
Moves: 3-ply, cube decisions: XG Roller
Double Decision confidence:100.0%
Take Decision confidence:100.0%
Duration: 39.4 seconds


Variant #1





White is Player 1

score: 0
pip: 162
Unlimited Game
Jacoby Beaver
pip: 72
score: 0

Blue is Player 2
XGID=---BBBBA--A-------bedCbBb-:0:0:-1:00:0:0:3:0:10
Blue on roll, cube action?

Analyzed in Rollout No double Double/Take
Player Winning Chances: 61.08% (G:38.43% B:1.44%) 61.20% (G:38.72% B:1.44%)
Opponent Winning Chances: 38.92% (G:3.37% B:0.10%) 38.80% (G:3.40% B:0.11%)
Cubeless Equities +0.586 +1.181
Cubeful Equities
No double:+0.701 (-0.148)±0.011 (+0.690..+0.712)
Double/Take:+0.849±0.017 (+0.832..+0.865)
Double/Pass:+1.000 (+0.151)
Best Cube action: Double / Take
Rollout details
1296 Games rolled with Variance Reduction.
Moves: 3-ply, cube decisions: XG Roller
Double Decision confidence:100.0%
Take Decision confidence:100.0%
Duration: 39.5 seconds


Variant #2





White is Player 1

score: 0
pip: 162
Unlimited Game
Jacoby Beaver
pip: 78
score: 0

Blue is Player 2
XGID=---BBBBA--A-------beeCcB--:0:0:-1:00:0:0:3:0:10
Blue on roll, cube action?

Analyzed in Rollout No double Double/Take
Player Winning Chances: 64.96% (G:38.17% B:1.96%) 65.13% (G:38.32% B:1.80%)
Opponent Winning Chances: 35.04% (G:2.80% B:0.11%) 34.87% (G:2.76% B:0.11%)
Cubeless Equities +0.671 +1.350
Cubeful Equities
No double:+0.782 (-0.218)±0.010 (+0.772..+0.792)
Double/Take:+1.039 (+0.039)±0.020 (+1.019..+1.058)
Double/Pass:+1.000
Best Cube action: Double / Pass
Rollout details
1296 Games rolled with Variance Reduction.
Moves: 3-ply, cube decisions: XG Roller
Double Decision confidence:100.0%
Take Decision confidence:100.0%
Duration: 35.6 seconds


Variant #3





White is Player 1

score: 0
pip: 164
Unlimited Game
Jacoby Beaver
pip: 78
score: 0

Blue is Player 2
XGID=---BBBBA--A-------beeBcC--:0:0:-1:00:0:0:3:0:10
Blue on roll, cube action?

Analyzed in Rollout No double Double/Take
  Player Winning Chances: 64.86% (G:39.15% B:2.05%) 65.14% (G:39.86% B:2.14%)
  Opponent Winning Chances: 35.14% (G:2.99% B:0.10%) 34.86% (G:2.92% B:0.10%)
  Cubeless Equities +0.678 +1.386
Cubeful Equities
No double:+0.796 (-0.204)±0.010 (+0.786..+0.806)
Double/Take:+1.078 (+0.078)±0.019 (+1.059..+1.097)
Double/Pass:+1.000
 
Best Cube action: Double / Pass
Rollout details
1296 Games rolled with Variance Reduction.
Moves: 3-ply, cube decisions: XG Roller
 
Double Decision confidence:100.0%
Take Decision confidence:100.0%
Duration: 35.6 seconds

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.