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Rollout of several similar positions and my 2 ct

Posted By: Klaus Evers
Date: Thursday, 27 May 2010, at 7:51 a.m.

In Response To: Recent cube action (rory)

Well. I know that the rollouts are not what WC players would consider strong settings, but they are good enough to get an impression of how helpful the front position of the underdog is.






is Player 2

score: 2
pip: 143
9 point match
pip: 139
score: 1

is Player 1
XGID=-a-BaBDBB--ab----c-cbAbA-A:0:0:-1:00:1:2:0:9:10
on roll, cube action?


Analyzed in Rollout
No Double
Player Winning Chances: 64,02% (G: 22,43% B: 1,69%)
Opponent Winning Chances: 35,98% (G: 10,62% B: 0,85%)
Double/Take
Player Winning Chances: 64,09% (G: 21,89% B: 2,14%)
Opponent Winning Chances: 35,91% (G: 10,48% B: 1,06%)
Cubeless Equities
No Double:+0,415
Double:+0,830
Cubeful Equities
No Double:+0,535
Double/Take:+0,463 (-0,073)
Double/Drop:+1,000 (+0,465)
Best Cube action: No Double / Take
Rollout details
1296 Games rolled with Variance Reduction.
Moves and cube decisions: 2 ply
Search interval: Large
Confidence No Double: ± 0,027 (+0,508...+0,562)
Confidence Double: ± 0,039 (+0,424...+0,502)
Double Decision confidence: 99,9%
Take Decision confidence: 100,0%
Duration: 2 minutes 22 seconds

eXtreme Gammon Version: 1.14, MET: GnuBG 11 point






is Player 2

score: 2
pip: 143
9 point match
pip: 158
score: 1

is Player 1
XGID=-a-BaBC-B--abC---c-cbAbA-A:0:0:-1:00:1:2:0:9:10
on roll, cube action?


Analyzed in Rollout
No Double
Player Winning Chances: 63,97% (G: 27,72% B: 2,20%)
Opponent Winning Chances: 36,03% (G: 9,48% B: 0,68%)
Double/Take
Player Winning Chances: 64,08% (G: 27,89% B: 2,53%)
Opponent Winning Chances: 35,92% (G: 9,60% B: 1,27%)
Cubeless Equities
No Double:+0,490
Double:+0,985
Cubeful Equities
No Double:+0,603 (-0,016)
Double/Take:+0,620
Double/Drop:+1,000 (+0,380)
Best Cube action: Double / Take
Rollout details
1296 Games rolled with Variance Reduction.
Moves and cube decisions: 2 ply
Search interval: Large
Confidence No Double: ± 0,026 (+0,578...+0,629)
Confidence Double: ± 0,039 (+0,581...+0,659)
Double Decision confidence: 75,4%
Take Decision confidence: 100,0%
Duration: 3 minutes 04 seconds

eXtreme Gammon Version: 1.14, MET: GnuBG 11 point






is Player 2

score: 2
pip: 143
9 point match
pip: 166
score: 1

is Player 1
XGID=-a--aBD-C--abC---c-cbAbA-A:0:0:-1:00:1:2:0:9:10
on roll, cube action?


Analyzed in Rollout
No Double
Player Winning Chances: 66,94% (G: 32,01% B: 2,48%)
Opponent Winning Chances: 33,06% (G: 7,95% B: 0,60%)
Double/Take
Player Winning Chances: 67,40% (G: 32,20% B: 2,66%)
Opponent Winning Chances: 32,60% (G: 7,93% B: 0,81%)
Cubeless Equities
No Double:+0,616
Double:+1,270
Cubeful Equities
No Double:+0,753 (-0,175)
Double/Take:+0,928
Double/Drop:+1,000 (+0,072)
Best Cube action: Double / Take
Rollout details
1296 Games rolled with Variance Reduction.
Moves and cube decisions: 2 ply
Search interval: Large
Confidence No Double: ± 0,026 (+0,727...+0,780)
Confidence Double: ± 0,041 (+0,887...+0,969)
Double Decision confidence: 100,0%
Take Decision confidence: 100,0%
Duration: 3 minutes 26 seconds

eXtreme Gammon Version: 1.14, MET: GnuBG 11 point



Escaping one checker or getting an advanced anchor is a huge plus for the favorite:

I tried to balance the race gain from escaping by bringing down a checker from the mid, so the race can be compared (more or less) to the previous pos.





is Player 2

score: 2
pip: 135
9 point match
pip: 161
score: 1

is Player 1
XGID=-a---BD-D--acB---c-cbAbA-A:0:0:-1:00:1:2:0:9:10
on roll, cube action?


Analyzed in Rollout
No Double
Player Winning Chances: 71,16% (G: 33,75% B: 2,49%)
Opponent Winning Chances: 28,84% (G: 6,48% B: 0,51%)
Double/Take
Player Winning Chances: 71,35% (G: 35,06% B: 3,20%)
Opponent Winning Chances: 28,65% (G: 6,78% B: 0,75%)
Cubeless Equities
No Double:+0,736
Double:+1,536
Cubeful Equities
No Double:+0,911 (-0,089)
Double/Take:+1,245 (+0,245)
Double/Drop:+1,000
Best Cube action: Double / Drop
Rollout details
1296 Games rolled with Variance Reduction.
Moves and cube decisions: 2 ply
Search interval: Large
Confidence No Double: ± 0,025 (+0,886...+0,936)
Confidence Double: ± 0,039 (+1,207...+1,284)
Double Decision confidence: 100,0%
Take Decision confidence: 100,0%
Duration: 2 minutes 53 seconds

eXtreme Gammon Version: 1.14, MET: GnuBG 11 point






is Player 2

score: 2
pip: 140
9 point match
pip: 166
score: 1

is Player 1
XGID=----bBD-C--abC---c-cbAbA-A:0:0:-1:00:1:2:0:9:10
on roll, cube action?


Analyzed in Rollout
No Double
Player Winning Chances: 68,86% (G: 33,75% B: 2,55%)
Opponent Winning Chances: 31,14% (G: 6,60% B: 0,48%)
Double/Take
Player Winning Chances: 68,44% (G: 35,04% B: 3,10%)
Opponent Winning Chances: 31,56% (G: 6,91% B: 0,72%)
Cubeless Equities
No Double:+0,690
Double:+1,411
Cubeful Equities
No Double:+0,851 (-0,149)
Double/Take:+1,098 (+0,098)
Double/Drop:+1,000
Best Cube action: Double / Drop
Rollout details
1296 Games rolled with Variance Reduction.
Moves and cube decisions: 2 ply
Search interval: Large
Confidence No Double: ± 0,025 (+0,827...+0,876)
Confidence Double: ± 0,040 (+1,057...+1,138)
Double Decision confidence: 100,0%
Take Decision confidence: 100,0%
Duration: 3 minutes 05 seconds

eXtreme Gammon Version: 1.14, MET: GnuBG 11 point

I too have big problems when sitting on the bar and facing a blitz cube. It is very easy to envision all the gammons lost after a Take, and thus get driven into a chicken pass.

I hope these RO help a little to encourage you into taking next time ;-)

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