日本バックギャモン協会

Cube analysis
2-ply cubeless equity  +0.7138 (Money:  +0.7309)
  0.6897 0.4067 0.0768 - 0.3103 0.1288 0.0032
Cubeful equities:
1. No double            +0.6292
2. Double, pass         +1.0000  ( +0.3708)
3. Double, take         +0.4355  ( -0.1937)
Proper cube action: No double, take (34.3%)

Cube analysis
2-ply cubeless equity  +0.7909 (Money:  +0.7309)
  0.6897 0.4067 0.0768 - 0.3103 0.1288 0.0032
Cubeful equities:
1. Double, take         +0.8253
2. Double, pass         +1.0000  ( +0.1747)
3. No double            +0.7336  ( -0.0917)
Proper cube action: Double, take

Cube analysis
2-ply cubeless equity  +0.7418 (Money:  +0.7309)
  0.6897 0.4067 0.0768 - 0.3103 0.1288 0.0032
Cubeful equities:
1. Double, take         +0.9504
2. Double, pass         +1.0000  ( +0.0496)
3. No double            +0.7253  ( -0.2252)
Proper cube action: Double, take

Cube analysis
2-ply cubeless equity  +0.7673 (Money:  +0.7307)
  0.6900 0.4057 0.0768 - 0.3100 0.1287 0.0032
Cubeful equities:
1. Double, pass         +1.0000
2. Double, take         +1.1629  ( +0.1629)
3. No double            +0.7846  ( -0.2154)
Proper cube action: Double, pass

Cube analysis
2-ply cubeless equity  +0.0875 (Money:  +0.0070)
  0.4920 0.2585 0.0107 - 0.5080 0.2271 0.0192
Cubeful equities:
1. Double, take         +0.8535
2. Double, pass         +1.0000  ( +0.1465)
3. No double            +0.5924  ( -0.2611)
Proper cube action: Redouble, take

Cube analysis
2-ply cubeless equity  +0.7306
  0.6901 0.4053 0.0767 - 0.3099 0.1286 0.0031
Cubeful equities:
1. Double, pass         +1.0000
2. Double, take         +1.2504  ( +0.2504)
3. No double            +0.8722  ( -0.1278)
Proper cube action: Redouble, pass

結論から言うと、No double/Takeで、実戦ではDouble/Passでした。
[code]
Cube analysis
2-ply cubeless equity +0.7138 (Money: +0.7309)
0.6897 0.4067 0.0768 - 0.3103 0.1288 0.0032
Cubeful equities:
1. No double +0.6292
2. Double, pass +1.0000 ( +0.3708)
3. Double, take +0.4355 ( -0.1937)
Proper cube action: No double, take (34.3%)
[/code]

METの扱いが鍵です。ただ、通常のそれにくらべて難易度が高いです。

[img]http://image.backgammonbase.com/image?gnubgid=uW6CATB224ABYA:cAlgARAAKAAA&height=300&width=400&css=nature&format=png[/img]
[code]
Cube analysis
2-ply cubeless equity +0.7909 (Money: +0.7309)
0.6897 0.4067 0.0768 - 0.3103 0.1288 0.0032
Cubeful equities:
1. Double, take +0.8253
2. Double, pass +1.0000 ( +0.1747)
3. No double +0.7336 ( -0.0917)
Proper cube action: Double, take
[/code]

[img]http://image.backgammonbase.com/image?gnubgid=uW6CATB224ABYA:cAlgARAAIAAA&height=300&width=400&css=nature&format=png[/img]
[code]
Cube analysis
2-ply cubeless equity +0.7418 (Money: +0.7309)
0.6897 0.4067 0.0768 - 0.3103 0.1288 0.0032
Cubeful equities:
1. Double, take +0.9504
2. Double, pass +1.0000 ( +0.0496)
3. No double +0.7253 ( -0.2252)
Proper cube action: Double, take
[/code]

[img]http://image.backgammonbase.com/image?gnubgid=uW6CATB224ABYA:cAlgARAAGAAA&height=300&width=400&css=nature&format=png[/img]
[code]
Cube analysis
2-ply cubeless equity +0.7673 (Money: +0.7307)
0.6900 0.4057 0.0768 - 0.3100 0.1287 0.0032
Cubeful equities:
1. Double, pass +1.0000
2. Double, take +1.1629 ( +0.1629)
3. No double +0.7846 ( -0.2154)
Proper cube action: Double, pass
[/code]

BGOnline（http://www.bgonline.org/forums/webbbs_config.pl?read=67362）でPaul Weaverが
[quote]
I have a theory, although I have not yet dared to share it with anyone, that cube action in a match may be dependent on the match score.

In other words, when one side trails by a significant margin, it may be correct for him to take a position that is a huge pass for money. This is especially true if there are a lot of gammons involved.

At this score, 10-away/5-away, the trailer can take a ridiculous position like this one, provided that he understands he does not need to be a favorite to redouble to 4. After taking, the trailer cannot be timid or bashful about redoubling to 4 on the smallest of pretenses.
[/quote]
事実、25%のダンスでredoubleが返ります。
[img]http://image.backgammonbase.com/image?gnubgid=dtuAAWC5boIBMA:AQFgARAAMAAA&height=300&width=400&css=nature&format=png[/img]
[code]
Cube analysis
2-ply cubeless equity +0.0875 (Money: +0.0070)
0.4920 0.2585 0.0107 - 0.5080 0.2271 0.0192
Cubeful equities:
1. Double, take +0.8535
2. Double, pass +1.0000 ( +0.1465)
3. No double +0.5924 ( -0.2611)
Proper cube action: Redouble, take
[/code]
参考図(Moneyの場合, jacobyを回避するためにcube positionが違います)
[img]http://image.backgammonbase.com/image?gnubgid=uW6CATB224ABYA:UQkAAAAAAAAA&height=300&width=400&css=nature&format=png[/img]
[code]
Cube analysis
2-ply cubeless equity +0.7306
0.6901 0.4053 0.0767 - 0.3099 0.1286 0.0031
Cubeful equities:
1. Double, pass +1.0000
2. Double, take +1.2504 ( +0.2504)
3. No double +0.8722 ( -0.1278)
Proper cube action: Redouble, pass
[/code]

[img]http://image.backgammonbase.com/image?gnubgid=uW6CATB224ABYA:cAlgARAAMAAA&height=300&width=400&css=nature&format=png[/img]