And playing a single match I stumbled on yet another case
(though much less spactacular than the previous one).
GNU Backgammon Position ID: rG3IAEzY5g1DAA
Match ID : UQngAAAAEAAA
+24-23-22-21-20-19------18-17-16-15-14-13-+ O: gnubg
| O O O O | O | O X O X | 0 points
| O O O | | O X |
| | | |
| | | |
| | | |
| |BAR| |v 7 point match
| | | |
| | | X |
| | | X |
| O X X X | | X X O | On roll
| O X X X | | X X O | 2 points
+-1--2--3--4--5--6-------7--8--9-10-11-12-+ X: MaX (Cube: 2)
Cube analysis
0-ply cubeless equity +0.833 (Money: +0.819)
0.783 0.273 0.016 - 0.217 0.035 0.000
Cubeful equities:
1. Double, take +0.972
2. Double, pass +1.000 ( +0.028)
3. No double +0.902 ( -0.070)
Proper cube action: Redouble, take
Cube analysis
1-ply cubeless equity +0.917 (Money: +0.900)
0.804 0.299 0.018 - 0.196 0.024 0.001
Cubeful equities:
1. Double, pass +1.000
2. Double, take +1.122 ( +0.122)
3. No double +0.970 ( -0.030)
Proper cube action: Redouble, pass
Cube analysis
2-ply cubeless equity +0.832 (Money: +0.819)
0.783 0.268 0.016 - 0.217 0.031 0.000
Cubeful equities:
1. Double, take +0.976
2. Double, pass +1.000 ( +0.024)
3. No double +0.933 ( -0.043)
Proper cube action: Redouble, take
Cube analysis
3-ply cubeless equity +0.899 (Money: +0.883)
0.801 0.288 0.018 - 0.199 0.024 0.001
Cubeful equities:
1. Double, pass +1.000
2. Double, take +1.097 ( +0.097)
3. No double +0.988 ( -0.012)
Proper cube action: Redouble, pass
Cube analysis
4-ply cubeless equity +0.829 (Money: +0.815)
0.779 0.271 0.016 - 0.221 0.030 0.000
Cubeful equities:
1. Double, take +0.950
2. Double, pass +1.000 ( +0.050)
3. No double +0.930 ( -0.020)
Proper cube action: Redouble, take
Position ID: rG3IAEzY5g1DAA
Match ID: UQngAAAAEAAA
Evaluator: Contact
Win W(g) W(bg) L(g) L(bg) Equity Cubeful
static: 0.783 0.273 0.016 0.035 0.000 +0.833 +0.902
1 ply: 0.804 0.299 0.018 0.024 0.001 +0.917 +0.970
2 ply: 0.783 0.268 0.016 0.031 0.000 +0.832 +0.933
3 ply: 0.801 0.288 0.018 0.024 0.001 +0.899 +0.988
4 ply: 0.779 0.271 0.016 0.030 0.000 +0.829 +0.930
MaX.
Massimiliano Maini/NCE/AMADEUS wrote on 26/02/2009 10:23:08:
> Hi all,
>
> on bgonline this cube decision has been posted and the evals returned by
gnubg
> are crazy on even ply:
>
> GNU Backgammon Position ID: XgAAILftgAARAA
> Match ID : AQEAAAAAAAAA
> +-1--2--3--4--5--6-------7--8--9-10-11-12-+ O: gnubg (Cube: 2)
> | O O O O O | | | 0 points
> | O O O O O | | | On roll
> | O O | | |
> | | | |
> | | | |
> | |BAR| |^
> X | | | |
> XX | X | | |
> XX | X | | |
> XX | X | | |
> XX | O X X O | X | O | 0 points
> +24-23-22-21-20-19------18-17-16-15-14-13-+ X: MaX
>
> The original one was in ma match, with score 9aw-9aw: I changed it to
money
> to simplify since it doesn't make any difference.
>
> Cube analysis
> 0-ply cubeless equity +0.190
> 0.610 0.000 0.000 - 0.390 0.027 0.003
> Cubeful equities:
> 1. No double +0.398
> 2. Double, pass +1.000 ( +0.602)
> 3. Double, take +0.116 ( -0.282)
> Proper cube action: No redouble, take (31.9%)
>
> Cube analysis
> 1-ply cubeless equity +0.464
> 0.747 0.000 0.000 - 0.253 0.027 0.003
> Cubeful equities:
> 1. Double, take +0.756
> 2. Double, pass +1.000 ( +0.244)
> 3. No double +0.695 ( -0.062)
> Proper cube action: Redouble, take
>
> Cube analysis
> 2-ply cubeless equity +0.245
> 0.637 0.000 0.000 - 0.363 0.026 0.003
> Cubeful equities:
> 1. No double +0.462
> 2. Double, pass +1.000 ( +0.538)
> 3. Double, take +0.244 ( -0.218)
> Proper cube action: No redouble, take (28.9%)
>
> Cube analysis
> 3-ply cubeless equity +0.503
> 0.765 0.000 0.000 - 0.235 0.025 0.003
> Cubeful equities:
> 1. Double, take +0.844
> 2. Double, pass +1.000 ( +0.156)
> 3. No double +0.796 ( -0.048)
> Proper cube action: Redouble, take
>
> Cube analysis
> 4-ply cubeless equity +0.288
> 0.658 0.000 0.000 - 0.342 0.025 0.003
> Cubeful equities:
> 1. No double +0.532
> 2. Double, pass +1.000 ( +0.468)
> 3. Double, take +0.342 ( -0.189)
> Proper cube action: No redouble, take (28.8%)
>
> Position ID: XgAAILftgAARAA
> Match ID: AQEAAAAAAAAA
> Evaluator: Crashed
> Win W(g) W(bg) L(g) L(bg) Equity Cubeful
> static: 0.610 0.000 0.000 0.027 0.003 +0.190 +0.398
> 1 ply: 0.747 0.000 0.000 0.027 0.003 +0.464 +0.695
> 2 ply: 0.637 0.000 0.000 0.026 0.003 +0.245 +0.462
> 3 ply: 0.765 0.000 0.000 0.025 0.003 +0.503 +0.796
> 4 ply: 0.658 0.000 0.000 0.025 0.003 +0.288 +0.532
>
> Cubeless winning chances swing a lot between even and odd plies, while
> gammon and backgammon percentages are very stable.
> Notice that even W% increase 0/2/4ply, but so do odd ones 1ply/3ply.
>
> Can we still blame this on odd-even effect ?
>
> MaX.
>
> P.S.
> The thread on bgonline is this one:
>
> http://www.bgonline.org/forums/webbbs_config.pl?noframes;read=35362
>
> Neil said that it wasn't worth to do a 2ply cube rollout since the
results
> would be garbage, due to the fact 2ply eval screws this position big
time.
> However, the (stopped) rollout 2ply chequer/2ply cube gave the same
result
> as the (stopped) rollout 2ply chequer/3ply cube and both were similar to
3ply
> eval. Rollout/eval figures are in this post:
>
> http://www.bgonline.org/forums/webbbs_config.pl?noframes;read=35416_______________________________________________
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