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Re: [Bug-gnubg] strange evaluation
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From: |
motiv4u |
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Subject: |
Re: [Bug-gnubg] strange evaluation |
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Date: |
Mon, 6 Jul 2009 01:25:51 +0200 |
On Sun, Jul 5, 2009 at 9:54 AM, Christian
Anthon<address@hidden> wrote:
> This is a known weakness in the eval engine. Bearing in against many
> checkers isn't handled too well.
>
> Christian.
But I think roll outs cover this, don't they?
Even 0-ply roll outs.
N.
>
> On Wed, Jul 1, 2009 at 6:00 AM, Masanori Itikawa<address@hidden> wrote:
>> Hi.all.
>> I find gnubg make strange evaluation in some positions.
>> GNU Backgammon Position ID: YAMHwHu2bR0EAA
>> Match ID : cInsABAAKAAA
>> +13-14-15-16-17-18------19-20-21-22-23-24-+ O: Staf1
>> | X O | O | O | 1 point
>> | O | O | O |
>> | | O | |
>> | | O | |
>> | | | |
>> v| |BAR| | 7 point match (Cube: 1)
>> | | | |
>> | | | O |
>> | O X | | O |
>> | O X | | X X X X X O | Rolled 13
>> | O X X | | X X X X X O | 5 points
>> +12-11-10--9--8--7-------6--5--4--3--2--1-+ X: othello
>> 1. Cubeful 2-ply 13/10 6/5 Eq.: +1.687
>> 0.885 0.730 0.414 - 0.115 0.001 0.000
>> 2-ply cubeful prune [world class]
>> 2. Cubeful 2-ply 8/7 6/3 Eq.: +1.686 ( -0.001)
>> 0.886 0.727 0.414 - 0.114 0.001 0.000
>> 2-ply cubeful prune [world class]
>> 3. Cubeful 2-ply 6/5 6/3 Eq.: +1.674 ( -0.013)
>> 0.884 0.723 0.408 - 0.116 0.000 0.000
>> 2-ply cubeful prune [world class]
>> 23. Cubeful 2-ply 6/3 5/4 Eq.: +1.440 ( -0.246)
>> 0.834 0.690 0.336 - 0.166 0.005 0.000
>> 2-ply cubeful prune [world class]
>> 24. Cubeful 2-ply 8/5 7/6 Eq.: +1.418 ( -0.269)
>> 0.835 0.647 0.411 - 0.165 0.000 0.000
>> 2-ply cubeful prune [world class]
>> My choice was 8/5 7/6. I do not insist that my choice is best, but 13/10
>> 6/5
>> and 8/7 6/3 are clearly not best.
>>
>> GNU Backgammon Position ID: YAMHwHe23RkEAA
>> Match ID : cAnzABAAKAAA
>> +13-14-15-16-17-18------19-20-21-22-23-24-+ O: Staf1
>> | X O | O | O | 1 point
>> | O | O | O |
>> | | O | |
>> | | | |
>> | | | |
>> v| |BAR| | 7 point match (Cube: 1)
>> | | | O |
>> | | | O |
>> | O | | X X O |
>> | O X | | X X X X X O | Rolled 64
>> | O X | | X X X X X O | 5 points
>> +12-11-10--9--8--7-------6--5--4--3--2--1-+ X: othello
>> 1. Cubeful 2-ply 8/2 6/2 Eq.: +1.494
>> 0.849 0.675 0.351 - 0.151 0.000 0.000
>> 2-ply cubeful prune [world class]
>> 2. Cubeful 2-ply 13/7 6/2 Eq.: +1.485 ( -0.009)
>> 0.847 0.669 0.358 - 0.153 0.000 0.000
>> 2-ply cubeful prune [world class]
>> 3. Cubeful 2-ply 13/3 Eq.: +1.315 ( -0.179)
>> 0.812 0.619 0.358 - 0.188 0.000 0.000
>> 2-ply cubeful prune [world class]
>> 4. Cubeful 2-ply 13/9 8/2 Eq.: +1.245 ( -0.249)
>> 0.798 0.607 0.355 - 0.202 0.000 0.000
>> 2-ply cubeful prune [world class]
>> 5. Cubeful 2-ply 8/4 8/2 Eq.: +1.190 ( -0.304)
>> 0.780 0.593 0.345 - 0.220 0.000 0.000
>> 2-ply cubeful prune [world class]
>> 6. Cubeful 2-ply 13/7 8/4 Eq.: +1.071 ( -0.423)
>> 0.755 0.556 0.349 - 0.245 0.000 0.000
>> 2-ply cubeful prune [world class]
>> My choice was 13/7 8/4. Why is this move a super big blunder?
>> GNU Backgammon Position ID: YAMHwHe2uysAAA
>> Match ID : cInpABAAKAAA
>> +13-14-15-16-17-18------19-20-21-22-23-24-+ O: Staf1
>> | O | O | O | 1 point
>> | O | O | O |
>> | | O | |
>> | | | |
>> | | | |
>> v| |BAR| | 7 point match (Cube: 1)
>> | | | O |
>> | | | O |
>> | O | | X X X O |
>> | O | | X X X X X O | Rolled 32
>> | O X X | | X X X X X O | 5 points
>> +12-11-10--9--8--7-------6--5--4--3--2--1-+ X: othello
>> 1. Cubeful 2-ply 6/4 6/3 Eq.: +1.477
>> 0.847 0.666 0.350 - 0.153 0.001 0.000
>> 2-ply cubeful prune [world class]
>> 2. Cubeful 2-ply 5/3 5/2 Eq.: +1.430 ( -0.047)
>> 0.838 0.659 0.346 - 0.162 0.001 0.000
>> 2-ply cubeful prune [world class]
>> 3. Cubeful 2-ply 6/3 4/2 Eq.: +1.421 ( -0.056)
>> 0.836 0.647 0.348 - 0.164 0.000 0.000
>> 2-ply cubeful prune [world class]
>> 15. Cubeful 2-ply 8/6 5/2 Eq.: +1.071 ( -0.406)
>> 0.751 0.535 0.335 - 0.249 0.000 0.000
>> 2-ply cubeful prune [world class]
>> 16. Cubeful 2-ply 8/3 Eq.: +0.923 ( -0.554)
>> 0.715 0.489 0.329 - 0.285 0.000 0.000
>> 2-ply cubeful prune [world class]
>> My choice was 8/3. It may be not best, but It never be a super big blunder.
>> Why is 6/4 6/3 best???
>> I analyzed my match by GNU Backgammon 0.90-mingw 20090625 on Windows xp sp3.
>> _______________________________________________
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>>
>>
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