On Sun, Jul 5, 2009 at 9:54 AM, Christian Anthon<[email protected]> 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<[email protected]> > 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. >> _______________________________________________ >> Bug-gnubg mailing list >> [email protected] >> http://lists.gnu.org/mailman/listinfo/bug-gnubg >> >> > > _______________________________________________ > Bug-gnubg mailing list > [email protected] > http://lists.gnu.org/mailman/listinfo/bug-gnubg > > -- "He is no fool who gives up what he cannot keep to gain what he cannot lose." -Jim Elliot _______________________________________________ Bug-gnubg mailing list [email protected] http://lists.gnu.org/mailman/listinfo/bug-gnubg
