The race evaluation is heaps better than the contact one, but not perfect. If you are worried about a ply 0 error here you will be horrified by the errors in contact situations, and perhaps stop believing in rollouts :). Yet as far as I know GNUbg 0ply (Snowie 1 ply) is the best among the bots, and usually a rollout will not suffer that greatly as it averages over many possible dice sequences.
-Joseph On Tue, Nov 11, 2008 at 1:37 AM, Sven-Olav Norén <[EMAIL PROTECTED]> wrote: > Hi, > > Hope you can read the position below. As you can see GNU makes a big misstep > on 0-ply evaluation. GNU:s choice loses about 80% gammons instead of a > normal gammon saving move that would lose about 40% gammon. GNU corrects > itself on 1-ply and higher levels, so it might have no or small practical > importance. However it bothers me as I often use 0-ply when doing > rollouts. So I'm curious if anyone with inight in the neural nets might have > some explanation or comment. > > > Kind regards > Sven-Olav Norén, Stockholm Sweden > > 2wIAAKuzqgIAAA:MIGpAAAAAAAA > > The score (after 0 games) is: gnubg 0, snoren 0 (match to 5 points) > Match Information: > Date: 2008-11-10 > Move number 3: gnubg to play 32 > GNU Backgammon Position ID: 2wIAAKuzqgIAAA > Match ID : MIGpAAAAAAAA > +12-11-10--9--8--7-------6--5--4--3--2--1-+ O: gnubg > | O O O O O O | | O O O O O | 0 points > | | | O O O | Rolled 32 > | | | O | > | | | | > | | | | > ^| |BAR| | 5 point match (Cube: 1) > | | | | X > | | | | X > | | | | XX > | | | X X X | XX > | | | X X X X | XX 0 points > +13-14-15-16-17-18------19-20-21-22-23-24-+ X: snoren > Pip counts: O 88, X 16 > > Rolled 32: 1. Cubeful 0-ply 4/2 4/1 Eq.: -1,407 > 0,000 0,000 0,000 - 1,000 0,433 0,000 > 2. Cubeful 0-ply 9/6 8/6 Eq.: -1,432 ( -0,025) > 0,000 0,000 0,000 - 1,000 0,459 0,000 > 3. Cubeful 0-ply 9/6 7/5 Eq.: -1,443 ( -0,036) > 0,000 0,000 0,000 - 1,000 0,471 0,000 > 4. Cubeful 0-ply 12/10 9/6 Eq.: -1,446 ( -0,040) > 0,000 0,000 0,000 - 1,000 0,475 0,000 > 5. Cubeful 0-ply 12/9 8/6 Eq.: -1,471 ( -0,065) > 0,000 0,000 0,000 - 1,000 0,501 0,000 > > Output generated Mon Nov 10 13:29:07 2008 > by GNU Backgammon 0.90-mingw (Text Export version 1.91) > > > ________________________________ > Långtråkigt? Mängder av sköna spel att fördriva tiden med! MSN Spelhallen > _______________________________________________ > 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
