Yes, O being closed out has no move decisions to make, and is far from double or re-doubling if he takes - so such positions were not part of the training.
On Wed, Aug 26, 2009 at 7:45 PM, Massimiliano Maini <[email protected]>wrote: > > > >De : Joseph Heled <[email protected]> > > > >That is why getting a strong 0-ply is of the utmost importance. > >I am not sure what is the state of other bots. > > We do agree on this, getting a strong 0ply NN is a must. > Actually that's why I was inquiring to know if the training > methodology of gnubg NN could be responsible of this kind of > behavior. > > This whole odd/even effect thing seems to be much more visible > in gnubg than in other bots and it's the source of (possibly wrong) > beliefs like "gnubg 3ply cube is worse/better than 2ply cube" > or "2ply cube is worse/better than 3ply cube for closed out > positions" etc. > > In the particular position (which is an extreme case): > > GNU Backgammon Position ID: DwAAsN22AYgAAA > Match ID : MAHgAAAAAAAA > +-1--2--3--4--5--6-------7--8--9-10-11-12-+ O: gnubg > | O O O O O O | | | 0 points > | O O O O O O | | | On roll > | O | | | > | | | | > | | | | > | |BAR| |^ 7 point match (Cube: 1) > X | | | | > XX | X | | | > XX | X | | | > XX | X | X | | > XX | X O | X | O | 0 points > +24-23-22-21-20-19------18-17-16-15-14-13-+ X: MaX > > O on roll: > Position ID: DwAAsN22AYgAAA > Match ID: MAHgAAAAAAAA > Evaluator: Crashed > Win W(g) W(bg) L(g) L(bg) Equity Cubeful > static: 76.8 0.0 0.0 0.1 0.0 +0.534 +0.785 > 1 ply: 88.0 0.0 0.0 0.1 0.0 +0.759 +0.923 > 2 ply: 79.7 0.0 0.0 0.1 0.0 +0.593 +0.999 > 3 ply: 87.7 0.0 0.0 0.0 0.0 +0.754 +1.000 > 4 ply: 82.0 0.0 0.0 0.0 0.0 +0.639 +1.000 > > BGBlitz has: > > O on move: (Plies are starting with 1, so it's gnubg 0/1/2-ply) > > 1-ply Green 83.0 0.0 0.0 > > 2-ply Green 81.9 0.0 0.0 > > 3-ply Green 84.4 0.0 0.0 > > > So BGBlitz too has some swinging between odd and even plies, but > the amplitude is 2-4%, not 12%. Snowie seems to behave like BGBlitz, > just 2-3% swing. > > MaX. > > > > > >
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