Remind me, What is -16.74 in "chequer play cost -16.74"? -Thanks, Joseph
On Mon, 8 Jul 2024 at 05:37, Philippe Michel <philippe.mich...@free.fr> wrote: > On Tue, Jun 25, 2024 at 06:07:15AM +1200, Joseph Heled wrote: > > > Move filters are very tricky. > > I am pretty sure the testing I did 20+ years ago, when I developed them, > > should be repeated with the current net and taking the huge advance in > cpu > > speed into account. > > I just ran some experiments to see how adding some filtering at 1 ply > and/or making the filters narrower would improve speed and what the > accuracy cost would be. > > As a baseline, World class and Supremo are respectively: > > Move filter for 2 ply: > keep the first 0 0-ply moves and up to 8 more moves within equity 0.16 > Skip pruning for 1-ply moves. > > and > > Move filter for 2 ply: > keep the first 0 0-ply moves and up to 16 more moves within equity 0.32 > Skip pruning for 1-ply moves. > > The chequer play errors cost in the Depreli benchmark and timing for a > small sample of matches analyses are: > > World class chequer play cost -16.74 38.72s > Supremo chequer play cost -16.14 70.39s > > Supremo is only slightly better but almost twice as slow. > > > Filtering at 1ply looks promising. Various settings gave results varying > from close to Supremo in strength and WC in speed: > > chequer play cost -16.10 40.94s > > to close to WC in speed but substantially faster: > > chequer play cost -16.74 29.08s > > The one I liked best is at the average in strength but 20% faster than WC > and more than twice as Supremo: > > chequer play cost -16.45 31.74s > > Move filter for 2 ply: > keep the first 0 0-ply moves and up to 12 more moves within equity 0.24 > keep the first 0 1-ply moves and up to 6 more moves within equity 0.12 > > > There is probably less potential at 3ply (or 4, not tested). The filter > is: > > Move filter for 3 ply: > keep the first 0 0-ply moves and up to 16 more moves within equity 0.32 > Skip pruning for 1-ply moves. > keep the first 0 2-ply moves and up to 4 more moves within equity 0.08 > > and I would be reluctant to decrease "more moves" to less that 4, the > tightening would be limited to "within equity". > > Still, a filter like: > > Move filter for 3 ply: > keep the first 0 0-ply moves and up to 16 more moves within equity 0.32 > keep the first 0 1-ply moves and up to 8 more moves within equity 0.16 > keep the first 0 2-ply moves and up to 4 more moves within equity 0.06 > > is almost 20% faster with no significant change in strength (less than > 1% in the Depreli benchmark, no change at all in the sample match > analyses final result). > > > If you or other list subscribers have suggestions, I can easily test > 2ply setups (running the benchmark takes a few minutes) or 3ply ones > (takes 1 hour), but 4 ply would need about one day. > >
