Author: Reinhard Scharnagl
Date: 03:11:47 12/04/05
Go up one level in this thread
On December 04, 2005 at 06:00:30, Uri Blass wrote: >On December 04, 2005 at 05:32:13, Reinhard Scharnagl wrote: > >>On December 04, 2005 at 05:25:43, Uri Blass wrote: >> >>>On December 03, 2005 at 23:39:19, chandler yergin wrote: >>> >>>>All expressions of great Joy. >>>>"Eureka cried the ancient Philosopher! The religious have an Epiphany! >>>>I just had another Beer.. and it came to me! >>>>I finally understand.. (I think) what you guys are doing, and want to do better. >>>>(If I don't I'm sure you'll tell me. >>>>;) >>>>You need a way to Test your Engines; and Tweak them and have irrefutable >>>>evidence of performance. In other words, a "Benchmark"; a Baseline for >>>>comparison purposes. >>>>Most of you use Test Positions! The problem there is, that every Engine will >>>>evaluate a poition differently. >>>>What is the one thing in Chess that will never change? >>>>What is the one Constant that will never change? >>>> >>>>The number of "possible" moves at various Ply Levels! >>>>Here they are: >>>> >>>> 0 1 >>>>ply 1 20 >>>>ply 2 400 >>>>ply 3 8890 >>>>ply 4 196812 >>>>ply 5 4838258 >>>>ply 6 118251225 >>>>ply 7 3162798012 >>>>ply 8 84029997363 >>>>ply 9 2403434332264 >>>>ply 10 68265214423776 >>>>ply 11 2058141026024096 >>> >>>correct numbers can be productive for programmers to check bugs but >>>your numbers are not correct >>> >>> >>>A table of perft results for the start position: >>>1 20 >>>2 400 >>>3 8,902 >>>4 197,281 >>>5 4,865,609 >>>6 119,060,324 >>>7 3,195,901,860 >>>8 84,998,978,956 >>>9 2,439,530,234,167 >>>10 69,352,859,712,417 >>> >>>Source >>> >>>http://homepages.caverock.net.nz/~peter/perft.htm >>> >>>Note that I do not plan to respond to every post that I disagree with you and it >>>is a waste of time if you try to teach people in subjects that they know more >>>than you. >> >>Hi Uri, >> >>those seems to be numbers of DIFFERENT POSITIONS not of POSSIBLE MOVES. >> >>Reinhard. > >Hi Reinhard, > >I do not know what chandler yergin means by possible moves but his first 3 >numbers are exactly the number of different games of 0 ply,1 ply,2 ply. > >The perft numbers are not numbers of different positions but number of possible >games. > >1.e4 e6 2.d4 and 1.d4 e6 2.e4 lead to exactly the same position and there are >many examples so the number that I gave for 3 plies is not the number of >possible positions after 3 plies but the number of possible games with 3 plies. > >Uri Hi Uri, have a look at http://www.cs.berkeley.edu/~flab/chess/statistics-games.html Reinhard.
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