Author: Uri Blass
Date: 03:00:30 12/04/05
Go up one level in this thread
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
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