Author: Uri Blass
Date: 03:35:35 12/04/05
Go up one level in this thread
On December 04, 2005 at 06:11:47, Reinhard Scharnagl wrote: >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. Thanks This explain the numbers in the original post. Note that I do not understand what is double discovered check. I do not know about double checks when a piece that moved does not give check. I can think about promotion but even in the diagram that I give axb8=R+ is a check by the pawn that moved and became a rook so it is double check by a piece that moved. [D]kr6/P7/R7/8/8/8/8/K7 w - - 0 1 Uri
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