Author: John Merlino
Date: 11:36:34 09/21/00
Go up one level in this thread
On September 21, 2000 at 00:48:00, John Merlino wrote: >On September 20, 2000 at 14:31:25, Uri Blass wrote: > >>On September 20, 2000 at 14:12:25, John Merlino wrote: >> >>>On September 20, 2000 at 13:18:20, James wrote: >>> >>>>This position turns out to be an excellent comparitor ofd chessmaster versions. >>>>My puter is 733 Piii, not overclocked with 512 meg of ram. Tested cm55 and cm6k >>>>using cm default but with select 10, and ttables set to 30. results: >>>>cm55 found mate in 14 at 33 min 45 seconds < about 20 sec into ply 13> and at 20 >>>>seconds into ply 13, cm6k still found m n 16 at 58 minutes and 45 seconds. >>>> My play formula on cm55 found it in 31 min and 30 seconds. Am sure other >>>>programs could see it faster, if anyone does any comparitive tests on their >>>>system, would be interested in the results. IF cm8000 is as efficient as cm55, >>>>and has 12 ply selectivity, it could maybe see it in 10 minutes or so i think. >>>> This position seems to be another that begs the question : what is a ply : ? >>> >>>What is the position? I can test it on a Beta build of CM8000.... >>> >>>jm >> >>[D]2r3kr/5pp1/7p/3PQRb1/ppq1B3/8/PPP3PP/1K1R4 w >> >>chessmaster6000(ss=10) found mate in 20 at depth 2/12,mate in 14 at depth 5/15 >>and mate in 13 at depth 6/16 >> >>Uri > >As promised.... > >A beta build of Chessmaster 8000, running on my PIII-600, with only 128 MB RAM, >and only a 1MB hash table, BUT with SS=12, announced mate in 23 after 39 minutes >and 57 seconds. The announcement came at depth 13, after 258,350,432 positions >had been seen (just under 108,000 positions/second). > >Admittedly, this test is not terribly useful if you are trying to compare >results with YOUR testing, because of machine and some settings differences (and >also because I had to actually WORK and couldn't leave the machine idle for some >of the time). > >I'll try running another test overnight, with a 32MB hash table (the most I can >afford on my machine). > >However, there you are.... > >jm The first thing I should mention is that my previous post was incorrect. CM8000 did not announce mate in 23. It was, in fact, mate in 13. See the following explanation for why I made this error.... So, I let it run overnight, with SS=12 and a 32MB hash table. CM8000 announced mate in 14 at depth 13 in 24 minutes and 49 seconds, at about 162 million positions. Depth 14 was reached at 35:46, and mate in 14 was still the eval, but the PV had changed (too long to bother with -- and the point was announcing mate). Depth 15, reached after 2:24:49, announced mate in 13. Depth 16, still showing mate in 13, was reached in 5:08:53 (2.1 billion positions, approximately). As of this writing, after about 13 1/2 hours, depth 17 has not been reached. Oddly enough, the EVAL of the PV at depth 13 was 99.73, which, in OLD versions of Chessmaster (7000 and previous) would mean mate in 27. This vexed me greatly, and begged the question why previous versions of The King announced a mating line with fewer moves in the above position. Thanks to the "Visual Thinking" Window, I have determined that the old Chessmaster method of scoring: (1 - eval) * 100 = mate in N no longer works. In CM8000: (1 - eval) * 100 = number of plies to mate so the new math to determine mate in N would be (((1 - eval) * 100) + 1) / 2 = mate in N. Example, a score of 99.73 (as reached at depth 13 of this example) means mate in 14. So, Chessmaster users take note.... jm
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