Author: John Merlino
Date: 11:40:21 02/10/01
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On February 10, 2001 at 05:46:55, Brian Kostick wrote: >On February 09, 2001 at 22:42:23, John Merlino wrote: > >>Chessmaster takes four factors into account: >> >>1) An estimate of the base USCF rating of the engine on default settings on the >>minimum spec machine (Pentium II-233). >>2) A determination of the processor speed at runtime (done every time the >>program starts up, which is why you can get different ratings for the same >>personalities). This equates into a "bonus ELO" which is applied to varying >>degrees to all ratings. This variation is based on.... >>3) How close the personality's strength is to 100. The farther away it is from >>100, the less of the bonus it gets. >>4) Additionally, personalities that have a fixed search depth get NO CPU speed >>bonus. This would seem incorrect, because some personalities could have a fixed >>depth of 20, and it would appear that a max depth of 20 would take a long time >>to reach. However, the only personalities that DO have a fixed search depth less >>than the maximum all have a depth of 6 or less, which is reached very quickly. >>Therefore, these personalities get no bonus. >> >>Of course, it's all just an estimation. In my opinion, the formula of (each >>doubling of CPU speed = 70 ELO points) is probably not as valid as it was 3 or 4 >>years ago when it was first introduced to the development team. Maybe it's more >>like 40-50 now, if that. But, the team has seen no reason to change it, yet.... >> >>jm > >John, > Just for conversations sake... That published formula is/was: >[Base Rating] + 70 * ln([Your CPU Speed] / [Base CPU Speed]) / ln(2) > > and [Base CPU Speed] was given as 90(mhz). Is it correct to say that it was >raised to 233 somewhere along the line? > >Thanks, >bk The reason it was raised is because the minimum spec machine was raised. In Chessmaster 6000, it was a Pentium 90. In CM8000, it's a PII-233. jm
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