Author: F. Huber
Date: 08:51:01 01/18/05
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On January 18, 2005 at 10:55:24, Alessandro Scotti wrote: >On January 18, 2005 at 08:41:37, F. Huber wrote: > >>IMO "32000 minus distance" is not a good idea for stating a mate value, since >>this is absolutely non-standard, and so every existing GUI would certainly >>show a completly nonsense mate value! >>I think you should either stay with the distance to 10000 (this is the way that >>TheKing does it), or even better switch to the PGN/EPD-standard evaluation >>of mates, which counts from 32768 - maybe you should have a look at >>http://www.drb.insel.de/~heiner/Chess/PGN_Standard.txt >>and go to the section ´16.2.5.6: Opcode "ce": centipawn evaluation´. > >Hi Franz, >I use 32000 in Kiwi and Arena seems to display the score correctly. I don't >think 10000 or any other number is better or makes work particularly easier for >the GUI. In fact, when I was designing my own GUI, I decided that it was a good >idea to run a simple "mate" and "get mated" test on new engines when possible, >so that returned scores could be compared with known values. Hello Alessandro, I don´t know your engine Kiwi yet (sorry for that ;-)), but now I´ll download and try it, because it sounds rather strange to me, that this value 32000 should work for Arena - Arena doesn´t even recognize the King´s value 10000 correctly and displays a wrong (by 1) mate number for the King, if installed as a Winboard-engine (the value is only ok if installed as UCI engine by the Wb2Uci-adapter, because this interface correctly translates these values). And I can´t agree with you, that _any_ value is suitable for mate scores: we do have a standard (PGN/EPD), but what would a standard be worth, if nobody would keep to it? And furthermore: how should a GUI correctly interpret mate scores, when one engine uses 10000, the next 32000 and an other one 32768, and so on ... ? Regards, Franz.
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