Author: F. Huber
Date: 09:13:23 01/18/05
Go up one level in this thread
On January 18, 2005 at 11:51:01, F. Huber wrote: >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. Now after installing and trying Kiwi under Arena I can actually say, that its mate values are NOT correctly shown - look at the following table, where I´ve tested a few simple mate positions: mate: Kiwi-value --> Arena shows #1 19999 --> +M0 #2 19997 --> +M1 #3 19995 --> +M2 #4 19993 --> +M3 ... BTW you´re using 20000, but not 32000 - again a new (private) ´standard´!? ;-) Franz.
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