Author: Christophe Theron
Date: 15:05:21 02/05/01
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On February 05, 2001 at 15:40:21, Paul wrote: >On February 05, 2001 at 12:39:23, Christophe Theron wrote: > >>On February 05, 2001 at 09:15:52, Paul wrote: >> >>>I've been looking through the archives a bit, and came across this mate that Dr. >>>Dann posted a long time ago, it's not too easy, but not too difficult either for >>>top programs (but mine has a hard time finding it :) ... >>> >>>2r3k1/5ppp/7r/Q7/3P1p2/1N3Pnq/PP3K1P/R5R1 b - - >> >>Well this time Tiger took 98s to find the mate in 10. :( >> >>Ne4+... (K6-2 450, 6Mb hash) >> >> >> Christophe > >Well, don't be disappointed Christophe ... mine took 03:12 for a mate in 11 :) > >I've been changing so much in my search the last few days, sometimes it looks >like it's drunk, haha! I just read that Genius 6.5 & CM7000 found a M10 in ~15 >seconds on a p2/400, and there also is a mate in 9 (proven by Chest). > >Ok, I have 2 questions for you, but if you don't want to answer them I >understand completely, just can't resist. :) > >1. Is your QSearch relatively simple like mine, or do you extend/look at >check(evasion)s etc in there like Ed seems to do? My QSearch is much more complex than that. >2. I'm going to convert my movegen to 16x12 any day now (like you have if I >remember correctly). One thing I don't like is that some arrays get twice as >big, like the history one and the ones for piece-hash-value-lookups. It's >possible to prevent that by calculation, but do you have any recommendations? You can have smaller arrays by first converting the 16x12 coordinate into a 0..63 coordinate. It just takes one array lookup, it not very expensive and very cache-friendly. >Wish we had palmtrees over here in Amsterdam :) I understand! :) Christophe
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