Author: Andrew Williams
Date: 02:45:05 08/18/99
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On August 17, 1999 at 19:17:52, Bas Hamstra wrote: >On August 17, 1999 at 13:37:37, Andrew Williams wrote: > >>On August 17, 1999 at 11:18:05, Dan Homan wrote: >> >>>Do any programmer's have experience with Enchanced Transposition Cutoffs? >>>It seems to me that these would be a fair amount of work at each node, but >>>I was wondering if people generally find the payoff to be worth it. >>> >>> - Dan >> >>I've tried it twice in my program and both times found it unhelpful. >>I think it might do better in my program if I tried a stripped-down >>make_move, because I don't need (eg) my incremental updating of attack- >>tables for the ETTC test. >> >>Andrew Williams > >Andrew, that's very interesting that you mention that incremental attacktables. >I've been doing that for a long time (pseudo attacks, ie blocking pieces >ignored) and achieved reasonable speed. About on par with Crafty. It gives a lot >of handy advantes, both in capture generation (plus easy SEE) and eval. For >every square of the board each of the 32 attackbits represented the attacking >piece. > Hello Bas, I think my program would be faster if I ignored blocking pieces in my attack-tables (still nowhere near as fast as crafty, though). But how useful are your attacktables if they ignore blocking pieces? It never occurred to me to do it that way. Surely it wouldn't help your SEE if you don't know if a piece can really attack a square. I'm wondering if you perhaps mean "XRay attacks ignored"? >too stripped and redid my make/unmake. You can't ever go faster than the >make/unmake, how fast it may be. In fact I redid everything and spent a whole >vacation experimenting. I just now made a breakthrough in figuring out which >datastructures are fastest for capture- and attackgeneration. I hope to be able >to tell more soon. Occasionally ideas work in practice too :) > I'd be interested to hear any results you get. Best regards Andrew
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