Author: leonid
Date: 16:40:18 11/28/99
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On November 28, 1999 at 18:36:46, Dave Gomboc wrote: >On November 28, 1999 at 16:30:46, leonid wrote: > >>On November 28, 1999 at 15:00:19, Dave Gomboc wrote: >> >>>On November 28, 1999 at 14:05:01, leonid wrote: >>> >>>>Hi, >>>> >>>>For those who spoke about the difference between "legal", "illegal" moves based >>>>logic. Question was: What logic will be more rapid? After my trial, legal moves >>>>based logic do the best. Difference insignificant and is around 4%. >>>> >>>>What exactly was changed and where? >>>> >>>>1) Before only ply zero had illegal moves based logic. All other plys used legal >>>>moves logics. >>>> >>>>2) Were changed three plys over ply zero to see the difference. >>>> >>>>3) Tryed both logics for speed 8 plys deep, brute force, same positions. No >>>>extensions. >>>> >>>>4) In illegal moves based logic all old alignment procedures are the same. For >>>>instance, procedure that put "checking moves" at the head of moves line. This >>>>last procedure is as much big and time consuming, as the procedure that before >>>>watched for legality of all moves in a ply. >>>> >>>>Leonid. >>> >>>I'm not sure why you would force the checking moves to be searched first. Use >>>your standard sorting order for the moves. Searching checks first is going to >>>be bad, compared with e.g. searching promising captures first. >>> >>>Dave >> >>It is not the fantasy setting that I had in my moves alignment. In my usual >>logic (only ply zero use illegal moves, all other plys legal) this give big >>speed improvement. Don't forget one obvious fact, you must put at the head of >>your moves line those that lead to the biggest material advantage ever. And >>checking moves do right this. Not all the time, and this is where everything can >>be lost in confusion. Only statistics can clean it up to the "final truth" and >>offer us its final picture. For me, this was already done. >> >>Leonid. > >Lines that lead to the biggest material advantage ever usually contain captures >like "knight takes queen", not "queen to h7, check". If you're solving for >checkmates, it might be quite reasonable to search checks first. But if you're >just searching to find the best move, checks are not typically first on the >list. > >Dave As strange as it can sound to you, this is the truth. This move ordering is the best when searching for mate or material advantage. Even if the mate don't existe for sure in given position, mate will be calculated repeatedly by your logic. When your moves ordering will be right, all the responses will come at more expidient pace. Leonid.
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