Author: leonid
Date: 17:58:18 12/19/99
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On December 19, 1999 at 19:42:51, Tom Kerrigan wrote: >On December 19, 1999 at 09:27:18, leonid wrote: >>No, they can sometime but very little. For the sake of clarity will say what I >>mean by "illegal move". Maybe my definition is wrong. I am not used to the >>normal terminology in chess programming. For me "illegal move" is every move >>that is found without checking if the king will be under the fire. Usage of >>"illigal moves" in the ply zero gave me somewhere around 1.5%, if my memory is > >What sort of usage? Meaning that you test for legality after you try to make the >move? Exactly. I find if the move is legal only if it is visible that it have some use. If the move give material advantage less that is already found for this ply it is rejected and not tryed for its legality. That should speed up your program considerably if you do it at every ply. >If you're only doing it at ply 1, that's only a small fraction of your search >time, so it will not make the whole program go much faster. Will be happy if I will find what you mention. Until now it is only inside of ply zero that this work in my logic with some advantage. It is possible that one day I will find how the other people do otherwise. Already few times I went to certain part of my logic and changed it radically. Each time I was surprise why I could not see in it "this simple thing"! As far I a could see, usage of illegal moves in the ply one (above zero) ask as as obligatory thing to find in advance what moves in this ply will go to check. Specific of this ply is that it is very effective if you have all its moves aligned this way: checking moves first, moves that give immidiate material advantage second and at the end the neutral one. This speed ply one tremendously. But additional logic that demand to recognize what move will go to check take already as much time as the logic that will find the legality of each move. I tryed, anyway, "illegal moves" around one month ago, when I read about this here, in ply one and above but failed to find some speed. >>I tryed what in your text I see as LVA, and this fail to give me some speeding. > >If you're already doing MVV, then that's the big speedup. I think LVA only >really helps in a few positions. Good! The idea is so bright and simple that I rushed to try it. Was also surprised that it stayed invisible during all my writing. Was very disappointed when it not worked. For already two last months I am staying at the same place. No speeding for now. > >-Tom
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