Author: Johan de Koning
Date: 18:10:32 09/30/03
Go up one level in this thread
On September 29, 2003 at 05:10:00, Uri Blass wrote: >On September 29, 2003 at 03:13:13, Johan de Koning wrote: >>Anyway, I think I'll skip the experiment with fully normalized TT entries. >>(That's with inactive files removed, and the remaining files flipped/sorted >>into canonical form). That would be good for a complete retrograde analysis, >>but it won't beat alpha-beta on a fixed starting position. > >I do not see a reason that it won't beat alpha beta because it does not mean not >using alpha beta. Sorry, that was a bit unclear. The it in "it won't beat" was intended to mean full retrograde analysis. >If you do normalized TT entries then you need to change your TT to include >numbers instead of moves and when you try hash move first you may calculate the >move based on the number. I'm not sure if you have some kind of magic unique number in mind. As long as normalization is merely shuffling files, there will be an 8<->8 map that transforms the board and the move(s) equally in both directions. Though the move from the search might be mapped to an irrelevant file. >killer moves and history tables if you use them for order of moves do not need >to be changed. IMHO it is more elegant to normalize each position immediately after Make(). In that case killers or whatever global move stats need to be discarded. :-) ... Johan
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