Author: Bas Hamstra
Date: 17:58:15 09/08/99
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I tried Bruces idea to play SEE<0 the very last. When I run the wac suite I think it chokes on some positions. I like your scheme better, overall. I played *all* captures before the killer(s), until yesterday. Doing the killers in between is definitely a big win... Another thing: I asked Bruce if it is a good idea to just skip nullmove the last R ply. Some do that, I know at least 2 persons who do. Idea being to not allow nullcuts on the basis of qsearch alone. So far I find it finds only very few wac positions extra, with a worse branching factor. Also you do a lot more qnodes, but less nodes in total. I think it's not such a good idea, after all. Regards, Bas Hamstra. Regards, Bas Hamstra. On September 07, 1999 at 10:45:37, Robert Hyatt wrote: >On September 07, 1999 at 02:41:02, Alessandro Damiani wrote: > >>Hi Bob! >> >>Some time back you wrote here on CCC about the move ordering of Crafty. I don't >>want to download all archive files, so I ask you now. >> >>If I remember it right, you use a SEE to order captures in the search. The >>negative captures (SwapOff(.)<0) are placed after ALL the other moves? >> >>I thought, the "state of the art" is: >> >>1. transposition table move >>2. positive captures (MVV/LVA) >>3. killer 1 >>4. killer 2 >>5. counter move >>6. rest of captures (MVV/LVA) >>7. history moves >>8. rest of moves (static ordering) >> > > >I do it like this: > >1. transposition move >2. positive captures sorted by SEE score (best capture first) >3. killer 1 >4. killer 2 >5. history moves (4) >6. rest of moves, which just happens to do remaining captures first > since they were generated first. > >I don't do 'counter-move' as I didn't find any benefit at all. > > > > >>I define "positive capture" this way: >>Val(aggressor)<Val(victim) OR NOT Attacked(opponent, move.to). >> >>You said that the SEE gives you a better move ordering when the negative >>captures are put after number 8? > > >If I did, I wrote poorly... The 'rest of the captures' come after the >history moves, because they are still at the front of the move list, and >after I give up on 'history moves' I just take the move list in order. > > > >> >>Thank you! >> >>Alessandro (new E-mail address since today: adamiani@econophone.ch)
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