Author: Robert Hyatt
Date: 07:36:31 05/05/01
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On May 05, 2001 at 08:25:56, Uri Blass wrote: >There is a possibility to set selectivity of Deep Fritz to 0 and it means that >Fritz avoid null move pruning. > >The interesting question is how many effective plies are lost from null move >pruning. > >Some results suggest that not very much > >Tiger14(depth3)-Deep Fritz(selectivity=0,depth 3)35-15(6 draws) >Tiger14(depth4)-Deep Fritz(selectivity=0,depth 4) 31-19(8 draws) >Tiger14(depth 8)-Deep Fritz(selectivity=0,depth 8) 20-23(12 draws) is going to >be finished in an hour. > >The results without null pruning were not significantly better and at depth 3 it >is not clear if selectivity=0 is productive because tiger could win only >34.5-15.5 against selectivity=2. > Null-move gains at least 2 plies. But it loses some as well, as a 3 ply search with null move is not as good as a 3 ply search without... >Fritz at depth d+1 at the default setting(selectivity=2) seems to be clearly >better than Fritz at depth d(selectivity=0) at small depthes. > >I guess that at big depthes it changes but d=8 is not enough. > >Uri
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