Author: Uri Blass
Date: 05:25:56 05/05/01
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. 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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