Author: Pallav Nawani
Date: 03:21:14 05/30/05
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On May 30, 2005 at 02:02:49, Amir wrote: >Deep Blue could calculate 200 million moves per second. According to what I have >read, Hydra calculates 40 million moves per second. How then is Hydra sees >deeper or is faster than Deep Blue, as is claimed by the authors?? According to the logs that I saw, deep blue was searching 12 plies deep in the K-DB match. My program can match that depth on a 1.1Ghz PC. This is because of search techniques that were not used in deep blue. Eg: Null move, Rebel style reductions, aggressive pruning. Hydra is obviously using such search techniques, and given its higher processing power, it will easily outsearch Deep Blue. In fact, in Shredder-Hydra match, shredder was searching to 16 ply (I think, but I could be wrong) which was almost the same as Hydra (Again, not sure). Also, Deep Blue was using Singular Extensions, which increases the number of nodes required in search. Also note that 9 plies of program 1 are not the same as 9 plies of program 2. These programs may be using different search techniques/extensions etc, and therefore on basis of plies searched you cannot guess the relative strength of programs. For instance, singular extensions are reputed to increase tactical strength quite a bit, but they may decrease the depth of search. Pallav
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