Author: Uri Blass
Date: 14:27:43 10/19/02
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On October 19, 2002 at 17:03:51, Dave Gomboc wrote: >On October 19, 2002 at 14:45:19, Steve Lim wrote: > >>SJLIM: Alot of programmers on CCC have asked me to ask you this.. for >>clarification.. >>SJLIM: Please explain search depths for the notations 4(5) and clarify earlier >>comments about 12(6). This may include indicating what is "normal full width" >>searching, extensions, quiesence search, or other types of searching DB2 >>utilized, and which was done in software versus in the hardware chess chips. >>SJLIM: Also, what types of pruning were used. This topic has generated enourmous >>discussion on CCC. >>CrazyBird: 4(5)means the same thing. 5-ply maximum hardware depth, although it >>is obviously impossible in this case. >>CrazyBird: since the brute force depth is 4. >>CrazyBird: i can't really go into the details of the hardware pruning. it is >>related to method of analogy pruning, or rather a basterized form of it. >>CrazyBird: limitation in the contract with ibm. >>SJLIM: Can this be answered? - Does 12(6) mean the 6 is included _in_ the 12, or >>in addition to the 12? >>CrazyBird: 6 is part of 12, but the hardware can search less than 6, that is the >>software horizon may be more than 6 plies. >>CrazyBird: and of course, the selective depth can be arbitrarily deep, well, no >>more than 8 times brute force. >>CrazyBird: argh, the q search. it is in hardware. both sides are allowed checks >>in quiescence search. max is 8, i think. > >Clearly, Vincent's interpretation is supported here. > >I'm still sure they were searching much deeper than 12 ply in important lines >though! > >Dave Of course and it is the case for every program. They probably searched more important lines than Fritz so I do not think that their 12 plies are eqvivalent to fritz's 12 plies but I still strongly believe that their 12 plies are not more than Fritz's 14 plies and Fritz can search more than 14 plies in the middle game with fast hardware so I guess that Fritz with fast hardware is better. Uri
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