Author: Dave Gomboc
Date: 14:03:51 10/19/02
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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
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