Author: guy haworth
Date: 02:54:39 04/21/01
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ICGA_J v23.4 (Dec. 2000) gives a clue in two articles by Frederic Friedel. In June 2000, Fritz competed in Frankfurt on a Fujitsu Siemens Primergy N800 computer with 8 processors @ 700MHz each. Fritz was working at 2.8M nps. Fritz's Performance Rating in the tournament (after a 5-5 score) was ELO 2750. The following month, Junior 6 competed in Dortmund under 40/2 conditions on an 8-processor Fujitsu Siemens Primergy machine at 2.8M nps - perhaps the same machine. Junior 6 also scored 50% for a tournament rating of 2703. Ken Thompson in an article way back said that 6x more power was required to gain 1 ply in search depth. I put this '6' alongside an assumed fan-out rate of 36 and the square-root factor provided by a search method using alpha-beta cutoffs to the maximum. Others may have views about the '36' and the alpha-beta contribution. What are others' current figures equating nps and search-depth? G
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