How are the ratings for the computer personalities calculated?
The rating for the Chessmaster personality is based on several factors: the Swedish Rating List (SSDF) for the engine in Chessmaster 6000 on a Pentium 90 processor, an estimation of the strength of the NEW version of The King, based on the SSDF’s rating of the OLD version, and several thousand computer vs. computer and human vs. computer games. The SSDF rating was converted from the Swedish scale to the U.S. scale and an adjustment was made for later improvements to the chess engine. Then a series of computer vs. human and computer vs. computer tournaments were played (a total of almost 14,000 games, about 3,000 of which were human vs. computer) at a time control of Fischer 5/10 (five minutes, plus 10 seconds for each move). The results of these games were fed into a ratings calculator. Each of the personalities has a base rating as measured on a Pentium II-233 (the minimum spec processor for Chessmaster 8000). When you run Chessmaster 8000 on your system, the program performs a CPU be
