The 20th World Computer-Chess Championship will take place from August 12 - 18, 2013 in Yokohama, Japan, in the Annex Hall of the Pacifico Convention Complex. We are grateful to The Brain and Mind-Sports Foundation that they have offered to sponsor and organize five events in cooperation with the ICGA, viz. the 20th WCCC, the 4th WCSC, the 2013 World Computer Chess Blitz Championship, the Brain & Mind-Sports Computer Olympiad, and the 7th International Conference on Computers and Games (CG2013). Here we recall that the Maastricht Triennial Meeting in 2002, i.e., the first ICGA meeting (instead of 1CCA), decided that the WCCC should be held annually without distinguishing any type of machines. The observation was clear: all kinds of differences between microcomputers, personal computers, "normal" computers, and supercomputers were in some sense obsolete and the classification thus was considered artificial. So was the division into the classes of single processors and multiprocessors.
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