![]() This very inexhaustibility has always attracted writers to chess. Unfortunately, to run through every possible 40-move chess game would still take as many years as there are electrons in the entire universe. A pretty impressive number-crunching network? Well, no. Now, just think of 80 such high-rise stacks snaking around the solar system. If these futuristic slabs of silicon were each just a centimetre thick, such a stack of them would reach two-thirds of the way from the Earth to the Sun. ![]() Now picture 10,000 billion such computers running the same program in parallel. To get an idea of the mind-boggling size of this number, imagine a supercomputer that can play through a million billion different chess games every second. ![]() The number of possible chess games that last exactly 40 moves, for instance, has been estimated as 25 x 10 115. ![]()
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