The Smartest Machines Are Playing Games

AI researchers are training their systems to master steadily more complex fantasy worlds.
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Artificial intelligence has come a long way in the 20 years since International Business Machines Corp.’s Deep Blue beat world champion Garry Kasparov in a six-game chess match, or even the six years since Watson trounced Ken Jennings on Jeopardy! Computers have beaten top human players at checkers, backgammon, poker, and go. Add to the list Super Smash Bros. Melee, a 2001 Nintendo Co. fighting game that lets you pit, say, Mario against Pikachu.

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