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Temporal difference is very much like backprop and may be used for many similar problems. Its claim to fame is the backgammon playing program by Tesauro although it can be used for other applications as well. The original article on this subject is by Rich Sutton. TD has been applied to games however this article says it could be applied to economic time series and other applications (has anyone seen any?). A thesis by Isbell considers its use in games.