The evidence that diversifi cation is needed is signaled by the repetition of previously-visited confi guration.
All confi gurations found during the search are stored in the memory. After a move is executed one checks
whether the current confi guration has already been found in memory and reacts accordingly. The memory
storage and access is executed through hashing or tree techniques in a CPU time that is constant with respect
to the number of iterations (for non-trivial tasks the overhead caused by the use of memory is negligible).
The fi rst reactive mechanism is not suffi cient to guarantee that the search ...
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