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instead. However, a fully fledged search is typically full of [[Search Instability|search instability]], and it will often happen that the above re-search will fail low! This is why it is best to only widen the bound that fails, and leave the other bound unchanged.
Modern engines, like [[RobbolitoRobboLito]] or [[Stockfish]], start with a rather small aspiration window, and increase the bound that fails in an exponential fashion.
=PVS and Aspiration=
