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Subject: Hashing, history and killers

Author: Alvaro Jose Povoa Cardoso

Date: 06:12:39 11/12/00


Could someone please explain where exactly we update the hash table, the history
table and the killers?

I have seen several chess program sources, and in some the update is done only
when Score>Alpha (a better move is found).
Others, like Crafty, update when Score>Alpha_and_Score>=Beta, in other words,
when a fail high occurs.
I'm cunfused.
What is the difference, between updating only when Score>Alpha and updating when
Score>=Beta (fail high) ?

Thank you

Alvaro Cardoso



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