Author: Matthias Gemuh
Date: 02:49:27 12/03/01
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You say : "Basically, if during the search you get a hashtable hit which tells you that this position is 0.5 pawns 'or more' advantage, you raise your alpha (alpha is the value that says: a move must be _better_ than this to become the new mainvariation) to 0.5 and prune away everything that is less. This is, AFAIK, theoretically sound. The only problem is that if the value of this branch was _exactly_ 0.5, you will also have pruned away your mainvariation." Why then adjust by 0.5? Why not 0.49? Does that still prune away the PV?
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