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Subject: Transpositions are driving me crazy !

Author: Oren Avraham

Date: 08:15:18 03/29/02


I've been tring to understand TT for a long time but with only little success !
I saw different algorithms that got me even more confused.

Generally I need a document that explains the TT interaction with the alpha-beta
(as detailed as possible)

moreover, i have some questions about TT usage and algorithm:

1) Do I use the values stored in the TT when i'm scanning with Iterative Deeping
? (example: values from depth 4 are not accurate (and even misleading) in depth
5 (and so on...)

2) How do i use the Upper/Lower Bounds and when.
    the lines :  if lowerbound >= beta return lowerbound
                 else break;

   confuse me - why this condition is checked - the values should be correct in
all the cases because a rescan will generate the same cutoffs ...

Thank you in advance - take it as a challenge (to explain as good as possible)
Oren Avraham.



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