Author: Dieter Buerssner
Date: 10:50:24 01/19/04
Go up one level in this thread
On January 19, 2004 at 08:44:41, Gabor Szots wrote: >I agree. This is the first time I am expleined what these signs after depth >mean, although I am not still uncertain about the negative sign (does it mean >upperbound, i.e. this is a move by which the score will not improve above what >is displayed?). Yes, the minus sign (in typical UCI-GUIs) means an upperbound. So, the engine is (pretty) sure that the actual score at this depth is not better than the displayed one. The score might be significantly worse. It will probably search again (with a more open window) at this same depth, to come up with a better score/PV. WB-engines have no "official" method to show, that a score is lowerbound or upperbound or exact. Under the WB-GUI itself some engines indicate such things by move! (for lowerbound), move? (for upperbound) or similar methods. WB itself will just display, what the engines says, it wants to have displayed as PV. Typical commercial GUIs want to interprete the PV (not only display the string sent from the engine, but for example reformat it with figurine notation, adding move numbers, etc.), so some unexpected characters like !, ?, +, - can easily confuse the GUI. Regards, Dieter
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