Author: Uri Blass
Date: 22:41:55 10/28/02
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On October 29, 2002 at 01:34:00, Pham Hong Nguyen wrote: >On October 29, 2002 at 00:34:41, Uri Blass wrote: > >>On October 28, 2002 at 20:28:43, Pham Hong Nguyen wrote: >> >>>Hi all, >>> >>>I read that someone suggests the margin between the evaluations and materials >>>should not excess 1.5 of pawn. However, my margin is 1.5 of ... queen and I >>>think that causes many problems for my program: difficult to apply razoring, >>>lazy eval, cut off in qsearch... >>> >>>So my questions here are: >>>- What is the margin of Crafty? >>>- Could you share some experiences about your margin and its >>>advances/disadvances? >>> >>>Many thanks for any answers. >> >>My margin is not defined because I did not define my values for material. >>It is possible to do a linear regression in order to guess the evaluation based >>on material but I did not do it. >> >>Pieces gwt different value on different squares that and I have not one value >>for the pieces. >>6 pawns in the 7th rank are usually evaluated as better than 8 pawns. >> >>If people tell you that the difference between evaluation and material should >>not excess 1.5 pawns then they tell you that you cannot give the right score for >>pawns in the 7th. >>It also means that you cannot evaluate unstoppable passed pawn in pawn endgames. >> >>Uri > >Uri, I understand your way to evaluate because my margin is also much larger >than 1.5 pawns. > >Just want to get some experiences about use of materials in some functions with >which I have problems. For example, I cannot use the values of 1.5-2 pawns for >razoring based on materials like many programs, I have to use value of rook, it >turns out I gain very little. > >Do you do any thing based on materials? such as lazy eval, razoring,...? No I have incremental evaluation so I do not need to do things based on materials. Uri
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